The short version. Gutters come clear between late October and January, once the needle drop is under way. Moss comes off on any dry day from October through May, and spring is when the results show fastest. Both are seasons rather than dates — there is more room in the year than most advice suggests.
Call (253) 366-8066 and we’ll connect you with a licensed local specialist who works Sumner.
What Sumner is working with
the median year a Sumner detached home was built. 40% of them predate 1960.
Pierce County Assessor, Aug 2026of Sumner’s 2,450 detached homes have a roof moss grows on.
Pierce County Assessor, Aug 2026through the gutters for every inch of rain that lands on a typical roof here.
Pierce County Assessor, Aug 2026of the year’s rain falls between November and January at the nearest long-record station, which has been measuring since 1941.
NOAA normals 1991–2020, McMillin ReservoirA valley-floor town platted in 1883, where two in five detached homes predate 1960 and the rivers on either side keep the air damp well into spring.
The Sumner year
The two jobs
Gutter cleaning in Sumner
When to book it, what a thorough visit includes, the 31,300 gallons a year a typical Sumner roof sheds, and where the debris is supposed to go.
Read the page →Roof moss removal in Sumner
Which stage your roof is at, what a treatment actually involves, how much product a Sumner roof takes, and the license behind the work.
Read the page →The background, if you want it
These are county-wide and go deeper than the two pages above. None of them are required reading before you call.
- Does moss actually damage your roof? Moss, algae and lichen are three different things and only one of them matters. Includes a five-stage scale so you can place your own roof.
- When should you treat roof moss? A dry day between October and May, and why spring is when the results show fastest.
- Does your contractor need a license? Washington law treats your roof as “land,” which puts moss treatment under the Pesticide Application Act. Most people are surprised.
- Do gutter guards actually work? Yes — when the type matches your trees. The evidence for guards in conifer country, and how the right one gets chosen.
Where we work in Sumner
Not sure which one you need?
Tell us your neighborhood and roughly what is above the roof. We will tell you what to do and when to book it, then connect you with a licensed local specialist who works Sumner. 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
Cascade covers all of Pierce County. The nearest other guides:
Sources
- Pierce County Assessor-Treasurer, improvement_builtas and tax_account extracts, August 2026, joined on parcel number — 2,450 Sumner single-family detached homes, roof cover, year built and floor area.
- NOAA NCEI, U.S. Climate Normals 1991–2020, McMillin Reservoir — 43.49 in annual, 7.06 in November.
- Reukema, D.L. (1964), USDA Forest Service Research Note PNW-14 — Douglas fir litterfall by month.
- Sumner Municipal Code § 13.48.820 — illicit discharges and connections prohibited; abatement billed to the owner.
- NOAA NCEI, U.S. Climate Normals 1991–2020, McMillin Reservoir — 43.49 in annual; record from March 1941.
- U.S. Army Corps of Engineers, Mud Mountain Dam — flood risk management for the lower White and Puyallup valleys.