What Is the Best Firewood to Burn in a Colorado Fireplace?

Homeowners often ask whether oak, pine, aspen, or another species is the “best” firewood. Species matters, but moisture content matters more.

Dry wood burns hotter and cleaner than wet wood. EPA guidance recommends properly seasoned firewood with moisture content around 20 percent or less.

Start with moisture, not species

A dense hardwood with high moisture can burn worse than a properly seasoned softwood.

Wet wood uses energy to boil off water before the fuel can burn efficiently. That produces cooler fires, more smoke, and conditions that can contribute to creosote accumulation.

Hardwood versus softwood

Hardwood

Dense hardwoods generally contain more energy per piece and can provide longer burns once established.

Softwood

Softwoods can ignite quickly and are useful for kindling and starting a hot fire. Properly seasoned softwood is not automatically “bad for chimneys.” The problem is wet, smoky burning - not simply the fact that the wood came from a conifer.

What about pine?

A common myth says pine always causes chimney fires because it contains resin.

Any wood can contribute to creosote when burned wet, cool, or with insufficient air. Dry pine can be burned appropriately in a fireplace or appliance designed for wood when used according to the system's instructions.

The bigger issue is moisture and burning practice.

How dry should firewood be?

EPA guidance uses about 20 percent moisture or less as a useful target.

Test the freshly split face of the log with a moisture meter rather than only the outside surface.

Wood stored outdoors should be split, stacked off the ground, covered on top, and left open on the sides for airflow.

How long should Colorado firewood season?

Drying time depends on species, split size, sun, airflow, humidity, and storage.

EPA materials commonly reference at least six months for softwood and a year or more for hardwood as general guidance. Colorado's dry climate can help, but a poorly stacked pile can still stay wet.

Use a meter rather than relying only on time.

What should you never burn?

Avoid:

• - Painted wood
• - Pressure-treated lumber
• - Plywood or glued products
• - Household trash
• - Plastic
• - Wet green wood
• - Construction debris of unknown treatment

These materials can release harmful pollutants and may damage the fireplace or chimney.

Buy local firewood when possible

Moving firewood long distances can transport invasive insects and tree diseases. Local forestry agencies often recommend sourcing firewood near where it will be burned.

Build a hotter, cleaner fire

Use dry kindling, allow adequate air, and add larger pieces gradually. Avoid choking the fire into a long smolder.

A clean-burning fire should produce relatively little visible smoke after it is established.

Bottom line

The best firewood for a Colorado fireplace is dry, appropriately sized, and burned with enough air. Species influences heat and burn time, but moisture and fire-building habits have a bigger effect on smoke and creosote.