Best time of year to cut down a tree in Washington and Oregon

Timing is one decision in a tree removal in Washington or Oregon; the others are the permit, the method and the price, which is on tree removal cost. This page is about removal only. Pruning runs on a different calendar, covered in the best time to trim trees, and if you plan to fell a small tree yourself, start with how to cut down a tree.

When is the best time to cut down a tree?

It depends less on the tree than on what else is happening that month: birds, storms, mud, beetles and fire rules. The short version by situation:

Tree removal calendar: west and east of the Cascades

Sources: NOAA Storm Events Database and 1991–2020 climate normals (computed by Westcoast-Tree.org); King County Noxious Weed Control Program (nesting window); ODA emerald ash borer quarantine flyer (August 2025); ODF slash management and Ips fact sheets (April 2021); RCW 76.04.005; all checked 2026-10-02. The “good window” and “best” labels are Westcoast-Tree.org’s reading of these sources, not an agency rating.

Storm season: why winter removals compete with emergencies

NOAA’s Storm Events Database logged 3,662 high wind, strong wind, ice storm and heavy snow reports in Washington and Oregon from 2016 through 2025, and 2,947 of them, 80 percent, began in November through February. June, July and August together had 13. These are report rows, often several per storm, not unique storms or a count of fallen trees, but the season is unmistakable.

Sources: NOAA NCEI Storm Events Database, 2016–2025 report rows (high wind, strong wind, ice storm, heavy snow); NOAA NCEI 1991–2020 monthly normals, stations USW00024233, USW00024229, USW00024157 and USC00350694; checked 2026-10-02.

The two sides of the mountains get different storms. The Seattle and Portland National Weather Service offices, which cover roughly the west side, logged 1,372 of these reports, 79 percent of them November through February and none in June, July or August. The Spokane and Pendleton offices, covering most of the east side, logged 1,783, 84 percent in November through February, and about four in five of their reports were heavy snow. (Medford’s office, which covers both sides of the Oregon Cascades, is left out of both counts.) Recent examples are on the site’s storm records pages, including the November 2024 bomb cyclone and the January 2024 ice storm.

That is the practical case against booking a planned job for December: when a windstorm or ice storm hits, trees on houses, cars and roads come first. A tree that is already damaged or failing doesn’t wait for a good month; that’s hazard tree removal, and a tree already down on a vehicle is covered in tree fell on a car. For everything else, what a removal involves is on the tree removal page.

Winter tree removal: leaves off, ground soft

Winter has real advantages. A deciduous tree is bare, so its structure and any old nests are easy to see, and a nest with no eggs or young in it is not the problem an active one is (more below). In Oregon’s emerald ash borer counties, it falls inside ODA’s October-to-March window for ash.

The cost is mud west of the Cascades. NOAA’s normals put 17.81 of Seattle-Tacoma’s 39.34 inches of yearly precipitation in November through January, and 16.25 of Portland’s 36.92. A loaded chip truck, loader or crane on a soaked lawn is heavy equipment on soft ground, and the International Society of Arboriculture notes that heavy equipment compacts soil, which slows root growth and cuts the water and oxygen roots need in the trees you are keeping. East of the Cascades the issue is snow: Spokane averages 45.4 inches of snow a year, more than half of it in December and January.

Can you cut down trees in spring? Nesting season rules

You can, but spring is when the law on bird nests matters most. The Oregon Department of Fish and Wildlife (ODFW) puts it simply: all native migratory birds are protected by federal law, and it is illegal to injure, kill or possess a native bird or to interfere with an active nest. ODFW adds that a nest can be moved only if no eggs or young are in it.

The U.S. Fish and Wildlife Service’s nationwide measures for projects (updated July 2024) give the working method. Schedule vegetation removal and trimming outside the peak bird breeding season where practicable. If the work can’t wait, survey for active nests no more than five days before it starts, and if you find an active nest or breeding behavior, hold off on removal until the young have fledged, the nest fails or the behavior stops.

Neither agency publishes a calendar for private yard work. The nearest Northwest date range we found comes from King County’s weed program, which advises against large brush removal projects in nesting season and puts that at mid-March to the end of June; that is the window marked on the calendar above. In practice: walk the tree before the crew comes, ask the climber to check for nests as the work goes up, and if the tree holds an active nest, wait until the young have fledged.

Ash, pines and fire season: the summer rules

Ash in Oregon’s emerald ash borer quarantine

In Oregon’s Washington, Yamhill, Marion, Clackamas and Multnomah counties, ODA’s quarantine flyer (August 2025) says to do ash removal and pruning from October 1 to March 31 and get the wood to a processing facility inside the quarantine before April 1. Ash logs, branches, stumps, roots, chips and mulch, and firewood of any hardwood, may leave the quarantine area only after an approved treatment, such as chipping to 1 inch or less, or under an ODA compliance agreement (OAR 603-052-1075), and violations can bring civil penalties up to $10,000 (ORS 570.995). More on the beetle is at emerald ash borer in Oregon. Washington’s first emerald ash borer was found in August 2026 in Hazel Dell, just north of Vancouver in Clark County, and confirmed on August 19 (see emerald ash borer in Washington); the state Invasive Species Council asks people not to move firewood away from where it was cut.

Pines and bark beetles

Ips bark beetles breed in fresh pine slash 3 to 8 inches in diameter, fly from April into October, can produce 2 to 3 generations a year, and then attack standing pines nearby (ODF). ODF’s guidance is to create pine slash from October through December and let it dry on the ground; from January through September, avoid creating slash that size, or burn, chip, masticate or bury it right away. That puts late fall at the top of the list for ponderosa pine country east of the Cascades and for pines anywhere; see pine bark beetles.

Fire season on or near forest land

Washington’s fire closed season runs April 15 to October 15 unless the Department of Natural Resources (DNR) sets other dates (RCW 76.04.005). During it, DNR can restrict logging, land clearing and other operations that could start a fire on or next to the forest land it protects, using industrial fire precaution levels (WAC 332-24-301): at Level 2, power saws may run only from 8 p.m. to 1 p.m., except at loading sites, and Level 4 shuts all operations down. DNR describes the system as applying to woods workers and industrial forest users on unimproved private and state forestland, so it is not a rule for ordinary yard work, though a clearing or logging job at the forest edge can fall under it. In Oregon, the State Forester declares fire season district by district (ORS 477.505), and ODF’s industrial precaution levels west of the Cascades carry the same 8 p.m.-to-1 p.m. saw limit at Level II and a full shutdown at Level IV; ODF says that system does not apply on lands it protects east of the Cascade summit, and its restrictions map shows the current public and industrial rules for every district.

Burning: fire season is burn-ban season. When DNR has a burn restriction in place, it prohibits outdoor fires on all lands under DNR fire protection. Plan to chip the brush; local rules are on Washington yard debris burning rules and Oregon yard debris burning rules. Not legal advice.

Permits take time: start before you pick the month

The best month is useless if the permit isn’t ready. In Seattle, removal of a tree 6 inches or more in diameter has to be posted on the Department of Construction and Inspections website at least six full business days before the work, and a hired crew must be on the city’s tree service provider registry. In Portland, removing a healthy private tree 20 inches or more in diameter takes a Type B permit, which can involve notice posted at the site and 14-day windows for review and appeal (Portland City Code 11.40.050 and 11.30.050), and every Portland tree permit expires 90 days after it is issued unless it says otherwise (11.30.100). So time the permit to the season, not the other way round.

Rules in other cities are on Washington tree removal permits and Oregon tree removal permits. A tree that is an immediate hazard follows a different track; Portland, for one, has a separate emergency removal process for private trees.