How do I cook salmon fillets on a gas grill?

170 g skin-on fillets, three-burner gas, direct, United Kingdom

Answered

More than one independent publisher covers this, and nothing in the evidence contradicts anything else.

The question, as BBQHQ read it

Food: Salmon fillet
Cooker: Three-burner hooded gas grill
Heat: direct
Where: GB
Weight: 170 g
Thickness: 25 mm
Starting state: fridge cold
Quantity: 4 pieces at once

The cooking window

Estimated cooking window

12 min–15 min

Moderate confidence

Why this is a range, not a number

Thickness varies between pieces
Cookers hold temperature imperfectly

Cook to the endpoint, not to the clock. The window tells you when to start checking.

Why this is not stronger

At least one source does not state the cooker temperature.
No source states whether the food went on fridge-cold or rested.
No source states the thickness, which governs cooking time more than weight.
No source states the weight of the food.

How the window was built

Base, from matched guidance: 10 min–12 min
Straight from the fridge: +1 min–1 min
Food going on cold has further to travel. The effect scales with the length of the cook rather than being a fixed number of minutes.
4 pieces on at once: +1 min–2 min
A loaded grate absorbs more heat, drops the chamber temperature further each time the lid opens, and recovers more slowly.
Final window: 12 min–15 min

When is it done? Separate questions, separate answers

“Done” means several things and they do not coincide. The safety endpoint is set by the jurisdiction you are cooking in and is not a matter of taste. Culinary doneness is what you want. The texture endpoint is how you actually tell.

Food-safety endpoint

BBQHQ holds no food-safety rule for this food in GB. We are not showing you another jurisdiction’s figure in its place — check your national food-safety authority.

Texture endpoint — how you actually know

Just beginning to flake, with the translucency gone

The flesh separates into flakes under gentle pressure from a fork and has lost its raw, translucent look. Clemson gives exactly this signal, and it is more reliable than any temperature for a fish that goes from underdone to dry in about ninety seconds.

Where this comes from

Fish is timed by thickness rather than by weight. Clemson gives ten minutes per inch at 450 °F in an oven, with five minutes added in foil or sauce and double for frozen fish; Weber gives 8–10 minutes per inch on a grill. Doneness is a physical signal — the flesh just begins to flake and loses its translucency.

Well supported

Clemson Cooperative Extension — States this directly
“bake for 10 minutes per inch thickness of the fish, turning the fish halfway through the cooking time”
Method:
Stated for baking at 450 °F, NOT for grilling. The oven is the assumed appliance.
How it was measured:
Measured at the thickest point, after stuffing or rolling if either applies.
Add 5 minutes if cooked in foil or in a sauce; double to 20 minutes per inch for fish cooked from frozen.
About this source · Original · retrieved 2026-08-13
Weber-Stephen Products LLC — States this directly
“General rule for grilling fish: 4 to 5 minutes per ½ inch thickness; 8 to 10 minutes per 1 inch thickness.”
Form:
Expressed per unit of thickness rather than per portion.
Close to but not identical with Clemson's 10-minutes-per-inch rule, which assumes a 450 °F oven rather than a grill.
About this source · Original · retrieved 2026-08-13
Clemson Cooperative Extension — States this directly
“Fish is cooked when its meat just begins to flake easily when tested with a fork and it loses its translucent or raw appearance.”
Form:
A physical signal rather than a temperature — the shape a texture endpoint takes.
About this source · Original · retrieved 2026-08-13

Hazards, by kind

These are not about when the food is done. They are about whether the activity is safe where you are doing it, and each kind sits under its own heading because they are answered in different ways.

Equipment safety

Failure, stability, assembly and maintenance of the cooker itself.

Weber charcoal barbecues: outdoor use only Critical
Weber instructs that its charcoal barbecues must not be used indoors, in a garage, building or breezeway, or any other enclosed area, and not under any overhead combustible construction. Coals and ashes must be fully extinguished before the barbecue is stored.
Wire brush bristles can end up in food Significant
A bristle shed by a wire grill-cleaning brush can be left on the bars, picked up by the next thing cooked on them and swallowed. Documented cases have required surgery to remove it.
Electric does not mean indoor-safe Significant
An electrically powered outdoor cooker is not automatically safe to use indoors. Producing no carbon monoxide removes one hazard; it does not remove fire risk, smoke, or the manufacturer's own restriction on where the appliance may be used.
Electric smokers: earthed supply, RCD protection, outdoor-rated cord Significant
Masterbuilt instructs that its electric smoker runs only from a properly earthed outlet, is supplied through a residual current device rated at no more than 30 mA, and uses only a grounding-type three-wire outdoor extension cord kept dry and off the ground. The supply cord is to be examined regularly and the appliance not used if it is damaged.

Carbon monoxide

Carbon monoxide from burning fuel. Invisible, odourless, and the reason no combustion cooker belongs in an enclosed space.

Never take a barbecue into an enclosed space Critical
Never take a barbecue into a tent, awning, caravan, motorhome, garage, shed or any other enclosed space — including to keep warm, and including when it is no longer flaming.
A cooling barbecue is still producing carbon monoxide Critical
A barbecue continues to give off carbon monoxide as it cools. Never bring one inside to finish cooling, and never store one indoors until it is completely cold.
Electric smokers still produce carbon monoxide — from the wood, not the element Critical
An electric smoker's heat comes from a mains element that burns nothing, and the appliance still emits carbon monoxide, because the wood chips it makes smoke with are burning inside the cabinet. Masterbuilt warns that burning wood chips gives off carbon monoxide, which has no odour and can cause death, and that chips must never be burned inside homes, vehicles, tents, garages or any enclosed area.
Offset smokers: never under an overhead structure of any kind Critical
Oklahoma Joe's instructs that its smoker be used only in a well-ventilated space and never in an enclosed one — naming a carport, garage, porch, covered patio or any overhead structure — and warns that burning charcoal indoors can kill because it gives off odourless carbon monoxide.
Never bring a barbecue indoors to cool Critical
Never bring a barbecue indoors, into a tent or into a garage while it is cooling. A finished barbecue is still producing carbon monoxide and can still start a fire.

Fire safety

Preventing and controlling unintended fire around a cooker.

UK: do not use a barbecue on a balcony Critical
Do not use a barbecue on a balcony. Flames, sparks and hot embers can start a fire that spreads quickly to other parts of the building.
UK: putting out and disposing of coals and ash Critical
Let the barbecue cool and make sure it is properly out before disposing of coals or ash, and never put them in a bin while they are still warm. Smouldering ashes give off carbon monoxide and stay a fire risk for hours after cooking has finished.
UK: where to stand a barbecue, and never leave it Significant
Stand a barbecue on level ground and not on decking, well away from anything that could catch fire — sheds, fences, trees. Never leave it unattended while it is lit.
UK: lighting a barbecue, and local bans on disposables Significant
Never light a barbecue in an enclosed space, and do not use accelerants to get it going. Check local rules before taking a disposable barbecue to a park or open space — many London parks have banned them because of grass-fire risk.

Gas safety

LPG and natural gas: connections, leaks, cylinders and storage.

UK: what not to do with a gas regulator or cylinder fitting Critical
Never force a regulator onto a cylinder valve that it does not fit easily, never work its mechanism with excessive force, and never tamper with or adjust a regulator that is not user-adjustable. Tighten screwed connections with the correct sized spanner and do not over-tighten — most cylinder connections use a left-hand thread and tighten the opposite way to a normal screw. Gas components on a barbecue are replaced, not repaired.
UK: when an LPG regulator has to be replaced Significant
Replace an LPG regulator on the service life its manufacturer states, or after ten years if none is stated, and straight away at any sign of wear, leakage or damage whatever its age. A regulator marked BS 3016 is already past that life. Keep its vent clear and pointing where rain cannot get in, and never fit a second-hand one.

Fuel handling

Lighting, handling and disposing of charcoal, wood and firelighters.

UK: never pour petrol, paraffin or meths on a barbecue Critical
Never pour petrol, paraffin or methylated spirits onto a barbecue or a fire, lit or unlit. Use firelighters, or a chimney starter.
Spent coals can reignite for up to 24 hours Significant
After a charcoal fire appears extinguished, unconsumed embers can retain heat for up to 24 hours and can burst into flame unexpectedly when fresh air reaches them. Embers outside the firebox can ignite combustible surfaces such as a wooden deck.

Electrical safety

Mains power outdoors, cables, water and residual current protection.

UK: use a residual current device for anything that plugs in Significant
Use a residual current device with any mains-powered cooker or equipment used outdoors. If your fusebox does not have one built in, use a plug-in RCD at the socket.
UK: dew counts as wet Significant
Do not run a mains-powered cooker outdoors while the ground or the equipment is wet. Electrical Safety First sets the threshold at dew on the ground, not at rain.
UK: the lead is part of the appliance Significant
Use only extension leads, reels and connectors rated for outdoor use — weather-resistant, with moulded connections. Check them for damage before plugging in, uncoil a reel completely, and use one with a thermal cut-out.
UK: unplug before you fiddle with it Moderate
Switch off and unplug a mains-powered cooker before cleaning, adjusting or checking it.

Wildfire and environment

Fire spreading beyond the cook: dry ground, decking, wind and wildfire risk.

UK: the ground stays hot after the fire is out Significant
The ground under a fire or a disposable barbecue stays hot for some time after the fire has gone out. Let coals and embers cool completely before throwing them away.

The working

How the sources were combined

1.Reconciling 2 observation(s) that bear on the duration. 1 further observation(s) — endpoints, doneness ladders, pull temperatures — are evidence about this cook and are NOT counted as opinions about its length.
2.All observations describe compatible conditions; they form one group.
3.1 temperature pair(s) held apart rather than combined, because they answer different questions.
4.Unstated by at least one source: cooker temperature, weight, starting temperature, thickness. Treated as uncomparable, not as agreement.
5.Combined as the union of reported durations: 10–12 minutes. Union, not mean — the window contains every source's figure.
6.Confidence: moderate — 2 independent publisher(s), with 4 condition(s) unstated.

Held apart on purpose

Figures that look like they should be compared and must not be. Different question, different jurisdiction, or different doneness — not a dispute.

Different outcomes: culinary doneness against food-safety endpoint. These answer different questions and are not combined.

How this answer was classified

1.57 published profile(s) considered; 1 cover this question.
2.Answered: confidence moderate, 2 publishers corroborating the cooking time, no unresolved disagreement.

Salmon fillet, direct heat

Weber gives 10–12 minutes over direct high for a fillet 1 to 1¼ inches thick. Clemson's ten-minutes-per-inch rule is for BAKING at 450 °F and is recorded as an enclosed-oven cook, so reconciliation keeps the two apart rather than treating the near-identical rates as corroboration. What IS corroborated is the shape of the rule: both publishers express fish timing per unit of thickness rather than per portion, which is the correct shape and the one BBQHQ could not previously source.