When winter rolls in, most of us think about snow shovels, heating bills, and whether the first storm will knock out the power. What often gets overlooked? The tools and equipment we depend on when things go sideways—your power tools and, especially, your generator.
Cold weather, moisture, and long periods of inactivity are rough on equipment. A little prep now can save you a lot of frustration (and money) when spring comes—or when the lights go out in January. Let’s walk through what you actually need to know about winterizing and maintaining your power tools and generator, without overcomplicating it.
Why Winterization Matters More Than You Think
Winter doesn’t just “pause” wear and tear. It actively creates problems:
- Condensation leads to rust and corrosion
- Cold temperatures break down batteries and seals
- Old fuel gums up carburetors
- Rodents look for warm places to nest (yes, inside engines)
Ignoring winter prep can mean tools that won’t start, batteries that won’t hold a charge, and expensive repairs that were completely avoidable.
Step 1 – Deep Cleaning and Surface Prep
Power Tool Exterior Care
Before storing anything, clean it. This sounds basic, but it’s huge.
- Blow out vents and crevices with compressed air
- Wipe down metal surfaces of your STIHL power tools and other power tools to remove dust and moisture
- Remove sawdust or debris trapped around motors and switches
- Dirt holds moisture, and moisture causes corrosion. Clean tools last longer—full stop.
Generator Exterior Care
If you’re going to store it, you want it clean before it sits for months.
- Remove dirt, grass, oil residue, and leaves from the frame.
- Make sure cooling vents and exhaust ports are clear.
- Check for oil or fuel leaks while you’re at it.
Step 2 – Engine and Fuel System Maintenance
Generator Fuel Strategies
If generators fail after winter, nine times out of ten, it’s fuel-related.
- Option 1 – Use Fuel Stabilizer: If you plan to store your generator with fuel in it, add fuel stabilizer to fresh gasoline. Run the generator for 10–15 minutes so treated fuel reaches the carburetor. This keeps gas from breaking down and clogging jets.
- Option 2 – Drain the Fuel (Often Better): For long-term storage, no fuel = nothing to gum up. Shut off the fuel valve and run the generator until it shuts down. Drain the carburetor bowl if accessible.
⚠️ Pro tip: Ethanol-blended gas attracts moisture. If you can use ethanol-free fuel for generators, do it.
Change the Oil (Yes, Even If You “Barely Used It”)
Used oil contains acids and contaminants that can damage internal engine parts over time. Fresh oil coats internal parts and protects them while the generator sits.
- Change generator oil before winter storage
- Replace the oil filter if your model has one
- Check your owner’s manual for correct viscosity (cold weather matters)
- If your machine needs a professional tune-up, visit our shop for power equipment service and repair.
Step 3 – Battery Care: Small Thing, Big Headaches
Many generators and cordless tools live or die by their batteries. Avoid leaving batteries in cold garages all winter. Cold kills lithium-ion capacity over time. A dead battery during a blackout is a special kind of misery.
Cordless Power Tools
- Remove batteries from tools before storage
- Store batteries indoors, somewhere dry and above freezing
- Aim for about 40–60% charge—not full, not dead
Generator Electric Start Batteries
- Disconnect the battery if storing long-term
- Use a battery tender or trickle charger
- Check terminals for corrosion and clean if needed
Visit Battery University to learn more about how cold temperatures affect battery longevity.
Step 4 – Protect Against Moisture and Rust
Cold + humidity = rust. Concrete wicks moisture—wood shelving or rubber mats help.
For Power Tools
- Lightly oil exposed metal parts (chucks, blades, tables)
- Use rust-inhibitor spray or paste wax on cast iron surfaces
- Store tools off concrete floors if possible
For Generators
- Store in a dry, well-ventilated area
- Use a breathable generator cover (not a tarp)
- Avoid sealing it in plastic—trapped moisture causes corrosion
Step 5 – Rodent Prevention (Don’t Skip This)
Mice and chipmunks love warm engines and wiring insulation. Rodent damage can be shockingly expensive—and hard to spot until it’s too late. Because of this, effective rodent prevention is a key part of winterizing your outdoor spaces.
- Block openings with steel wool or mesh (where appropriate)
- Use peppermint oil or rodent deterrents nearby
- Check air filters and exhaust areas before first use.
Step 6 – Inspect Belts, Cords, and Hoses
Winter is a great time for a slow, careful inspection. Cold weather makes rubber less forgiving. If something looks questionable now, it won’t improve later. Look for these red flags when winterizing and maintaining your power tools.
- Look for cracked cords or frayed insulation
- Check fuel lines and hoses for brittleness
- Inspect belts for cracks or glazing
Step 7 – Run Equipment Periodically (If Stored Long-Term)
For generators especially: This keeps seals lubricated and prevents components from seizing.
- Run it every 1–2 months if possible
- Let it warm up fully
- Put it under light load for 10–15 minutes
Step 8 – Store Smart, Not Just “Out of the Way”
Where you store things matters. Avoid unheated sheds with leaky roofs or basements with high humidity unless you’re using a dehumidifier.
Ideal storage conditions:
- Temperature-stable
- Good airflow
- Away from direct ground contact
- Dry
Step 9 – Before You Need It: Do a Pre-Winter Test Run
This one’s key—especially for generators. You don’t want your first test to happen at 2 a.m. during a power outage.
- Start it before winter storms arrive
- Plug something in to confirm output
- Listen for odd noises or surging
- Check breakers and outlets
- Proper testing ensures you have the essential tools for winter storms ready to go.
Winterizing and Maintaining your Power Tools: A Little Effort, A Lot of Payoff
Winterizing and maintaining your power tools and generator isn’t glamorous, but it’s one of those tasks where an hour or two now saves days of aggravation later. Clean equipment, fresh oil, stable fuel, healthy batteries, and smart storage go a long way. When spring hits—or when the power goes out and your neighbors’ generators won’t start—you’ll be glad you took the time.