When to Clean Gutters in Washington: A Fall Checklist
In Kitsap County, clean gutters at least twice a year: once in late fall, after the maples and alders have dropped their leaves (usually mid-November), and once in spring, after the fir needles, cones and pollen come down. Homes under big firs or cedars often need a third cleaning in late summer. Treat roof moss in early fall, before the long wet season.
Early fall (September to October)
The dry tail end of summer is the best time to get ahead of winter.
- Look at the roof from the street. Green or fuzzy patches on the north side are moss.
- Treat moss now, following the product label for weather, so the fall rains can work it in.
- Trim branches that hang over the roof. They drop the debris that clogs gutters.
- Check that downspouts drain away from the foundation, not against it.
Late fall (November)
Most Kitsap leaves are down by mid-November. This is the cleaning that matters most.
- Clear every gutter run by hand and bag the debris.
- Flush each downspout with a hose. If water backs up, the elbow is clogged.
- Watch the first big rain: water spilling over the edge means a clog or a sagging section.
- Re-seal leaking seams and tighten loose hangers before the storms.
- Hang holiday lights after the gutters are clean, not before.
Winter (December to February)
Atmospheric rivers show you exactly where the gutters fail.
- After a windstorm, look for branches in the gutters and lifted shingles.
- Check the ground under each downspout for washouts.
- Look for water stains on soffits and fascia, an early sign of rot.
Spring (April to May)
Firs and cedars shed needles, cones and pollen all spring.
- Clean the gutters again once the cones and catkins are down.
- Check whether last fall's moss treatment held. Dead moss turns brown or orange and lifts off.
- Book any fascia or trim repair while it's dry enough to paint.
Common questions
How often should gutters be cleaned in western Washington?
Twice a year for most homes, in late fall and spring. Three times a year if big firs or cedars hang over the roof.
Is it bad to pressure-wash moss off a roof?
Yes. Pressure washing strips the granules that protect asphalt shingles and can force water under them. Hand-removal and treatment is safer.
What happens if I skip a cleaning?
Overflowing gutters dump water against siding and foundations, rot fascia boards, and can freeze and pull loose in a cold snap.