How to Winterize an Outdoor Kitchen and Built-In Grill (2026 Checklist)

An outdoor kitchen is a set of appliances, plumbing, gas and stainless steel all left outside for the one season that tries to break each of them. Most winter damage comes from three things: water that freezes in a line, moisture trapped under a cover, and grease and crumbs left to rot. All three are cheap to prevent in one weekend and expensive to repair in April.

This checklist is ordered the way you should work. It is general guidance for a typical island with a built-in grill and, if you have them, a sink, fridge and pizza oven. Your manuals come first. Where a step involves gas or pressurized plumbing, the safe answer is a licensed professional, and we say so in each place. If you are still planning a build rather than closing one down, our outdoor kitchen cost breakdown and ventilation guide cover the other side.

The checklist at a glance

1. Deep clean first

Clean before anything else, because every other step is easier on a clean island and the dirt does its damage while you are not looking.

• Grates and flavor bars or heat tents: Burn off residue, brush, and wash per your manual. Leftover grease can go rancid and attract rodents.
• Burners and burner tubes: Check the ports for debris and spider webs. Insects nesting in a burner tube is a known cause of poor flames in spring.
• Drip tray and grease cup: Empty and wash. This is the single most common thing people leave full.
• Interior of the grill: Scrape the lid and firebox. Do not let grease pool.
• Island drawers, doors and cabinets: Empty all food, towels, paper goods, spices and anything a rodent would nest in or chew. Leave doors slightly open if your island has no vents.
• Countertops: Wash and dry. Seal natural stone or concrete only if your maker recommends it.

Use soap and water on stainless, not steel wool or chloride cleaners. Our 304 vs 430 stainless guide explains why those can damage the finish.

2. Gas: shut it off, and call a pro for pipe work

Gas is the step where caution matters most. The principle is simple: when the grill is not in use, the gas should be off, and any work on gas piping belongs to a licensed fitter.

If your grill runs on propane:

• Close the cylinder valve, then disconnect the cylinder.
• Never store a propane cylinder indoors, and that includes a garage, basement, shed attached to the house or any enclosed space. Keep it outdoors, upright, in a shaded and ventilated location away from the house, ignition sources and heat. Do not lay it on its side.
• Do not leave a cylinder connected to a covered grill for months.
• After you have shut the supply, follow your grill’s manual for what to do with the gas left in the hose and regulator. Many manuals have you run the burner until the flame goes out, then turn every knob off. Your manual wins over our summary.

If your grill is on natural gas:

• Close the supply valve to the island. Know where it is, and label it.
• Do not disconnect hard-piped fittings yourself. Disassembling, capping or relocating gas pipe is work for a licensed gas fitter, and local code usually requires it.
• If you do not know whether the line has a shut-off valve at the island, have a fitter add one rather than guessing.

Fuel type matters here too, because shutdown differs between them. Most built-in heads are sold as separate propane and natural gas versions. The Napoleon Prestige 500 Built-In lists “propane or natural gas” as separate versions in our data, so confirm which one is on your island before you start. Our natural gas vs propane guide walks through the difference.

Close the lid and wipe the control knobs. Then make sure every knob is in the off position before you cover it.

3. Water: drain it, don’t hope

If your island has a sink, a hose bib, a pot filler or a water line to an ice maker, water is the part that can cost real money. Water expands as it freezes and can split a pipe, fitting or faucet, and the damage is often hidden until you turn the water back on in spring.

The order that works:

1. Shut off the supply to the outdoor kitchen at its own valve, ideally one inside the heated part of the house.
2. Open the outdoor faucet and let the line drain. Open any low drain or bleed point your plumber installed.
3. Drain what you can by gravity. Lines should slope toward a drain point. If the installer did not give you one, add a drain valve at the low point.
4. Optional: blow out the lines with compressed air - only if every maker on the line allows it. This is where people get hurt or break things, so check first: the winterization instructions for the faucet, any inline filter and any ice maker each govern, and some appliance makers forbid compressed air on their valves and specify their own drain procedure instead. If any of them forbids it, or you cannot find the instructions, follow the manufacturer’s own procedure or hire a plumber. Where compressed air is permitted, use a regulator, keep the pressure low and never exceed the lowest rating on the line. If you are not sure, hire a plumber, who may blow out the lines in a few minutes.
5. Leave the faucet open over winter so any remaining water has somewhere to go.

The sink and the P-trap

The curved P-trap under a sink holds water by design, and that water can freeze and crack the trap.

• Remove as much water as you can, then pour RV (propylene glycol) antifreeze into the trap so the water is replaced.
• Use only RV or plumbing antifreeze labeled for that purpose. Never use automotive antifreeze, which contains toxic ethylene glycol.
• If your outdoor sink drains to a household system, check your local rules and the maker’s instructions on what may go down it.
• Remove and store any detachable hoses, sprayers and filters indoors.

4. The fridge, ice maker and other appliances

Plugged-in appliances are their own category. Most “outdoor-rated” refrigerators and ice makers are designed for warm weather and have a minimum operating temperature in the manual. Below that, they may not cool properly or may be damaged.

• Empty it and unplug it, unless your manual says it is designed to run in the cold.
• Drain the water line and the ice maker’s reservoir. Standing water inside an ice maker freezes and breaks parts.
• Defrost and dry the interior, then prop the door open so it does not grow mold.
• Pull the batteries from any thermometers, remotes or igniters if the manual allows.

Do not touch outdoor wiring. If a GFCI keeps tripping or a conduit looks damaged, a licensed electrician should look at it.

5. Protect the stainless

Stainless is tough, but it likes to be dry and clean. Wash the doors, drawers, hinges and the grill body, rinse, and dry them. Then:

• Keep iron and aluminum off it. Steel wool, a steel brush or leaving a cast iron pan on a damp surface can leave marks. The maker may recommend a protective product, so follow their instructions.
• Check the seals and gaskets on doors and drawers. Replace cracked ones before winter.
• Coastal or poolside islands deserve extra care, because salt and chlorine are the real enemy here and a winter under a wet cover makes it worse. The grade matters there, and our 304 vs 430 guide explains why.

The Blaze Premium LTE 32 lists 304 stainless throughout and a lifetime body warranty (wear parts have shorter terms) in our data, which makes it forgiving of a hard winter. That does not replace the cleaning. A warranty for the body does not cover neglect of the parts around it.

6. Pizza ovens: bring them in, or cover them well

A portable pizza oven is the easiest part of the kitchen to protect, because you can move it.

• Let it cool completely. A pizza oven holds heat for a long time. Do not cover or move it warm.
• Brush out the stone and the chamber. Remove ash from a wood or charcoal oven. Ash holds moisture and corrodes metal.
• Disconnect the propane cylinder on a gas oven and store the cylinder outside, as above. Never take it indoors.
• Store the oven indoors if you can. In our data the Ooni Koda 16 weighs 40 lb and runs on propane, and the Gozney Roccbox weighs 44 lb. Both can be carried by one person into a dry garage or shed, while the cylinder stays outside.
• Heavier ovens stay out. The Gozney Dome S1 is 58 lb and our data says it “lives where you put it,” and the Koda 2 Max is 95 lb. Use a fitted cover, keep them dry and check your maker’s guidance on winter storage.

Our pizza oven fuel guide and Ooni vs Gozney comparison help if you are replacing an oven rather than storing one.

7. Covers and ventilation

Covers are where well-meaning owners cause the damage they were trying to avoid.

• Use a breathable, fitted cover made for grills or outdoor furniture. A solid plastic tarp sealed to the ground traps condensation and can make rust and mildew worse than leaving the island bare.
• Cover the grill head and the whole island if you can, or at least the appliances, and leave a gap for air at the bottom.
• Keep island vents open. A built-in island should have vents to prevent gas from collecting and to let moisture out. Do not block them with a cover, and our island clearances and venting guide explains why they matter.
• Shake off snow from covers and flat surfaces so water does not pool.

8. Check it mid-winter

Look under the cover once in January, or after a thaw, for pests, damp, rust spots and pooled water.

Spring startup: leak test before you cook

When the weather turns, reverse the process in this order:

1. Remove covers and look for pest nests, especially in burner tubes and under the grill.
2. Reconnect the cylinder or reopen the natural gas valve with all burners off.
3. Brush soapy water (dish soap and water) on every connection, hose and regulator fitting. Growing bubbles mean a leak.
4. If you see bubbles, shut the gas off at once. Do not light the grill, and do not use a flame to look for a leak. Tighten a loose fitting if the manual allows, or replace a cracked hose. For any fixed gas pipe, call a licensed gas fitter.
5. Restore the water supply slowly with the faucet open, then check every joint for drips. Flush the line before drinking from it, and flush the RV antifreeze from the trap.
6. Run the ice maker through a few cycles and discard the first batch.

If you smell gas at any time, leave the area, do not operate switches or flames, and call your gas utility or emergency services from a safe distance.

Should you buy in fall and build in spring?

Winter is a bad time to pour concrete and a fine time to shop. If you are planning a build or an upgrade, you can order the appliances now and install in spring. We have not verified any Black Friday 2026 offers, and Black Friday 2026 is on November 27. Our built-in grill Black Friday guide and pizza oven Black Friday guide explain what we know and how to judge a price.

If you buy early, store the boxes dry and indoors and inspect the head on delivery. Our best built-in gas grills of 2026 and best pizza ovens of 2026 are the shortlists.

The bottom line

Winterizing is clean, shut off, drain, protect and cover, in that order. Treat gas and pressurized plumbing as professional territory, use RV antifreeze and never automotive antifreeze, keep propane cylinders outdoors and upright, and leave island vents open under a breathable cover. In spring, a bottle of soapy water is the cheapest safety tool you own. If you are unsure of any step on your own setup, ask a licensed gas fitter or plumber, and follow your manuals over any general checklist, including this one.