In the griddle vs gas grill question, if you already own a gas grill you probably do not need a second appliance. A griddle is a flat steel plate over burners; a grill is open grates over burners. The griddle only earns its space if you regularly cook things that fall through grates or need a solid surface. The cheaper test is a griddle insert made for your exact grill, which Weber, for one, sells for specific models. Buy a standalone griddle only after the insert proves you use a flat-top often, and budget for the upkeep: bare steel needs oiling between uses to stay rust-free.
What actually differs between them
Both are usually propane appliances with burners underneath. The difference is what sits between the flame and the food.
| Gas grill | Flat-top griddle | |
|---|---|---|
| Cooking surface | Open grates | Solid steel plate |
| Flame contact | Direct, through the grates | None; the plate carries the heat |
| Small or loose food | Falls through without a pan or basket | Stays on the plate |
| Grease | Drips through to the cookbox and grease tray | Runs to a channel or trap on the plate |
| Surface care | Clean the grates | Season, clean and oil the steel |
| Lid | Usually has one | Varies by model |
That table is the whole decision in miniature. A grill does direct heat through grates. A griddle does surface contact on steel. Neither does the other's job well without an accessory.
The honest test: what did you cook this month?
Most griddle regret comes from buying for the cooking you imagine rather than the cooking you do. Look at the last few weeks instead.
- If most of it was whole pieces that sit happily on grates, your grill is already the right tool, and a griddle would mostly sit under a cover.
- If a real share of it was loose, small or runny food that you either skipped, cooked indoors or wrestled onto the grill in a pan, that is the gap a flat-top fills.
- If you cook for a crowd at once, a large flat surface can hold more small items side by side than grates can.
A griddle is not a better grill. It is a different surface. The question is how often you need that surface, not whether flat-tops are popular.
Try an insert before buying a second appliance
An insert turns your existing grill into a griddle for the day. Weber's full-size griddle inserts page (read September 27, 2026) lists inserts matched to specific models, including select large Spirit and Searwood grills, 3-burner and 4-burner Genesis grills from 2016 on, the 2024 and later Summit, and 22-inch Weber charcoal grills, and describes them as a way to "transform your entire cooking grate into a griddle."
Three things matter when choosing one:
- Match it to your model. An insert made for your grill is designed around its cookbox and grease path. A generic plate may not sit right or channel grease where your grill expects it.
- Follow the insert's instructions, not just the grill's. A solid steel plate over every burner changes how heat builds under the lid, so the insert's own directions on heat settings and lid position are the ones to follow.
- It is still steel. Unless the maker says otherwise, expect an insert to need the same seasoning and oiling as a standalone griddle.
If a season of using the insert shows you reach for it every week, you have a real case for a standalone griddle. If it lives in the garage, you just saved the space and the money.
The upkeep nobody mentions first
Conversations about flat-tops tend to cover the cooking and skip the maintenance. The maintenance is where griddles differ most from grills.
Blackstone's griddle care guide (read September 27, 2026) is blunt about it: "Steel, air, and water don't really match well. Putting them all together is the perfect recipe for rust." Its routine is to coat the plate with a layer of oil between uses, store the griddle in a cool, dry place, and keep it under a heavy-duty cover.
In practice, that means:
- After every cook: scrape, clean and oil the plate. Skip it and the steel can rust.
- Weather matters. A griddle left uncovered in rain or high humidity needs more attention than a grill does. Covers help, though a cover over a damp surface can trap moisture, a trade-off we look at in do fire pit covers prevent rust.
- Grease management is on you. The plate's grease channel and cup need emptying, just as a grill's grease tray does.
If you already struggle to clean your grill grates, a bare steel griddle will ask for more, not less.
Griddle vs gas grill for safety and siting
A propane griddle is a gas appliance, and the same siting rules apply as for your grill. Burning propane produces carbon monoxide, which you cannot see or smell. The CPSC's Gas Grill Fact Sheet (read September 27, 2026) says never to use a grill indoors because of carbon monoxide and fire hazards, not to use one in a garage, breezeway, carport, porch or under a surface that will burn, and to check for leaks whenever you reconnect the gas container. None of that changes because the cooking surface is flat. Your griddle's manual sets the clearances for that model.
Two griddle-specific points:
- Flammables near the plate. Blackstone's care guide warns: "Don't leave any plastic bags, containers, or other flammable materials close to the griddle top. This can be a fire hazard." A flat top invites people to set things down on it, which a grill's open grates discourage.
- Grease stays on the surface. On a griddle, grease runs across the plate to a channel instead of dropping away. Keep the channel and cup clear so grease does not build up where it can ignite.
The space and fuel question
A second appliance needs its own spot with proper clearance, its own cover, and in most cases its own propane tank or a tank you move between the two. Before buying, check that you have a place that meets the griddle manual's clearances, not just a place where it fits.
If you plan to share one tank, remember that two appliances draw from the same fuel. How long a 20 lb propane tank lasts walks through estimating run time from the BTU rating on the label, which works for a griddle the same way it does for a fire pit.
So, do you need both?
Keep it simple:
- Grill only if most of what you cook sits on grates and you want the least maintenance.
- Grill plus an insert if you want flat-top cooking now and then without a second appliance, a second cover and a second spot on the patio.
- Grill plus a standalone griddle if the insert proved you use a flat-top weekly, you cook for groups, and you are willing to oil the steel after every cook.
- Griddle only is a real option for some households, but only if you rarely cook food that needs open grates.
Whatever you choose, compare models by what their makers publish: plate material, burner count, grease system, warranty terms and parts availability. Claims that one model is "the best" are only as good as the criteria behind them.
We do not cover recipes, cooking times or temperatures here. This page is about the equipment.
FAQ
Is a griddle better than a gas grill? Neither is better overall. A grill cooks with direct heat through open grates; a griddle cooks on a solid steel plate. The right one depends on what you cook most often.
Do I need a griddle if I have a gas grill? Usually not. If you only occasionally want a flat surface, a griddle insert made for your grill covers it. A standalone griddle makes sense if you would use it weekly and have space for it.
Can you put a griddle on a gas grill? Yes, with an insert designed for your model. Weber, for example, lists full-size inserts for specific Spirit, Searwood, Genesis and Summit models. Follow the insert's own instructions on heat and lid position.
Do griddles rust? Steel griddles can rust if left wet or unoiled. Blackstone recommends oiling the plate between uses, storing it in a dry place and using a cover.
Can I use a griddle under a covered patio? Treat it like any propane grill: outdoors only, not in a garage, carport, porch or under a surface that will burn, per the CPSC. Your griddle's manual sets the clearances for that model.