Covering a grill is worth it once it is cool, clean, and dry — mainly to block rain, snow, dust, and pollen. Covering a hot or damp grill traps moisture that speeds up rust and mildew.
A cover is not a permanent shield. Timing is everything: cover after the grill has cooled and dried, and uncover now and then so trapped air can escape. Get that order right and the cover protects the finish, grates, and burner tubes for years. Get it wrong and you have built a greenhouse on top of your grill. Most grill damage blamed on weather actually comes from moisture sealed in under a cover that went on too early.
Is It Bad To Leave Your Grill Covered All The Time?
No, but “all the time” is the problem. A grill needs periodic air, especially after rain or snow. Napoleon’s grill care blog notes a cover is mainly for bad weather and long storage, not 24/7 duty. Sealed over a grill for weeks, condensation stays trapped — the humid pocket where rust and mildew start.
Once a month, or after a heavy storm, pull the cover off and let the grill sit open in the sun for an hour. If the cover is damp inside, dry it completely first — a wet cover does more harm than none.
When Should You Cover Your Grill?
Cover it once it is cool to the touch, the metal is dry, and you either expect rough weather or plan to store it for a while.
- Cool to the touch: Never cover a warm grill. Trapped heat plus residual moisture is a corrosion cocktail.
- Dry: Wipe down the lid and body, and let the inside air out with the lid open for a few minutes.
- Weather incoming: Rain, snow, and wind-driven grit are the main reasons to cover. Under an awning in a mild climate, the cover matters far less.
- Long storage: For weeks of non-use, clean thoroughly, dry, and cover. Dust settles in a stored grill fast.
Outside those windows, the cover can come off. Uncovered for a day of cooking is fine; uncovered through a winter of rain is what damages it.
| Condition | Cover The Grill? | Why It Matters |
|---|---|---|
| Grill is hot or warm | No — wait | Traps heat and moisture, feeds rust |
| Grill is wet | No — dry first | Seals damp air inside, promotes mildew |
| Cool, dry, rain coming | Yes | Blocks water, dust, and debris |
| Long-term storage | Yes, after cleaning | Keeps out grit and precipitation |
| Cover is soaked inside | No — let it dry | A wet cover is worse than none |
| Sheltered patio, mild weather | Optional | Little rain exposure to guard against |
| After heavy rain or snow | Airing out | Releases trapped moisture |
What Makes A Grill Cover Actually Work?
Fit is the whole game. A cover designed for your exact model keeps gaps and pooling minimal, and brand-made covers usually match dimensions best. A loose cover flaps in wind, pools water, and lets rain run into the firebox. Look for adjustable side straps and vents so moisture escapes rather than sits. Our tested roundup of barbecue and grill covers compares fit, strap design, and venting. Where you park the grill matters too: keep it sheltered with space from walls, out of direct wind. Napoleon’s guide to grill cover use lays out the same logic: cover for protection, uncover for airflow.
The Common Mistakes That Cost You A Grill
Two wrong habits cause most damage: covering a warm or damp grill, and leaving it fully exposed during storage. Covering a warm grill traps heat and moisture — corroding burners and encouraging mold on grates. Covering a damp grill does the same, slower. The mirror mistake is leaving a grill uncovered for months, letting dust, debris, and rain work on the finish and burners.
The routine is short: clean, cool, dry, drape the cover over every surface, and fasten side straps near the bottom. To cook, unfasten, lift the cover, and let the grill breathe before lighting. A few minutes of patience keeps the grill out of the repair shop.
FAQs
Can I put a cover on my grill while it is still cooling?
No. A grill still radiating heat traps that warmth under the cover, and leftover moisture condenses on the metal — exactly what rust and mildew need. Wait until the surface is cool to the touch, usually 30 to 60 minutes after the burners are off.
How often should I take the cover off a stored grill?
About once a month, and again right after heavy rain or snow. Let the grill air out for an hour and check the cover’s inside is dry before replacing it. This releases trapped moisture before it works on the metal.
Do I need a cover if my grill lives under a patio roof?
Not always. If it stays dry and out of the wind, a cover is optional. Dust and pollen still settle, though, and shelter does not stop blowing rain during a storm. A lightweight cover is cheap insurance if protection is only partial.
References & Sources
- Napoleon. “When to Use Your BBQ Cover for Protection.” Supports timing guidance on covering for weather and storage.
- Popular Mechanics. “How to Protect Your Grill.” Supports general grill protection and moisture-risk guidance.
- Food Network. “Best Grill Covers.” Supports fit, strap, and venting considerations for grill covers.
- Kitchprep. “Best Barbecue and Grill Covers.” Tested roundup comparing cover fit, straps, and venting.
