Most people book a chimney sweep the week they want to light the first fire. In Kirkland that tends to be mid-October, the same week as everyone else, and the same week the rain comes back. The sweep itself can happen any month of the year. What the timing decides is everything that comes after it: whether a cracked crown or a loose flashing strip found on the roof can be repaired in dry weather, whether the flue is clean before the first cold snap, and whether you are waiting in a queue. This guide covers the best window to book, what changes once the wet season starts, and the warning signs that justify calling in any month.
The dry window: mid-June to early October
WeatherSpark's model for Kirkland puts the clearer part of the year between roughly mid-June and early October, and July is the driest month at under an inch of rain on average. That is the stretch when a technician can work safely on a roof, and when mortar, crown mix and sealants can cure without being rained on the next morning.
A sweep booked in May, June or July uses that window twice. The flue is cleaned and inspected, and anything the inspection flags can be scheduled for August or September instead of being put off until spring.
What changes once the rain returns
The wet season in Kirkland starts around October 9 and runs to about May 1, according to the same model. For western Washington as a whole, the Western Regional Climate Center reports that rain or snow is often recorded on two-thirds or more of the days in December and January, while a winter month offers only four to eight days that are clear or partly cloudy.
None of that stops a sweep. It does limit what can follow it. Brushing out a flue and running a camera up it can be done in drizzle, but rebuilding a crown or re-bedding flashing needs dry masonry. A defect found in November may mean a tarp, a temporary seal, or a fireplace left cold until the weather turns.
Signs to call now, whatever the month
Some symptoms are not seasonal. Any of the ones below is reason enough to hold off on lighting another fire until a technician has been up.
| What you notice | What it can point to | What to do |
|---|---|---|
| Smoke rolling into the room | Blocked flue, a closed or broken damper, or buildup narrowing the flue | Stop burning and book a sweep with inspection |
| A sharp, tar-like odor on humid days | Creosote in the flue reacting with damp air | Book a sweep; heavy glazing may need removal |
| Flakes of black crust in the firebox | Creosote shedding from the flue walls | Book before lighting another fire |
| Rushing or roaring sound, or sparks from the top | A possible chimney fire | Get everyone out and call 911; inspect before reuse |
| Birds or scratching in the flue | Nesting or an animal inside, often with a missing cap | Do not light a fire; have the flue cleared and capped |
Burn bans and summer fire-safety bans
Winter air-quality bans from the Puget Sound Clean Air Agency govern when you can burn, not when you can service the chimney. Summer bans aimed at wildfire risk are issued separately, by the King and Snohomish county fire marshals; in 2026 the Governor went further and put the whole state under an emergency burn ban running August 1 to September 30, after a fourth straight year of statewide drought. A dry-season ban is actually a convenient time to have the chimney worked on, since you will not be using it anyway.
Before lighting the first fire of the autumn, check the Clean Air Agency's burn-ban status page or call its line at 800-595-4341.
What the visit includes
Every sweep we do comes with a Level 1 inspection of the readily accessible parts of the chimney, and the pair is priced together at $189 to $459. The upper end reflects steep roofs, tall stacks and heavier deposits. If the brushes leave a hard, glazed coating behind, removing it is a separate job on our creosote grid at $245 to $585.
You get the findings in writing with photos, so a repair can be planned during the dry weeks rather than discovered on a rainy one.
Frequently asked questions
Is fall a bad time to book a chimney sweep?
It is not bad for the sweep itself, but it is the busiest stretch, and any masonry or flashing repair the visit turns up then has to wait for a dry spell. Booking between late spring and August leaves room to fix what is found before the wet season.
Can a sweep still come if there is a burn ban in effect?
Yes. Clean Air Agency bans limit burning, not maintenance. Cleaning and inspecting a chimney is allowed on any day, ban or no ban.
I only burn a few fires a year. Do I still need to book annually?
The yearly inspection is still recommended, because rain and wind damage a chimney whether it is used or not. Brushing is only needed if the camera and flashlight turn up deposits; light use often means light deposits.
Sources
- WeatherSpark — Kirkland climate — accessed September 29, 2026
- Western Regional Climate Center — Climate of Washington — accessed September 29, 2026
- PSCAA — Burn ban status — accessed September 29, 2026
- WA Governor — 2026 statewide burn ban — accessed September 29, 2026
- CSIA — Homeowner Resources — accessed September 29, 2026
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