The short version. Book the main clean any time from late October through January — once the needle drop is under way and before the wettest stretch has done its worst. Late November into December is the sweet spot, but the season is wide. Under mature Douglas fir on a north-facing lot, book twice: one in the autumn, one in spring.
The city switches its own street sweepers to leaf-season mode in the third week of October. That is a fair signal for your roof as well.
Call (253) 366-8066 and we’ll connect you with a licensed local specialist who works Tacoma.
Why Tacoma is harder than the advice you will find
detached homes in Tacoma, and 95% of them have a roof moss grows on — composition shingle or wood shake.
Pierce County Assessor, Aug 2026of those roofs sit on homes built before 1990. Across Pierce County as a whole it is 54%.
Pierce County Assessor, Aug 2026Tacoma’s tree canopy today, and the city’s target for 2030. The shade is being added to, not removed.
City of Tacoma Urban Forestryof the year’s rain falls November through January, landing on top of the needle drop.
NOAA normals 1991–2020Almost every gutter article you will read says “spring and fall.” That advice was written for maple country, and Tacoma is not maple country. Douglas fir and western red cedar shed needles, and needles behave nothing like leaves: they do not blow off a roof in a gust, they knit into a mat in the valleys and then slide into the gutter all at once.
The USDA Forest Service measured Douglas fir litterfall across thirteen years. The drop peaks in October, about half the annual load falls in October and November, and the minimum is April — which is exactly when the standard advice sends you up a ladder.
The Tacoma calendar
Douglas fir litterfall (USDA Forest Service PNW-14) against Tacoma monthly precipitation (NOAA 1991–2020). Tacoma sweeps residential streets on a fixed schedule January through October, then switches to flexible leaf-season sweeping from the third week of October.
What is actually going through them
More than most people picture, and we can be specific about Tacoma rather than guessing. Across 44,799 pre-1990 Tacoma homes with a moss-susceptible roof, the median roof footprint is about 1,048 square feet — which puts roughly 660 gallons through the gutters for every inch of rain that falls on it.
| Period | Rainfall | Through the gutters |
|---|---|---|
| One inch of rain | 1.00 in | 660 gal |
| November alone | 6.68 in | 4,400 gal |
| November – January | 18.10 in | 11,800 gal |
| Full year | 39.22 in | 25,600 gal |
Footprint is recorded floor area divided by story count, from the county tax roll; gallons are footprint × inches × 0.623. An attached garage is not carried in floor area, so treat these as a floor rather than a ceiling. Tacoma is unusual in that the figure barely moves with the number of stories — its two-story homes are larger inside but sit on a slightly smaller footprint.
When that cannot get through, it goes over the front edge and lands in a narrow strip against the foundation — at the time of year the ground is already saturated and least able to take it. The Department of Energy’s guidance is to discharge at least five feet out from the foundation for exactly this reason, and Washington is crawl-space country: moisture under the floor does not stay under the floor.
Where the debris goes
In Tacoma, debris handling is part of the job. Gutter debris cleared by hand, bagged, and taken away on the truck stays out of the street and out of the storm drains — and here that matters more than in most places.
The city is explicit that keeping the street clear of yard waste is the resident’s responsibility, because debris in the street clogs storm drains and causes flooding. Tacoma’s own campaign line for it is If It Hits the Ground, It Hits the Sound.
- Debris cleared by hand, bagged, and taken away on the truck — keeping it out of the downspouts and out of the storm drains
- Downspouts checked and cleared, all the way through to the outlet
- Flow tested with water once the debris is out
- Fasteners and pitch checked — gutters should fall at least a sixteenth of an inch per foot toward the outlet
- Roof valleys cleared of needle build-up, which is where the next gutter-full comes from
- Discharge point confirmed — water landing well clear of the foundation, not beside it
Where we work in Tacoma
Across the city, with the older tree-shaded parts of the North End and West End the ones that need it most often.
Get it booked before the rain sets in
Tell us your neighborhood and roughly what is above your roof. We will connect you with a licensed local specialist who works Tacoma — no cost to you, no obligation, and no call center.
Call (253) 366-8066Get a Free Quote Cascade Roof & Gutter is not a contractor and does not perform work. We connect Pierce County homeowners with independent licensed specialists.Nearby
We cover the whole of Pierce County. If you are closer to one of these, start there:
Sources
- Reukema, D.L. (1964), Litter fall in a young Douglas-fir stand as influenced by thinning, USDA Forest Service Research Note PNW-14.
- NOAA NCEI, U.S. Climate Normals 1991–2020, Tacoma No. 1 (GHCND:USC00458278) — 39.22 in annual, November 6.68 in.
- City of Tacoma, Urban Forestry Program — canopy cover approximately 20%, goal 30% by 2030.
- City of Tacoma Environmental Services, Street Sweeping — residential schedule and leaf-season sweeping from the third week of October.
- U.S. Census Bureau, American Community Survey B25034 / B25035 — Tacoma year structure built.
- University of Nebraska–Lincoln Extension G2220 — roof runoff calculation (area × inches × 0.623).
- US Department of Energy, Building America Solution Center — gutters, downspouts and crawl spaces.
- Pierce County Assessor-Treasurer, improvement_builtas and tax_account extracts, August 2026, joined on parcel number — 56,762 Tacoma single-family detached homes, roof cover, year built and floor area.
- Pierce County 2025 Tax Rates for Incorporated and Unincorporated Areas — tax code area to city mapping.