How to Cover Outdoor Generators Safely During Winter Storage

As winter approaches, protecting outdoor generators from snow, freezing rain, moisture, and harsh weather becomes essential for maintaining their performance and extending their service life. Whether used for residential emergency backup power, construction projects, agricultural operations, or commercial applications, generators require proper storage to remain reliable throughout the colder months.

Using durable poly tarps and vinyl tarps can help protect generators from winter weather during storage. However, selecting the right covering material, preventing trapped moisture, and following proper generator safety procedures are equally important.

At Tarp Supply Inc.®, we understand the importance of protecting valuable outdoor equipment against seasonal weather conditions. Our selection of poly tarps and vinyl tarps provides practical covering options for equipment that must be stored outdoors.

In this guide, we explain how to cover outdoor generators safely during winter storage, choose appropriate tarp materials, prevent moisture damage, and prepare generators for reliable performance when they are needed again.

Why Outdoor Generators Need Protection During Winter Storage

Generators are valuable investments, particularly in regions where winter storms, heavy snowfall, and freezing temperatures can cause unexpected power outages.

When generators remain outdoors without adequate protection, prolonged exposure to harsh weather can affect their condition and performance.

1. Snow and Ice Accumulation

Snow and freezing precipitation can collect on exposed generator surfaces. As temperatures fluctuate, accumulated snow may melt and refreeze, allowing moisture to reach sensitive components.

Repeated freezing and thawing can contribute to deterioration of exposed materials, particularly when equipment remains unused for extended periods.

A properly secured weather-resistant generator storage cover can reduce direct exposure to snow and ice.

2. Moisture and Corrosion

Moisture is a major concern during winter generator storage.

When rain, melting snow, or condensation reaches metal components, corrosion may develop over time. Electrical connections, fasteners, and exposed surfaces may also be affected by persistent dampness.

Although waterproof tarps help block external precipitation, trapped moisture beneath an improperly installed tarp can create additional problems.

For this reason, effective winter protection requires both weather resistance and moisture management.

3. Windblown Debris and Dirt

Winter storms often bring strong winds that carry leaves, dust, branches, and other debris.

These materials can accumulate around generator housings, ventilation openings, and other exposed areas.

A securely installed protective covering helps reduce debris accumulation while the generator is stored and not operating.

4. Long-Term Outdoor Exposure

Generators that remain outdoors for several months may experience accelerated wear from fluctuating temperatures, sunlight, precipitation, and airborne contaminants.

Choosing an appropriate outdoor covering provides an additional protective layer and helps maintain cleaner equipment surfaces between maintenance inspections.

Choosing the Best Tarps for Outdoor Generator Winter Storage

Selecting a suitable tarp is one of the most important steps in protecting generators from harsh winter conditions.

At Tarp Supply Inc.®, we offer Poly Tarps and Vinyl Tarps suitable for various outdoor equipment protection applications.

However, tarp selection should always account for the generator manufacturer's storage instructions. Some manufacturers specifically warn against non-breathable plastic coverings because they can trap condensation.

Poly Tarps for Outdoor Generator Protection

Polyethylene tarps, commonly known as poly tarps, are popular for outdoor storage because they provide waterproof protection in a lightweight, flexible material.

They are suitable for many general-purpose covering applications, including equipment storage, construction materials, outdoor furniture, and machinery.

Benefits of Poly Tarps

• Waterproof Protection: Helps prevent rain and melting snow from directly reaching covered equipment.

• Lightweight Construction: Makes installation, removal, and seasonal adjustments convenient.

• UV Resistance: UV-treated options help resist deterioration from sunlight exposure.

• Reinforced Edges: Provide additional strength along tarp attachment points.

• Multiple Thickness Options: Allow customers to choose materials based on their storage conditions.

• Versatile Applications: Suitable for covering equipment, supplies, and outdoor storage structures.

For generator storage, a poly tarp is best used as an outer weather barrier over a separate storage shelter or protective frame, with provisions to prevent condensation from collecting around the generator.

We recommend avoiding direct, airtight wrapping of generators with polyethylene sheets, especially where the manufacturer's instructions discourage nonporous covers.

Vinyl Tarps for Heavy-Duty Winter Equipment Protection

For more demanding outdoor storage conditions, vinyl tarps offer another protective option.

Constructed from durable PVC-coated fabric, vinyl tarps are commonly used for industrial equipment, machinery, transportation, and long-term outdoor storage applications.

Their heavier construction can provide additional resistance to abrasion and demanding weather conditions.

Benefits of Vinyl Tarps

• Waterproof Material: Helps protect covered structures from snow, rain, and moisture.

• Heavy-Duty Construction: Suitable for demanding outdoor covering applications.

• Abrasion Resistance: Helps withstand friction associated with equipment covers and repeated handling.

• Weather Resistance: Provides reliable protection for outdoor storage structures.

• Reinforced Attachment Points: Allow secure installation using appropriate tie-down accessories.

• Long-Term Versatility: Useful for protecting machinery, construction supplies, and other equipment.

When used for generator protection, vinyl tarps should be installed over a suitable frame or storage enclosure rather than tightly wrapped around the generator.

Important: Neither ordinary Poly Tarps nor standard Vinyl Tarps should be used as operating covers for running generators. Both are intended here for equipment that is completely shut down and cooled.

Poly Tarps vs. Vinyl Tarps: Which Is Better for Winter Generator Storage?

Both materials can provide effective weather barriers when used as part of a properly designed storage arrangement.

For lightweight, seasonal protection, we recommend considering heavy-duty poly tarps.

For demanding storage environments where increased material durability is important, vinyl tarps may provide a more suitable exterior weather barrier.

The correct solution depends on storage duration, local weather conditions, generator dimensions, ventilation requirements, and manufacturer recommendations.

How to Cover an Outdoor Generator Safely During Winter Storage: Step-by-Step Guide

Proper generator storage requires more than simply placing a tarp over the equipment.

We recommend following these essential steps to protect the generator while reducing the risks associated with improper covering.

Step 1: Turn Off the Generator and Allow It to Cool

Before installing any protective covering, make sure the generator is completely shut down.

Disconnect connected equipment, follow the manufacturer's shutdown procedure, and allow the engine and exhaust system to cool completely.

Never place Poly Tarps, Vinyl Tarps, or other ordinary covers over a running or hot generator.

Generator engines and exhaust components can reach extremely high temperatures. Covering them before they cool creates a potential fire hazard.

Portable generators also produce carbon monoxide during operation. A tarp enclosure can trap exhaust gases and obstruct the airflow required for safe operation.

The U.S. Consumer Product Safety Commission emphasizes that portable generators must operate outdoors, at least 20 feet from homes and buildings, with exhaust directed away from doors, windows, and vents.

U.S. Consumer Product Safety Commission+1

Step 2: Clean the Generator Before Storage

Before covering the generator, inspect and clean its exterior surfaces.

Remove accumulated dirt, leaves, grass clippings, and loose debris.

Pay particular attention to accessible areas around the frame and housing.

Use a cleaning method approved by the generator manufacturer, and avoid directing pressurized water toward electrical connections, outlets, or sensitive components.

Allow the equipment to dry thoroughly before placing it into storage.

Storing a damp generator beneath a protective cover can encourage corrosion and moisture accumulation.

Step 3: Prepare the Fuel System and Battery

Winter storage preparation should include the generator's fuel system.

Gasoline can deteriorate during extended storage, potentially causing hard starting or fuel-system problems.

Depending on the generator model and anticipated storage period, the manufacturer may recommend draining gasoline, running the carburetor dry, or using an approved fuel stabilizer.

For example, Generac recommends draining fuel and running the carburetor dry when storing certain portable generators for more than 30 days.

Generac

We recommend checking the owner's manual for the correct procedure.

For electric-start generators, inspect the battery and follow the manufacturer's instructions for charging, disconnection, or battery-maintainer use.

Fuel must always be stored in approved containers and away from ignition sources.

Step 4: Select a Suitable Winter Storage Location

Choosing a proper storage location is equally important as selecting the tarp material.

Whenever practical, we recommend storing generators in a dry, secure, well-ventilated location approved by the manufacturer.

For equipment that must remain outdoors, select an area that is:

• Elevated above standing water and potential flooding.

• Protected from falling branches and accumulating debris.

• Away from roof edges where snow and ice may slide downward.

• Accessible for inspections and routine maintenance.

• Suitable for safely securing a weather-resistant storage shelter.

Position the generator on a stable, level surface.

Avoid low-lying locations where rainwater or melting snow may accumulate.

A weather-resistant platform or manufacturer-approved storage base can provide additional protection against ground moisture.

Step 5: Choose the Correct Tarp Size

Proper tarp sizing helps provide adequate coverage without creating excessive loose material.

Measure the generator's length, width, and height, and then determine the dimensions needed for the protective frame or shelter.

For example, if a generator measures approximately 30 inches long, 24 inches wide, and 25 inches high, the protective covering must account for the larger shelter dimensions rather than only the equipment itself.

We recommend choosing a tarp that provides sufficient coverage for the structure while allowing proper drainage and secure attachment.

An excessively oversized tarp may create loose sections that collect water or flap during strong winds.

A tarp that is too small may leave portions of the storage shelter exposed to precipitation.

Step 6: Install the Tarp Over a Protective Frame

For outdoor storage, we recommend using a separate, stable shelter frame to support the tarp.

The covering should create a weather barrier above and around the stored equipment without resting against sensitive components.

A suitable structure should:

• Support the weight of the tarp and anticipated precipitation.

• Provide a sloped roof to encourage rainwater and snowmelt runoff.

• Avoid direct contact between the tarp and generator components.

• Include drainage around the storage area.

• Minimize condensation through appropriate ventilation.

• Meet the generator manufacturer's storage requirements.

Avoid sealing the generator completely inside an ordinary waterproof tarp.

A tightly enclosed covering can restrict air circulation and allow humidity to accumulate.

The generator must remain shut down while beneath this storage covering. Remove the ordinary tarp before starting the generator.

Step 7: Secure the Tarp Against Winter Winds

Strong winter winds can lift unsecured tarps, loosen attachment points, and expose stored equipment.

To prevent these problems, use suitable tie-down accessories and the tarp's reinforced grommets.

Secure the tarp to the storage structure rather than tying it directly to delicate generator components.

We recommend checking that the covering is properly tensioned without placing excessive stress on the grommets.

Avoid sharp edges that may damage the tarp during repeated wind movement.

After heavy storms, inspect the covering for loosened attachments, tears, or accumulated snow.

How to Prevent Condensation Under Generator Storage Covers

Condensation is one of the most overlooked concerns when storing generators during winter.

Even when a tarp successfully prevents rain and snow from entering a storage area, moisture may develop beneath the cover as temperatures change.

When humid air contacts cold surfaces, water vapor can condense into droplets.

Over time, this moisture may contribute to rust and corrosion.

Why Airtight Generator Covers Can Cause Problems

Nonbreathable materials restrict moisture movement.

When they are wrapped tightly around stored equipment, humidity can remain trapped near metal surfaces.

Honda's generator storage guidance specifically cautions against using plastic sheets as dust covers because nonporous coverings can trap moisture and promote corrosion.

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To reduce condensation, we recommend choosing the storage arrangement according to the generator manufacturer's instructions.

A breathable, generator-approved cover may be preferable when the cover is in direct contact with the equipment.

For outdoor shelter applications, waterproof Poly or Vinyl Tarps can help block precipitation when installed as an exterior barrier over an appropriately ventilated structure.

Practical Ways to Reduce Moisture Accumulation

We recommend several preventive measures:

1. Clean and completely dry the generator before storage.

2. Avoid tightly wrapping the generator in waterproof plastic.

3. Use a storage shelter designed to prevent water accumulation.

4. Maintain adequate ventilation where permitted by the manufacturer.

5. Inspect the storage area periodically for signs of condensation.

6. Replace damaged coverings and correct drainage problems promptly.

These measures help preserve the generator's condition throughout extended winter storage.

Common Mistakes to Avoid When Covering Generators During Winter

Even durable tarp materials cannot compensate for unsafe storage practices.

Understanding common mistakes can help protect equipment while improving storage safety.

Using a Regular Tarp While the Generator Is Running

This is one of the most dangerous mistakes.

A regular tarp may obstruct airflow, trap exhaust gases, contact hot components, and create fire or carbon monoxide hazards.

Never operate a generator underneath an ordinary Poly Tarp or Vinyl Tarp.

For operation in rain or snow, follow the manufacturer's specific instructions for an approved running-weather shelter. Ordinary storage tarps are not substitutes for properly engineered generator operating enclosures.

Covering the Generator Before It Cools

Even after shutdown, generator engines and exhaust systems can remain hot.

Installing a tarp too early can cause material damage or ignition.

Allow the generator to cool completely before covering it.

Wrapping the Generator Too Tightly

A tightly wrapped waterproof tarp may create a moisture-trapping enclosure.

For direct equipment coverage, follow the generator manufacturer's cover recommendations rather than assuming that a waterproof tarp is appropriate.

Allowing Snow to Collect on the Tarp

Flat coverings may allow snow and ice to accumulate.

Excessive snow weight can damage the storage frame or cause the tarp to collapse.

We recommend a sloped, adequately supported shelter roof designed for local snow and wind conditions.

Ignoring Seasonal Inspections

Outdoor storage covers should be inspected regularly.

Check for tears, loose tie-downs, standing water, and excessive snow accumulation.

Confirm that the storage arrangement continues to protect the generator without creating new hazards.

Winter Generator Storage Checklist

Before leaving a generator in storage for an extended period, we recommend completing the following checklist:

[ ] Generator is fully shut down and completely cooled

[ ] Exterior surfaces are clean and dry

[ ] Fuel system prepared according to manufacturer instructions

[ ] Battery maintained or disconnected as directed

[ ] Generator is positioned on a stable, level surface

[ ] Storage location is protected from standing water

[ ] Covering arrangement follows manufacturer guidance

[ ] Poly or Vinyl Tarp is secured to a separate storage frame, if used

[ ] Storage shelter has appropriate drainage and ventilation

[ ] Generator will not be operated while covered

[ ] Periodic winter inspections are scheduled

How to Maintain Generator Protection Throughout Winter

Proper covering is only one part of a complete winter equipment protection strategy.

Regular inspections and preventive maintenance are essential for keeping generators in good condition.

Inspect the Storage Cover After Severe Weather

Winter storms can loosen tie-downs, damage tarp materials, and cause snow accumulation.

After significant snowfall or strong winds, inspect the storage structure when conditions are safe.

Remove accumulated snow where necessary without damaging the covering or placing yourself beneath unstable structures.

Replace worn or damaged tarp materials before additional weather exposure occurs.

Monitor for Rust and Moisture

Periodically check the generator and storage area for visible condensation or corrosion.

If moisture is present, identify and correct the underlying problem.

This may require improving drainage, adjusting the shelter, or using a different manufacturer-approved covering.

Follow the Recommended Maintenance Schedule

Generators require maintenance even when used infrequently.

Follow the owner's manual for oil changes, fuel-system preparation, battery care, inspections, and other scheduled maintenance.

Avoid starting a stored generator inside its storage enclosure.

If periodic operation is recommended, move the unit to an approved outdoor operating location and follow all applicable safety instructions.

Why Choose Tarp Supply Inc.® for Outdoor Equipment Protection?

At Tarp Supply Inc.®, we provide durable covering solutions for homeowners, contractors, agricultural operators, and businesses that need dependable protection for outdoor equipment and materials.

Our selection includes Poly Tarps and Vinyl Tarps designed for a wide range of covering applications.

Whether protecting construction supplies, outdoor machinery, stored materials, or equipment shelters, we offer options to suit different environmental conditions and durability requirements.

Our Poly Tarps

Our Poly Tarps provide versatile waterproof material for general outdoor covering needs.

Available in different sizes, thicknesses, and colors, these tarps offer practical options for seasonal weather protection.

Features vary by product but may include UV treatment, rope-reinforced hems, reinforced corners, and corrosion-resistant grommets.

Our Vinyl Tarps

Our Vinyl Tarps are designed for demanding applications that require durable, waterproof covering materials.

Their heavy-duty construction makes them suitable for industrial storage, equipment shelters, machinery protection, and other outdoor applications.

When choosing materials for generator storage, we recommend using these tarps as part of a properly designed weather-protection structure and following the generator manufacturer's specific storage instructions.

Protect Your Outdoor Generator With the Right Winter Storage Solution

Preparing an outdoor generator for winter storage helps preserve its condition, reduce unnecessary weather exposure, and support reliable performance when backup power is needed.

A successful storage strategy combines proper generator maintenance, moisture prevention, secure weather protection, and safe covering practices.

Heavy-Duty Poly Tarps and Vinyl Tarps provide practical options for protecting outdoor storage shelters against snow, rain, windblown debris, and changing weather conditions.

At Tarp Supply Inc.®, we offer a wide selection of waterproof tarps for protecting outdoor equipment, machinery, construction materials, and seasonal storage areas.

When covering a stored generator, always follow the manufacturer's recommendations and avoid operating the equipment beneath ordinary tarps.

Shop Heavy-Duty Poly Tarps and Vinyl Tarps at Tarp Supply Inc.®

Protect your valuable outdoor equipment before the next winter storm arrives.

Explore our durable Poly Tarps and Vinyl Tarps to find reliable weather-resistant materials for your outdoor equipment storage shelters.

Whether you need lightweight waterproof coverage or heavy-duty protection for demanding environments, we offer tarp solutions designed for a variety of seasonal storage applications.

Shop Tarp Supply Inc.® today and prepare your outdoor equipment storage areas for winter with dependable Poly Tarps and Vinyl Tarps!

Frequently Asked Questions About Covering Outdoor Generators During Winter

1. Can You Cover an Outdoor Generator With a Tarp During Winter?

Yes, a tarp can be used to protect a generator's outdoor storage area from snow and rain when the generator is completely shut down and cooled.

However, not every generator manufacturer permits a non-breathable tarp directly over the equipment. We recommend using a manufacturer-approved generator cover or a suitable external storage shelter.

2. What Is the Best Tarp for Outdoor Generator Winter Storage?

Heavy-Duty Poly Tarps and Vinyl Tarps can provide waterproof barriers for outdoor storage shelters.

Poly Tarps are lightweight and easy to handle, while Vinyl Tarps offer heavier construction for demanding applications.

For direct contact with the generator, choose a cover approved by its manufacturer rather than automatically selecting a waterproof tarp.

3. Can You Run a Generator While It Is Covered With a Poly Tarp or Vinyl Tarp?

No. Never run a generator under an ordinary Poly Tarp or Vinyl Tarp.

These materials can obstruct cooling airflow, trap dangerous exhaust gases, and create fire hazards.

Generators should operate only in accordance with manufacturer instructions, using an approved weather-protection system when necessary.

4. How Do You Keep Snow Off an Outdoor Generator?

We recommend protecting a stored generator with an appropriately designed shelter featuring a sloped, weather-resistant roof.

A properly installed Poly or Vinyl Tarp can serve as an exterior covering for the shelter.

The structure should be engineered to handle expected snow loads and maintain suitable drainage.

5. Will a Waterproof Tarp Prevent Generator Rust?

A waterproof tarp can reduce direct exposure to rain and melting snow, but it cannot guarantee rust prevention.

If moisture becomes trapped underneath the covering, corrosion may still develop.

Proper ventilation, dry storage conditions, and manufacturer-approved coverings are essential.

6. Should You Remove Gasoline Before Storing a Generator for Winter?

Fuel preparation depends on the generator model and storage duration.

Some manufacturers recommend draining gasoline during extended storage, while others provide procedures involving approved fuel stabilizers.

Always follow the owner's manual and store fuel safely in approved containers.

7. How Long Can a Generator Be Stored Outdoors?

The appropriate storage duration depends on its design, maintenance requirements, and exposure conditions.

Some generators can be stored outdoors with suitable protection, while others may require sheltered or indoor storage.

We recommend consulting the manufacturer's documentation and inspecting stored equipment periodically.

8. Are Vinyl Tarps Better Than Poly Tarps for Long-Term Outdoor Storage?

Vinyl Tarps generally offer heavier construction and strong abrasion resistance, making them useful for demanding outdoor applications.

Poly Tarps are often easier to handle and provide versatile waterproof protection.

For generator storage, the best choice depends on the covering structure, exposure conditions, and the generator manufacturer's recommendations.

9. How Do You Secure a Generator Storage Tarp Against Strong Winter Winds?

Use a properly designed frame and suitable tie-down accessories.

Attach the tarp through its reinforced grommets and secure it to stable structural points.

Avoid fastening the tarp directly to sensitive generator components.

Inspect the covering after severe weather and adjust loose attachments as necessary.

10. Can a Generator Be Left Outside During Freezing Temperatures?

Some generators are designed to tolerate cold-weather storage, provided they are maintained correctly.

However, freezing temperatures may affect batteries, fuel systems, and other components.

Follow manufacturer instructions for winterization, cold-weather maintenance, and storage conditions.

11. Do Generator Storage Covers Need Ventilation?

Ventilation requirements depend on the storage arrangement and the generator manufacturer's instructions.

A nonbreathable cover may trap condensation, while an appropriately designed storage shelter can provide protection against precipitation without sealing moisture around the equipment.

Ventilation does not make an enclosed area safe for operating a generator.

12. How Often Should You Inspect a Generator During Winter Storage?

We recommend checking the generator and protective covering periodically and after significant winter storms.

Look for loose attachments, moisture accumulation, corrosion, damaged tarp material, and drainage problems.

Follow the manufacturer's maintenance schedule for additional equipment inspections.