How long does sweetcorn take on a barbecue?

Cobs in the husk, 57 cm kettle, direct, United Kingdom

Sources disagree

Sources that both look credible give incompatible figures. BBQHQ shows both rather than picking one or splitting the difference.

The question, as BBQHQ read it

Food: Corn on the cob
Cooker: 57 cm charcoal kettle
Heat: direct
Where: GB
Weight: 280 g
Quantity: 6 pieces at once

Why there is no window here

No combined window is shown. The sources' figures do not overlap, so any single window would be one publisher's answer wearing everyone's authority.

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

Kernels tender and steamed, with little colour

A kernel gives easily under a thumbnail. Corn in the husk does not take char, and that is the trade this preparation makes rather than a sign of it being underdone.

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 5 observation(s).
2.Observations fall into 3 incompatible groups. They will NOT be combined.
3.8 pairwise conflict(s) recorded and preserved.
4.Unstated by at least one source: cooker temperature, weight, thickness, starting temperature. Treated as uncomparable, not as agreement.
5.No combined window produced. Incompatible groups are reported separately.
6.Confidence: low — the observations do not describe one cook (3 independent publisher(s)).

Disagreements, preserved rather than resolved

Preparation differs: husk-on against husk-removed. (Preparation)
Preparation differs: husk-on against husk-removed. Reported times do not overlap and come from different publishers: 25–30 minutes from Weber-Stephen Products LLC against 4–5 from Iowa State University Extension and Outreach. This is a disagreement, not a wider window. (Preparation, Reported time)
Preparation differs: husk-on against husk-removed. (Preparation)
Preparation differs: husk-on against husk-removed. (Preparation)
Preparation differs: husk-on against husk-removed. Reported times do not overlap and come from different publishers: 25–30 minutes from North Dakota State University Extension against 4–5 from Iowa State University Extension and Outreach. This is a disagreement, not a wider window. (Preparation, Reported time)
Preparation differs: husk-on against husk-removed. (Preparation)
Reported times do not overlap and come from different publishers: 10–15 minutes from Weber-Stephen Products LLC against 4–5 from Iowa State University Extension and Outreach. This is a disagreement, not a wider window. (Reported time)
Reported times do not overlap and come from different publishers: 4–5 minutes from Iowa State University Extension and Outreach against 10–12 from North Dakota State University Extension. This is a disagreement, not a wider window. (Reported time)

How this answer was classified

1.57 published profile(s) considered; 2 cover this question.
2.1 matched profile(s) hold an unresolved disagreement. No window is produced.

Corn on the cob, in the husk

ONE SWEETCORN PROFILE SPLIT INTO TWO, AND HALF A CONFLICT DISAPPEARED. The corn refusal had been classified as a modelling limit: one profile spanning husk-on and husked, no way for a reader to say which they meant, and the two figures reported as though the publishers disagreed. They do not. Weber gives corn in the husk 25–30 minutes and the same corn husked 10–15, on one chart row, because a husk traps moisture and the corn steams rather than grills — that is a preparation difference, and preparation is now a dimension the chooser can ask about. THE SECOND PUBLISHER GIVES THE SAME FIGURE: North Dakota State University Extension prints 'Corn on the cob: peeled, 10 to 12 minutes; in husk, 25 to 30 minutes'. Two independent publishers, one a manufacturer and one a land-grant extension service, 25–30 minutes each. The exact agreement is worth stating rather than glossing, because an identical range invites the suspicion of restatement: NDSU attributes nothing, and the rest of its twelve-vegetable list does not track Weber's chart — its peeled corn figure is 10–12 where Weber's is 10–15, and its whole bell pepper figure has no Weber counterpart at all. What NDSU adds beyond a second voice is that it draws the husk distinction ITSELF, in one line. BBQHQ had to infer that distinction from two publishers who each described one side of it; this one controls the variable.

Corn on the cob, husked

THE HALF OF THE CORN CONFLICT THAT SURVIVED THE SPLIT, and it is a real one. All three of these describe a cob with the husk and silk off, cooked directly on the grate over medium heat: Weber gives 10–15 minutes, North Dakota State University Extension gives 10–12, and Iowa State University Extension gives 4–5, turning frequently. Disjoint figures, independent publishers, and no stated condition between them beyond a heat all three call medium. The preparation dimension exists precisely so this comparison can be made honestly, and the honest result is that it is still a disagreement. A THIRD PUBLISHER IS ADDED AND DOES NOT GET A VOTE. NDSU's 10–12 overlaps Weber and remains disjoint from Iowa State, so the tally is two against one — and this catalogue unions and separates rather than counting heads. A majority is not a reconciliation, and adopting Weber's figure because a second publisher happened to agree with it would settle a disagreement by arithmetic on publishers rather than on evidence. The NDSU row is here because its husk-on row corroborates the other corn profile and a document is admitted whole; taking the useful half and quietly leaving this one is the single bias no check here can catch. No window is published.