Douglas fir in Washington and Oregon yards

How big it gets, and how fast

OSU’s Landscape Plants database gives coast Douglas fir a mature height of 80–200 feet. The USDA Forest Service silvics manual describes typical old-growth trees at 60–72 inches in diameter and 250 feet tall, and the tallest measured specimen, near Little Rock, Washington, at 330 feet with a 71.6-inch trunk. Ages over 500 years are common; the oldest authenticated tree was a little over 1,400 years old.

In a yard the number that matters is growth rate. On a medium site the silvics manual puts height growth at about 24 inches a year at age 30, slowing to 6 inches a year by age 100. A fir planted as a 6-foot Christmas tree in 1985 is a 70–90 foot tree today, which is why so many 1980s subdivisions in Beaverton, Vancouver, Kent and Lacey now have removals in the “over 80 ft” cost bracket.

What its roots do

Given deep soil, Douglas fir grows a real taproot: the silvics manual reports taproots reaching about half their final depth in 3 to 5 years and 90 percent in 6 to 8 years. On shallow soil or where the water table sits high, the same species forms a platelike root system instead, and that is the version on most Puget Sound glacial till and Willamette Valley clay. Fine feeder roots concentrate in the top 8 inches.

Two consequences for homeowners. A plate-rooted fir on clay is windfirm until the soil is saturated, and then it is not. And the feeder roots under your lawn are the tree’s water supply; the NRCS plant guide says the species needs excellent drainage, and ODF rates its drought tolerance as only moderate, which is why trenching, grading and summer compaction show up as a thinning crown two or three years later.

The three ways a yard fir fails

Windthrow in saturated soil

The silvics manual records “heavy losses from blowdown in the Pacific Northwest” after heavy rain and wind, plus periodic damage from snow and ice storms. The sequence is familiar from every November to February: a week of rain fills the soil, a south wind arrives, and plate-rooted trees on wet ground or recently exposed edges go over with the root mass still attached. A fir that has stood in a grove and suddenly stands alone after neighbors were cleared is the highest-risk case. If one has already gone over, see fallen tree removal.

NOAA’s Storm Events Database shows how often that weather comes. From 1951 to mid-2026 it holds 3,042 High Wind reports for Oregon and 3,207 Heavy Snow reports for Washington, the most common event type in each state. These are report counts, not storms, and NOAA broadened what it records in 1996, so older years are thin. In the 2016–2026 records, about 79 percent of Washington and Oregon high-wind, strong-wind and ice-storm reports fell between November and March, and 89 percent between October and March. Since 1996, 20 storm deaths in the two states are recorded with the location “under tree.”

Laminated root rot

The silvics manual names laminated root rot and shoestring root rot as the principal pathogens of coast Douglas fir and a serious threat in young stands. Root rot is the failure mode that drops a green tree with its root ball in the air, often before any crown symptom. The signs, the 50–75 foot removal buffer and why the stumps have to come out are on laminated root rot.

Swiss needle cast in the Coast Range

Swiss needle cast (Phaeocryptopus gaeumannii) is specific to Douglas fir. ODF describes premature needle loss, thin crowns, yellowish foliage and rows of tiny black fruiting bodies on the needle undersides, with the worst damage on the low-elevation western flanks of the Coast Range in central and northern Oregon. ODF’s 2024 aerial survey mapped about 900,000 acres in Oregon, roughly 500,000 acres of affected Douglas fir; Washington’s 2024 coastal survey found about 49,500 symptomatic acres at normal or low levels. Growth losses run 20–55 percent, but ODF is clear that the disease “rarely kills trees.”

For a yard fir in Tillamook, Astoria or Aberdeen, needle cast is a reason for a thin crown, not a reason for removal. OSU’s EM 9352 recommends no Douglas fir at all in the near-coast zone and suggests hemlock, Sitka spruce, redcedar or red alder instead.

Pruning a Douglas fir: what helps and what harms

The USDA Forest Service’s homeowner pruning guide sorts trees by form, and Douglas fir is the textbook excurrent conifer: one strong central stem with whorled side branches that do not compete with it. Its rules for that form are short:

• Thinning is rarely needed. Conifers with whorled branches and pyramidal crowns seldom need crown thinning, except to restore a single leader after the top is damaged; pick the strongest leader and remove the competitors so a codominant stem does not form.
• Never crown-reduce it. The guide says crown reduction should never be used on a tree with a pyramidal form; when a fir has outgrown its space, the long-term answer is removal and a smaller replacement. Topping, which leaves weakly attached regrowth, is listed among the practices that harm trees.
• Raise with restraint. When lower limbs come off for clearance, keep live branches on at least two-thirds of the total height; a 90-foot fir should keep live crown on its upper 60 feet.
• Timing is flexible. Conifers can be pruned any time of year, but dormant-season cuts bleed less resin. Dead branches can come off whenever you see them.

Crown thinning and reduction belong to hardwoods such as bigleaf maple; the details are on crown thinning and reduction.

When a Douglas fir needs removal

A thin crown by itself is not on the list. Needle cast, drought stress and a bad pruning job all thin a fir without making it unsafe. The call is a structural one, and a certified arborist with a Tree Risk Assessment Qualification makes it with a mallet, a probe and sometimes a resistance drill; what that looks like is on tree risk assessment.

Why big firs are crane jobs

A 100-foot fir between two houses has no drop zone. Climbing it means rigging each section down through the canopy over a roof; a crane lifts each piece straight up and sets it on the street. Crews reach for the crane when the tree is in the over-80-foot bracket, when the trunk is too decayed to climb, or when the only flat parking is the street. The sequence, the street-use permits and the operator’s rules are on crane tree removal, and the full picture of big-tree jobs is on large tree removal.

The weight is the reason. The USDA Forest Service’s FIA species reference table gives Douglas fir a wood specific gravity of 0.45 and a dry-to-green weight factor of 1.43, which works out to roughly 40 pounds per cubic foot of fresh-cut wood, half again as heavy as western redcedar. A 10-foot section of 30-inch trunk holds about 49 cubic feet, so close to a ton in one pick. A Mississippi State University Extension risk worksheet makes the same point as a general rule: stems 16–30 inches across weigh 2–10 tons, and stems over 30 inches more than 10.

Modeled estimate, not quotes (method): a removal over 80 feet models at 14–30 crew-hours, $3,150–$6,750 in Oregon and $2,950–$6,300 in Washington, with chipping and haul-away but no stump. A crane day adds $1,500–$3,500 for the operator and mobilization, and a trunk within 10 feet of a structure multiplies the base by 1.25. Stump grinding on a 30-inch fir adds roughly $150–$450. Current numbers are on tree removal cost.

Heritage, landmark and big-tree rules that catch Douglas firs

Most mature firs are over 24 inches in diameter, and 24 inches is where several city codes change gear.

City-by-city thresholds, fees and who issues the permit are in Oregon tree removal permits and Washington tree removal permits. A dead or hazardous fir is the easy case almost everywhere; a healthy 30-inch fir you simply want gone is the hard one, and in Portland or Seattle it may not be allowed.

Next steps

1. After a wet storm, walk the uphill side of each big fir and look for lifted soil, new cracks or a changed lean.
2. Get a written risk assessment if you see any of the removal triggers above; it is also what the city wants attached to a hazard permit.
3. Check the permit tier for your city before you book, because a 24-inch fir is often a landmark tree.
4. Ask about the crane early; the operator, not the tree crew, sets that part of the price.
5. Check the crew at L&I’s Verify tool in Washington or the CCB and LCB lookups in Oregon.

Everything from permits to price is collected under tree removal; the other species pages are under trees.

To estimate the age of a fir in your yard, see how old is my tree.