How To Store Snowblower Outside - Mechanics tips

Storing a snowblower outside isn’t ideal, but I understand snow blowers are bulky and may not fit in a standard garage with the car.


I’m a mechanic and in my experience equipment stored outdoors costs more to maintain and doesn’t live as long. But there are some simple steps you can take to protect your snowblower.

To successfully store a snowblower outside, a gas stabilizer must be used to treat the fuel system and a breathable waterproof cover must be installed.

In this post you’ll learn a few mechanics tips for successful outdoor storage of your snowblower or any garden machinery.

Mower gas cap

Vented Gas Cap

Outdoor Storage Preparation

Depending on the climate in your area, your snowblower could be in for a rough time of it. Hail the size of tennis balls, driving rain, wind, snow and Ice, scorching sun… it’s a big ask, but properly prepped, your snowblower is up to the challenge.

Here’s a guide to the areas that will need attention:

Mower gas tank

Gas Stabilizer

Add Gas Stabilizer

Modern gas is blended and that is where many of the no start issues stem from. Blended gas also known as ethanol goes stale quickly in open to atmosphere type fuel systems (all small engine machinery).

Ethanol attracts moisture and being an open system, your snowblower allows moisture in and the gas to evaporate. This often results in gumming and corrosion inside the carburetor.

In addition to this time bomb, ethanol is damaging to the rubber and plastic components of the fuel system.

These problems can be prevented, the solution for both these issues is called gas stabilizer. It’s an additive for the fuel.

When mixed and added to the gas tank it will protect from carb contamination and the corrosive effects of ethanol.

You can check out the brand I use here on the “Snowblower tools page”.

Mower gas tank

Winged & Threaded caps

Engine Preparation

Ideally a snowblower should be serviced at least once a year and at the beginning of the new season. Many owners prefer to tune-up at the end of the season in readiness for the snow and that makes great sense.

Preparing a snowblower engine for long term storage is easy. The air filter should be removed and cleaned and oil level checked. In order to prevent internal engine corrosion we’ll need to place the engine at top dead center (TDC). It sounds complicated, it’s not.

The valves as you know open and close to allow gas in and exhaust gases out. When the engine comes to a rest after shutting down, it’s common for a valve to remain open.

This isn’t an issue in the short term, but over the longer term (and especially as we’re storing outside) corrosion can enter the cylinder through the open valve.

This rarely causes a major issue, however on occasion enough corrosion will form to cause the valve to stick open. This as mentioned earlier, causes a no start.

To prevent this we’ll add some oil to help prevent cylinder corrosion and we’ll place the engine at TDC. Doing so ensures both valves are closed.

Follow the steps below:

  • Remove spark plug
  • Add capful of engine oil to cylinder
  • Place non metallic blunt object inside the cylinder (pencil)
  • Turn over engine by hand until the pencil is pushed to the top of the cylinder (valves are now closed)
  • Refit the spark plug
Mower gas tank

Winged & Threaded caps

Use Breathable Cover

A good quality cover not only keeps the rain, sun and debris from damaging your snowblower, it also allows the snowblower to breathe, and that’s important.

Trapped moisture under the cover will damage the machine. It will cause the paint to flake, fasteners to corrode and electrical components such as the armature to fail prematurely.

A plastic sheet won’t help your machine, it traps moisture in and that’s almost as bad as the machine sitting in the rain. A good breathable cover will allow trapped moisture to escape through the material.

In addition to a cover, try and park the snowblower under some shelter. Check out the cover I recommend here on “The snowblower tools page”.

Mower gas tank

Winged & Threaded caps

Prepare The Body

At the end of the season wash the machine thoroughly and allow it to dry. When fully dry, apply a coat of Dupont Teflon coating or WD40. The coating helps guard against moisture and prevents dust and dirt sticking to the body and components.

Spray the machine from top to bottom, avoid belts though.

Vented mower gas caps

Vented gas caps

Remove The Battery

If your snowblower is battery start then the battery will need special attention. Batteries hate the cold, you know that but they also hate lying idle, that’s a battery killer.

To keep the battery in top condition it will need to be removed and stored where it can be connected to a smart charger.

The smart charger will charge the battery only when it needs a boost, they are low energy consumers and don’t cost a ton to buy. They will pay for themselves after one season. Smart chargers may be used on all 12 volt batteries, car, truck, RV, ATV, Dirt bike, boat, lawnmower.

Check out the smart charger I recommend here on the “Snowblowers tools page”.

Rodent Protection

Mice eat wiring insulation and as your machine is out in the elements it will be at risk. Bate placed around the machine will at least help prevent them from moving in and making a feast of your looms.


Auto Technician and Writer at Lawnmowerfixed | Website

John Cunningham is an Automotive Technician and writer on I've been a mechanic for over twenty years, I use my knowledge and experience to write "How to" articles that help fellow gear-heads with all aspects of mechanical repairs, from lawn mowers to classic cars.