Forest Thinning in Spokane County: DNR Rules and What to Settle First

Forest thinning cuts crowded trees so the rest have more light, water and room. In Washington, whether it needs a Forest Practices permit depends on what you do with the wood, where the equipment works and how steep the ground is.

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What forest thinning is

Thinning means cutting some trees in a crowded stand so the trees left have less competition. DNR's financial-assistance page says reducing overcrowding, through thinning or pruning back ladder fuels, reduces competition for light, water and nutrients among remaining trees and makes a forest better able to stand up to threats including catastrophic fire.

DNR's forest practices guidance defines precommercial thinning as cutting trees not for financial return but to reduce stocking for goals such as increased fire resiliency. The material is typically left on site. The same guidance says stands that are precommercially thinned are typically younger than age 20 with trees under 6 inches across at breast height, and that older or larger stands are typically thinned commercially.

This page covers the rules and questions around thinning. It does not tell you which trees to cut. A DNR forester can do that on a free consultation if you qualify.

When people look into this

A stand of small trees has grown thick and crowded.
A landowner wants to know about DNR consultations and cost-sharing.
Thinned material is meant to be sold or removed.
A landowner is planning work near a creek or wet area.
A property has steep ground and the question is what rules apply.
A forest stewardship plan is being written.

What the work usually looks like

Ask DNR. A forester consultation can look at stand density, thinning and slash.
Check the rules. Decide whether a Forest Practices permit is needed.
Mark the trees. Trees to cut and trees to leave are marked.
Thin. Trees are cut by hand or by machine.
Handle the slash. Material is left, chipped, hauled or handled as the rules allow.
Walk the result. The stand is checked against the plan.

How to prepare

Before work starts, it helps to settle these points:

Ask DNR for a free consultation if you own less than 5,000 forested acres.
Decide what happens to the wood: left, sold or used.
Measure how far work will be from any water.
Note steep ground and unstable areas.
Ask a DNR region office if you are unsure whether a permit applies.
Ask DNR about cost-share and when work can start.
Ask who marks trees and who decides what stays.
Get the scope and price in writing.

What affects the cost

Prices vary with the land, the equipment and the work. A Forest Service research bulletin says mastication costs vary widely with the equipment, the terrain, site conditions and operator skill. For thinning, tree size, slope and what happens to the wood matter most.

Stand density and tree size. Thicker stands and larger trees take more work.
Slope. Steep ground slows machines.
Wood handling. Leaving, chipping, hauling or selling changes the scope.
Distance from water. Work near water takes more care and may need a permit.
Access. Roads and landings change costs.
Cost-share paperwork. DNR sets the application steps.
Pricing basis. Per acre or per hour.

Why the first call should be to DNR

Thinning sits between land clearing and forestry, and the rules depend on details you may not think matter: where the equipment will work, how steep the ground is and whether the wood is sold. A short call to the DNR region office, or a free consultation if you qualify, can settle whether a permit applies before a machine arrives.

It also lets you ask about cost-share. DNR's page describes an application that DNR decides, so ask DNR when work can start relative to its decision. Write down what you learn, because the written answer is what you can hand to a company when you ask for a price.

Local rules and sources

Forest Practices. DNR's forest practices guidance for thinning says a Forest Practices permit is needed if you sell any harvested timber, if you harvest 5,000 board feet (about one log truck load) or more in 12 months, if equipment will work in or near certain waters or riparian zones (DNR says to call if you will be within 200 feet of any water), if equipment goes off-road on side slopes over 40 percent, or if work touches unstable landforms, cultural sites or habitat of state-listed species. It adds that a county clearing and grading permit or a DNR wildfire burn permit may also apply. DNR also says that if thinned material is sold, the work cannot be a Class I practice, and that removing biomass from the site is a type of harvest, with an exception for personal-use firewood under 5,000 board feet.

Funding. Washington DNR's financial assistance program for wildfire resilience and forest health says non-federal owners of forestland who own less than 5,000 forested acres can be eligible. DNR offers free consultations with a forester and shares the cost of qualifying treatments up to a predetermined amount. DNR does not do the work. The program page does not name forestry mulching, so ask DNR whether your project qualifies. For Spokane County, contact DNR's Northeast Region at ne_loa@dnr.wa.gov.

Burning. Spokane Regional Clean Air Agency (SRCAA) says land clearing fires are prohibited in Spokane County. A narrow exception applies when the fire is to abate or prevent a forest fire hazard, the material comes from less than one acre of forested land on a parcel of five acres or more in non-commercial ownership, and the Washington Department of Natural Resources (DNR) decides the criteria are met, in which case DNR approves the fire and issues a permit. Burning yard and garden debris is not allowed for most Spokane County residents, with an exception inside Fire Districts 2, 5, 11 and 12. SRCAA also says debris from unimproved property may be burned under DNR's permit or rule burn programs when the land is outside the county's cities and urban growth areas and is protected by DNR, and that parts of the county are in a Smoke Sensitive Area with extra restrictions. DNR's burn permit page separately says DNR does not permit burning of debris from land clearing operations, so ask DNR whether the narrow exception fits your project before you plan any fire.

Registration. In Washington, search the company on the Department of Labor & Industries “Verify a Contractor, Tradesperson or Business” page. Clearing and tree work are contractor specialties at L&I, but which one covers mulching isn't spelled out, so confirm which specialty the company is registered under.

Reasons to trust this page

Most rules on this page name their public source, such as a Washington statute or a DNR page.
Cost factors are explained in plain terms, and the only price figure is a general range from a third-party directory, with no quote behind it.
The email address is shown at the top of every page, and the Privacy page says what a quote request collects.

Common questions

Does thinning my trees need a permit?

It can. DNR says you need a Forest Practices permit if you sell any harvested timber, harvest 5,000 board feet or more in 12 months, work equipment near certain waters or riparian zones, operate off-road on slopes over 40 percent, or affect unstable landforms, cultural sites or listed species. If unsure, contact your DNR region office before work starts.

What is precommercial thinning?

DNR defines it as cutting trees not for financial return but to reduce stocking for goals such as increased fire resiliency. The material is typically left on site. DNR says stands thinned this way are typically younger than age 20 with trees under 6 inches across at breast height, and older or larger stands are typically thinned commercially.

Can DNR help with thinning?

DNR's financial-assistance program for wildfire resilience and forest health offers free consultations and shares the cost of qualifying treatments up to a set amount, for non-federal owners of fewer than 5,000 forested acres. DNR does not do the work. The page says thinning and pruning ladder fuels are among the treatments, so ask whether yours qualifies.

What happens to the thinned wood?

That decides part of the rules. DNR says precommercial thinning where residual material is left on site is not commercial harvest, but removing thinned trees or biomass from the site is a type of harvest, with an exception for personal-use firewood under 5,000 board feet. Settle the plan for the wood before work starts.

How much does forest thinning cost?

Prices vary with the land, the equipment and the work. A Forest Service bulletin says mastication costs vary widely with equipment, terrain, site conditions and operator skill. Stand density, tree size, slope and wood handling change the total. Get a written scope and price, per acre or per hour, and ask about cost-share first.

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