Equipment that has sat unused through a Canadian winter — or one that spent a full mowing season in service — rarely starts reliably without some attention. A modest investment of time in spring and again in autumn reduces the chance of a non-starting mower on the first warm day or a snow blower that fails in the first November storm.

The checklist below covers two transition points: the spring startup (preparing equipment for the mowing season) and the autumn shutdown (preparing equipment for winter storage). Not every item applies to every homeowner — skip sections for equipment types you do not own.

Spring Mower Preparation

Whether the mower is a gas walk-behind, a riding unit, or a battery-electric model, spring preparation follows a consistent structure: inspect, clean, check consumables, and verify that all systems operate before the first cut.

Gas Mower — Spring Checklist

  • Remove and inspect the spark plug. A plug that is heavily fouled or shows electrode wear should be replaced rather than cleaned. Most small engine spark plugs cost under $10 and are a reliable maintenance item. Gap the replacement to the manufacturer specification (typically 0.76 mm).
  • Check the air filter. Foam or paper filters should be replaced if visibly clogged or if it has been two or more seasons since last replacement. A restricted air filter reduces engine performance and increases fuel consumption.
  • Inspect the oil level. If oil was changed in autumn before storage, check only the level. If oil was not changed at shutdown, change it now. For most 4-stroke small engines, the recommended grade is 10W-30, but confirm with the specific engine manual.
  • Check the fuel. If gasoline was left in the tank through winter without a stabiliser, drain it and refill with fresh fuel. Ethanol-blended gasoline (E10, sold at most Canadian pumps) degrades noticeably within 30 to 60 days, forming gum deposits that partially block carburettor jets.
  • Clean the deck underside. Compacted grass clippings from the previous season restrict airflow and reduce cutting efficiency. Scrape the deck clean with a wood or plastic tool; avoid steel implements that can damage the coating.
If the mower sat all winter with untreated fuel in the carburettor, the most common starting problem is a partially blocked main jet. Carburettor cleaner spray and a few minutes with a fine wire or jet cleaning tool typically resolves this without a full carburettor replacement.

Blade Sharpening

Mower blade sharpness has a direct effect on grass health. A sharp blade cuts grass cleanly; a dull blade tears and shreds the blade tip, leaving a ragged edge that browns, creates entry points for disease, and increases water loss. The difference is visible when you inspect a freshly-cut grass blade at close range.

A typical residential lawn mower blade should be sharpened at least once per season — at spring startup — and checked again mid-season. If you mow over gravel, stones, or hard debris, sharpen more frequently.

Sharpening Process

  • Disconnect the spark plug wire before removing the blade.
  • Remove the blade using a wrench on the centre bolt. Note which face is down (the cutting edge faces up when the mower is running; the bevelled edge must face down toward the grass).
  • Use a file, bench grinder, or angle grinder to restore the cutting edge to approximately 30 to 45 degrees. Follow the original bevel angle.
  • Check balance: hang the blade on a nail through the centre hole. It should hang level. If one side drops, remove a small amount of material from the heavy side. An unbalanced blade causes excessive vibration that accelerates bearing wear.
  • Reinstall with the correct orientation; torque the centre bolt to specification.
Walk-behind lawn mower on a grass surface
Walk-behind mowers with a single blade require sharpening at least once per season for clean cuts.

Fuel System Notes

Most Canadian retailers sell gasoline blended with up to 10% ethanol (E10). Some stations sell E15 or higher. Ethanol content affects small engine maintenance in several ways:

  • Ethanol attracts moisture from the air. In equipment stored over winter, absorbed moisture accelerates fuel degradation and can cause carburettor and fuel line corrosion.
  • Rubber fuel lines and primer bulbs can swell or crack with prolonged ethanol exposure. Inspect these parts annually and replace if brittle or cracked.
  • Fuel stabiliser (such as products containing 2,6-di-tert-butyl-p-cresol or similar antioxidants) added at the end of the season slows degradation. Run the engine briefly after adding stabiliser so it reaches the carburettor.

If buying premixed fuel (sold in cans at hardware stores), look for ethanol-free formulas rated for small engines. These cost more per litre but eliminate the ethanol-related storage problems for equipment that sits unused for months.

Battery-Electric Equipment

Battery-electric mowers, string trimmers, and blowers have different winter storage requirements than gas equipment — notably, they have no carburettor to worry about, but batteries require specific care to retain capacity.

  • Store lithium-ion batteries at approximately 40–60% charge for extended periods. A fully charged battery held at near-zero temperatures for months degrades faster than one stored at partial charge.
  • Keep batteries in a temperature-controlled environment. A heated garage or basement is appropriate; an unheated shed that reaches -30°C in a Prairie winter is not suitable for lithium-ion storage.
  • Inspect battery contacts and the charger connection annually. Corrosion on the terminal contacts causes charging inefficiency and can produce heat.
  • If a battery no longer holds charge adequately, check the manufacturer's warranty — many lithium-ion battery packs for outdoor equipment carry two to three year warranties that cover significant capacity loss.

Snow Blower Spring Shutdown

The snow blower season typically ends between March and April depending on location. At shutdown:

  • Run the fuel tank and carburettor dry, or add fuel stabiliser and run the engine briefly to treat the carburettor. Leaving untreated gasoline in a snow blower carburettor through the warm months causes the same gumming problems as leaving it in a mower.
  • Inspect the auger paddles (on single-stage units) or the impeller on two-stage machines. Rubber auger paddles crack over time and should be replaced when visibly deteriorated.
  • Check and lubricate the auger shaft, impeller shaft, and chute rotation mechanism. Most snow blower manufacturers specify a light lithium grease for these points.
  • Inspect the shear pins on two-stage machines. Keep two or three spares on hand; a damaged shear pin is the most common reason a snow blower auger stops turning.

Autumn Equipment Shutdown

Gas Mower

  • Complete the final mow of the season and clean the deck thoroughly.
  • Change the engine oil while it is warm from the final run.
  • Sharpen or replace the blade for spring (so it's ready to go).
  • Drain the fuel tank completely or add a measured dose of fuel stabiliser and run the engine for several minutes.
  • Remove and inspect the spark plug; coat the threads lightly with anti-seize and reinstall hand-tight.
  • Store in a dry location; a breathable cover reduces dust without trapping moisture.

Snow Blower Startup Check (October)

  • Fill with fresh, stabilised fuel before first use.
  • Check that the engine oil level is correct.
  • Verify that the chute rotates fully and the deflector adjusts properly.
  • Test-run the machine before the first snowfall of the season to identify any issues while there is still time to address them.
  • Inspect the electric starter (if equipped) and the power cord connection.

Hand Tools and Storage

Hand tools — rakes, spades, edgers, hoes — are the most frequently neglected items in yard maintenance, which results in shortened service life and unnecessary replacements.

  • Clean soil from metal surfaces before storage. Dried soil traps moisture against the metal and accelerates rust.
  • Apply a light coat of oil (linseed oil on wooden handles, light machine oil on metal heads) before winter storage.
  • Hang tools rather than storing them horizontally on the floor; standing water and soil contact accelerates handle rot.
  • Inspect wooden handles for cracks or splintering in spring. A cracked handle on a spade or fork under load can fail suddenly; replacement is straightforward and inexpensive.

For the full-season context around when to schedule spring equipment checks in relation to lawn tasks, see the seasonal lawn care calendar. For information on autumn leaf and thatch management before putting equipment away, the snow mould prevention guide covers the connection between late-season lawn care and winter disease.