How to Winterize Your Grill and Smoker (And What Rusts If You Don't)

Grills do not die of cold. They die of a wet autumn's grease, a cover that traps condensation, pellets that drank humidity all January, and a spider that found the burner tube in March. Winterizing is one honest afternoon that prevents all of it — and it is the same afternoon whether you are shutting down for the season or just battening down between winter cooks. Here is the full procedure by grill type, plus the spring reopening that finishes the job.

Step One for Every Grill: The Final Clean

Everything left in the grill overwinters against bare steel, so the season's last clean is the one that matters most.

1. Run it hot 10–15 minutes to carbonize residue, then shut down and let it cool to warm.
2. Grates out and scrubbed — hot-scrape, wash, dry completely, then wipe cast iron or steel grates with a thin coat of high-heat cooking oil. Porcelain grates get washed and dried, no oil needed.
3. Degrease the interior. Drip trays, grease chutes, and the bucket get emptied and washed. Scrape the barrel or firebox walls' loose carbon. Grease is winter's chief accomplice: it holds moisture against steel and feeds next spring's first flare-up.
4. Dry everything. An hour open in the sun or a towel-down. Sealing damp steel under a cover is how rust gets its winter lease.

Gas Grills

• Burners: brush the ports, then cover each burner-tube opening with foil or the manufacturer's caps — this is the anti-spider measure, and it is not optional folklore; nested venturis are the number-one spring service call.
• Propane: valve closed, tank disconnected, regulator hose coiled inside the cart. The tank winters outside — upright, capped, off the ground, never indoors, never in the garage.
• Natural gas models: close the supply valve at the line and cap the quick-connect.
• Ignition: pull AA/AAA igniter batteries; they corrode in the cold and eat the module.

Pellet Grills

• Empty the fuel system completely. Run the grill until hopper and auger tube are bare, or vacuum both out. Pellets left through winter absorb moisture, swell, and set like concrete in the auger — the defining spring failure of the category.
• Vacuum the firepot and barrel of all ash; ash is hygroscopic and pins moisture against the firepot welds all winter.
• Electronics: if the grill winters outdoors in serious weather, pulling the controller inside is cheap insurance on models where it unplugs easily.
• Pellet stock moves to sealed containers indoors — the full storage discipline is in our pellet maintenance guide.

Charcoal Grills, Kamados, and Drums

• Ash out, completely. Damp ash forms a corrosive paste that eats kettle bowls and drum floors faster than anything else on this list. Empty the ash catcher, brush the bowl, done.
• Kamados: leave the ceramic's vents cracked slightly under the cover so interior moisture can escape; check the felt gaskets now and order replacements in the cheap season.
• Charcoal stock stores sealed and dry indoors — damp briquettes light badly forever after.

Storage Placement

Ranked: garage or shed (minus propane) beats covered patio beats open yard. Wherever it lands, get the grill off soggy ground onto pavers or a mat, point the lid seam away from prevailing weather, and — if it winters outside — lift the cover on a dry day each month to let it breathe and evict anything that moved in. Cold-climate cooks who grill year-round can skip full shutdown and instead run this article as a monthly mini-service; a maintained grill cooks happily at ten below.

The Spring Reopening (10 Minutes That Catch Everything)

1. Cover off, full visual: rust blooms, chewed wires, nests.
2. Gas: foil off the burner tubes, ports checked clear, hose inspected for cracking, then a soapy-water leak test on every connection after the tank hooks up — bubbles mean tighten or replace, no exceptions.
3. Pellet: confirm the auger spins free and the firepot is clear, then run a startup cycle empty before loading fresh pellets.
4. Charcoal: vents move freely, gaskets intact.
5. Burn-in 15 minutes hot before the first food of the year.

That is the whole discipline: last clean, dry fuel handled, moisture given an exit, and one look in spring. Do it each November and the grill that greets you in March is the one you put away — not a project. For the deep-clean techniques referenced throughout, the full cleaning guide has the step-by-step.

The Mid-Winter Check (Five Minutes a Month)

Winterizing is not fire-and-forget if the grill lives outdoors. Once a month on a dry day, lift the cover and look: condensation beading inside means the vents are blocked or the cover went on damp — dry it out and re-seat it. Check that wind has not worked the cover loose at a corner (a flapping edge sandblasts paint all season), confirm the cover has not become a leaf dam or a snow load past what its seams enjoy, and glance for animal signs — mice adore a covered grill cabinet, and evicting a nest in January beats discovering a chewed igniter wire in April. Sixty seconds of this per month is the cheapest extended warranty a grill can get, and it keeps the spring reopening down to its promised ten minutes.

File this whole checklist with the November calendar reminder, and winterizing becomes a rhythm instead of a rescue: one afternoon down, five minutes a month through the cold, ten minutes in spring. The grill pays it all back in seasons.