How to Keep a Fire Going in a Fire Pit | FirePitSpot
How-to guide

How to keep a fire going in a fire pit

A fire that keeps dying has one of three problems: wet wood, poor structure, or no coal bed to build on. Fix any one of those and the fire runs itself. Fix all three and you will not touch it for hours.

By FirePitSpot Editorial  |  8 min read

A fire pit with a well-established wood fire burning steadily with a strong coal bed glowing underneath split hardwood logs
A solid coal bed under active flames is the marker of a fire built correctly. That coal bed is what keeps a fire going between log additions without constant tending.
The short answer

Dry, seasoned hardwood below 20 percent moisture content, a top-down fire build, and one or two logs added at a time onto an established coal bed. The EPA recommends starting with a small, hot fire using dry kindling, then gradually adding larger pieces with good airflow between them. Everything else on this page is a variation of those three principles.

Why fires go out: the three causes

Every fire that keeps dying traces back to one of three things. Identify which one you are dealing with and the fix is straightforward.

Cause 1

Wet or green wood

Moisture inside the wood has to boil off before the wood can burn. That takes heat the fire cannot spare. The fire spends all its energy making steam instead of growing, then dies when the kindling runs out. If the wood hisses, steams, or smokes heavily without much flame, moisture is the problem.

Cause 2

No coal bed

A coal bed is the glowing base of partially burned wood that holds heat and re-ignites new logs when they are added. Without one, each log has to be ignited from scratch. Adding large logs before a coal bed is established is the most common reason a fire stalls after a good start.

Cause 3

Smothered airflow

Fire needs oxygen. Stacking logs flat against each other, overloading the pit, or blocking the air gaps around the base cuts off the oxygen supply. The fire smolders, produces heavy smoke, and eventually goes out despite having plenty of fuel.

Fix 1: wood moisture is the biggest lever

The EPA's best wood-burning practices guidance is specific: wood burns most efficiently at a moisture content below 20 percent. Freshly cut wood can contain 50 to 60 percent moisture. The energy that should go into flame and heat instead goes into boiling water out of the wood.[1]

The fix is not a technique. It is time and storage. Hardwood needs at least six months of seasoning for softwoods and a year or more for dense hardwoods like oak and hickory. Split the logs before storing: split faces dry dramatically faster than whole rounds. Stack them off the ground with the top covered but sides open so air can circulate. A $20 moisture meter removes all guesswork: split a log, press the probes into the fresh face, and read the number.

The hiss test: Hold a split log near the fire before placing it on. If it hisses, spits, or produces a small cloud of steam, it is too wet to sustain a fire. It will draw heat from the coal bed rather than contribute to it. Set it aside to warm near the fire first, then add it after 15 to 20 minutes.

Which wood burns longest: BTU output by species

Dense hardwoods contain more fuel mass per log than softwoods. That density is why they burn longer, produce more sustained heat, and hold a coal bed better. The University of Kentucky College of Agriculture extension publishes firewood heat content data based on air-dried wood at below 20 percent moisture.[2]

Softwood is not useless. Pine and fir light fast and burn hot initially, which makes them excellent kindling to get hardwood going. The problem is burn rate: softwood exhausts itself in a fraction of the time hardwood does. A fire built entirely on pine needs constant feeding and produces more sparks than a hardwood fire. See our complete firewood guide for species availability by region.

Fix 2: the top-down build that tends itself

The traditional fire build puts tinder and kindling at the bottom with large logs on top. It works, but it requires constant tending because the kindling burns out before it has properly ignited the large logs above it. The top-down method inverts this, and the physics explain why it works better.

When you light the top of a top-down build, the heat and flame travel downward. Each layer preheats the layer below it before it is asked to catch. By the time the flame reaches the large base logs, those logs have been warming for 10 to 15 minutes and ignite readily. The coal bed forms from the top down and consolidates into a stable, hot base that will sustain the fire for the rest of the evening with minimal intervention.

Place two or three large hardwood logs at the base

These are the fuel that will carry most of the evening. Leave a small gap between them so air can circulate underneath. Oak, hickory, or ash work best here because they burn slowly and hold a good coal bed.

Cross medium splits on top at 90 degrees

The perpendicular crossing creates a stable platform for the layer above while leaving air channels running in two directions. These medium pieces catch before the large logs and bridge the heat downward.

Add a generous kindling layer

Dry, thin sticks or split softwood pieces roughly the diameter of a pencil. These catch easily and generate the heat that warms the layers below. The more surface area the better, so split or break kindling into thinner pieces if it is not catching quickly enough.

Place tinder at the very top

Crumpled newspaper, dry wood shavings, or a natural fire starter. Keep it minimal. The job of tinder is to get the kindling burning, not to serve as the fire itself.

Light the tinder and leave the fire alone

Light from two or three points across the top. Then step back. The temptation to rearrange or blow on the fire in the first few minutes disrupts the downward burn sequence. The EPA's tips for a better burn note that creating space between logs for airflow and letting the fire develop naturally produces a cleaner, more efficient result.[3]

Add logs to the coal bed, not the flame

Once you have a solid bed of glowing coals, add one or two fresh logs at a time. Place them on the coal bed, not leaning against existing flames. The coals will ignite the new wood from below. Maintain the gaps that let air flow under and around the logs.

Fix 3: airflow is the variable nobody talks about

A fire needs a continuous supply of oxygen. The most common way people accidentally cut it off is by adding too much wood at once. Overloading the pit creates a pile so dense that air cannot penetrate it, and the fire smothers rather than burns. The result is heavy smoke, low heat, and a fire that seems to have gone out even with plenty of wood remaining.

The correct approach is one or two logs at a time, positioned so there are visible air gaps between pieces. The gaps do not need to be large, but they need to exist. Think of a log addition as managing airflow first and fuel second. A fire with three logs and good airflow burns hotter and longer than a fire with seven logs packed tightly together.

Do this
✓Add one or two logs at a time onto an established coal bed.
✓Position logs so air gaps are visible between and under them.
✓Use dry, seasoned hardwood. Test with a moisture meter before buying.
✓Use softwood or smaller splits as kindling to start and grow the coal bed.
✓Let the fire develop for 15 to 20 minutes before making any adjustments.
Avoid this
✗Adding large logs before a coal bed exists to receive them.
✗Piling logs flat against each other without air gaps.
✗Using wood that hisses or steams when placed near heat.
✗Blowing on or rearranging the fire in the first few minutes of a top-down build.
✗Using accelerants to restart a fire that has gone low.

Wind: when the fire pit works against you

Wind is a complicating factor in an open fire pit because it does two opposite things depending on its direction relative to the fire. Wind blowing across the top of a deep pit can create a low-pressure zone that actually draws air upward through the pit and feeds the fire. Wind blowing directly into the pit from the side can scatter embers and create uneven combustion zones where one side burns too hot and the other starves.

If wind is an issue, the simplest fix is orientation. Position the fire so the wind approaches from the side or behind the largest log mass, not directly across the open face of the pit. On very windy days, a spark screen helps contain the fire while still allowing airflow. Our safety and clearance guide covers when wind conditions warrant skipping the fire entirely, including during red flag warnings and high-wind advisories.

Keeping a gas or propane fire pit running

The wood fire advice above does not apply to a gas fire pit. A gas flame does not require a coal bed, does not benefit from a particular build structure, and is not affected by wood moisture. If a gas fire pit is going out or running unevenly, the issue is almost always mechanical: a partially clogged burner port, a regulator problem, a low propane tank, or media that is restricting gas flow.

The most common gas fire pit fix is cleaning the burner ports and checking the lava rock or fire glass depth. Media packed too deep restricts the gas before it can ignite at the surface, which produces a reduced or patchy flame. See the lava rocks guide for the correct depth and cleaning process, and our fire pit cleaning guide for burner port maintenance. For runtime on a propane tank, our propane tank runtime calculator works out how long a 20-pound tank will last at your BTU setting.

Frequently asked questions

Why does my fire pit keep going out?
The three most common causes are wet or green wood, adding logs before a coal bed has formed, and smothered airflow from logs packed too tightly. Check wood moisture with a meter: the EPA recommends below 20 percent. If the wood hisses, steams, or produces thick white smoke when placed near heat, moisture is the problem. If the fire dies each time you add a large log, the coal bed is not established enough yet to ignite it.
What wood keeps a fire going the longest?
Dense, seasoned hardwoods burn the longest. Hickory produces roughly 29 million BTU per cord, white oak around 28 million, and sugar maple around 26 million, according to University of Kentucky extension firewood properties data. All of those are nearly double the output of white pine at 15 million BTU per cord. The practical result is that hardwood logs need replacing far less often and hold a coal bed much longer than softwood.
How do you keep a fire going without smoke?
Burn dry, seasoned wood below 20 percent moisture and build a hot, well-fed fire rather than a low, slow one. The EPA notes that a small, hot fire started with dry kindling and good airflow between logs produces significantly less smoke than a smoldering fire. The top-down build helps because the large base logs preheat gradually before they are asked to ignite, which produces cleaner combustion with less unburned gas escaping as visible smoke.
How often should you add wood to a fire pit?
Add one or two logs when the existing fire has burned down to a solid coal bed with active flames but the current logs are past their peak output. With hardwood, a good coal bed holds heat for 20 to 30 minutes, so there is no need to hover over the pit. Adding logs too early smothers the fire. Waiting until the coals are nearly out makes re-ignition harder. The coal bed is your indicator, not the clock.
Does a bigger fire mean a longer fire?
No. Overloading a fire pit smothers airflow and produces a heavy, smoky fire that burns inefficiently. A moderate fire maintained with dry hardwood, one or two logs at a time with visible air gaps, will burn longer and cleaner than a pile. The goal is a hot, sustained fire, not the biggest flame the pit can produce.
What is the top-down fire build method?
The top-down method places the largest logs at the base, medium splits above them, kindling above that, and tinder at the very top. You light only the tinder. The fire burns downward through each layer, preheating the fuel below before it is asked to ignite. It produces less smoke than the traditional bottom-up method, builds a strong coal bed faster, and requires almost no tending once lit.

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Sources

  1. U.S. EPA, "Best Wood-Burning Practices," Burn Wise program. Recommends wood below 20 percent moisture content and starting with a small, hot fire using dry kindling with good airflow between pieces.
  2. University of Kentucky College of Agriculture, Forestry, and Natural Resources, "Comparison of Properties Affecting Firewood." BTU per cord data for hardwood and softwood species at approximately 20 percent moisture content.
  3. U.S. EPA Burn Wise, "Tips for a Better Burn." Recommends creating space between logs for airflow and allowing the fire to develop without interference.