Skip to content
Grow In Backyard
Fire Pits

How Hot Do Fire Pits Get? Temperatures and Safe Distances

A wood fire pit runs 600 to 1,100 °F at the flame and radiates enough heat to scorch decking. The numbers that decide clearances.

By Zakaria 2 min read Save to Pinterest — opens Pinterest in a new tab
Flames rising between lava rocks in a round gas fire pit
Photo: distelAPPArath, Pixabay Content License, via Pixabay
On this page

A wood fire pit runs 600 to 1,100 °F, and the number that matters for your deck is not the flame temperature but the radiant heat downward and sideways.

Temperature ranges

sourceflame / coal temperature
Softwood fire~600–900 °F
Hardwood fire, established~800–1,100 °F
Charcoal~700–1,000 °F
Propane fire pit~1,000 °F flame, far less radiant
Natural gas fire pitSimilar to propane
Smokeless secondary-burn pitHotter burn, cleaner, hot exterior

Clearances

fromtypical minimum
House or structure10–25 ft
Fence or property line10 ft
Overhead canopy, eaves, branches10–25 ft vertical
Vehicles, fuel, propane cylinders10 ft+
Seating2–3 ft from the rim

These are commonly code requirements rather than suggestions, and insurers ask about them after a claim. Check locally.

Charring happens below ignition temperature

Timber does not need to reach flame temperature to be damaged. Sustained radiant heat chars and weakens decking, and repeated cycles lower the temperature at which it will eventually ignite. A pit that “seemed fine last summer” is not evidence of a safe arrangement.

Protecting surfaces

  • Decking: a heat shield or fire-pit pad rated for the purpose, plus legs lifting the bowl clear. Better still, use propane
  • Concrete: never light directly on a slab. A sand or lava-rock base in the bowl plus a pad underneath reduces spalling
  • Pavers: more tolerant than poured concrete, still not immune
  • Grass: a pit on legs plus a paver base; radiant heat kills turf in a circle regardless
  • Gravel or sand: the safest surface there is

Shutting down safely

  1. Let it burn down rather than smothering a hot fire
  2. Douse with water and stir the ash, then douse again
  3. Feel for heat with a hand held above, not in, the ash
  4. Never leave it unattended until cold
  5. Store ash in a lidded metal can, away from the house, for several days before disposal

Common questions

How hot does a wood fire pit get?

Roughly 600 to 1,100 °F in the flame and bed of coals, with a well-established hardwood fire sitting around 900 °F and brief peaks above that when it is burning hard with good airflow. The bowl itself runs cooler but still hot enough to ignite nearby material, and the underside radiates downward — which is what damages decking and scorches lawns. Propane fire pits burn in a similar flame-temperature range but produce far less radiant heat downward because there is no bed of coals.

How far should a fire pit be from a house or fence?

Ten to twenty-five feet is the usual requirement, and many jurisdictions specify a minimum rather than leaving it to judgement — ten feet from any structure or property line is a common figure, with twenty-five feet for larger permanent pits. Overhead clearance matters just as much: keep at least that distance from tree canopy, eaves and anything overhanging. Check your local fire code, because these distances are enforceable and insurers ask about them.

Can you put a fire pit on a wooden deck?

Only with a purpose-made barrier, and only where the manufacturer permits it. Radiant heat from the bowl base will scorch and eventually char decking beneath a pit sitting directly on it, and timber chars at temperatures far below ignition. Use a fire-pit pad or heat shield rated for the job, keep the pit on legs that lift it clear, choose a propane or smokeless model over an open wood fire, and accept that many deck warranties and many fire codes rule it out entirely.

Will a fire pit crack a concrete patio?

It can, through thermal shock and spalling. Concrete holds moisture, and heating it rapidly turns that moisture to steam which flakes the surface off; repeated cycles craze and crack it. Pavers tolerate it better than a poured slab, but neither is immune. A layer of sand or lava rock in the pit base, a pit raised on legs, and a heat-resistant pad underneath all reduce it. Do not light a fire directly on a slab.

Does a propane fire pit get as hot as wood?

The flame does, broadly, but the experience is different. Propane burns at a similar flame temperature yet produces much less radiant heat because there is no mass of glowing coals, so a propane pit feels cooler at the same distance and warms a smaller circle. It also stops instantly, produces no embers and no smoke, and is the safer option on a deck or under any kind of cover where local rules allow a gas appliance.

How long does a fire pit stay dangerous after burning?

Hours. A bed of wood coals can remain hot enough to ignite dry material for six to twelve hours, and buried embers in ash stay live far longer than the visible fire suggests. Never leave a pit unattended until it is cold, douse it with water and stir the ash rather than just pouring water on top, and store ash in a metal container with a lid away from the house — ash removed too early has started a great many house fires.

Backyard Weekly

Know what to plant, week by week

Join the weekly email for seasonal jobs, fixes for what is going wrong, and gear worth buying.

Not ready to subscribe? The planting calendar is free and needs no email.

By subscribing you agree to our privacy policy. Grow In Backyard will never sell your address.

Keep reading