# Issaquah's Windstorm Season Is Coming: A Pre-Winter Roof Checklist | Roofing Issaquah

> Issaquah's Nov–Feb windstorm season brings the year's heaviest rain and wind. A practical pre-season roof checklist for Issaquah and Eastside King County homeowners.

URL: https://roofingissaquah.com/blog/issaquah-windstorm-season-roof-checklist/

Issaquah's wettest, windiest months run November through February. Here's what's worth checking before the first big storm hits — and what can wait.

Every fall, the same pattern repeats across the Eastside: a stretch of dry, quiet weather through summer, then a run of Pacific windstorms starting in November that doesn't really let up until February. If you own a home in Issaquah, that window is worth a few minutes of roof attention before it arrives — not after the first branch comes down.

## Why Issaquah's storm season is a bigger deal here than in flatter Puget Sound cities

Issaquah sits at the base of the Cascade foothills, hemmed in on three sides by Cougar Mountain, Squak Mountain, and Tiger Mountain. That geography pulls more moisture out of Pacific storm systems than flatter cities like Seattle or Federal Way see — Issaquah averages roughly 60–65 inches of rain a year, well above Seattle's totals. November alone typically brings around 9.3 inches of rain across about 23 rainy days, making it the wettest month of the year here by a wide margin.

That combination — heavy rain plus a heavily wooded canopy right up against most neighborhoods — means two things happen at once during storm season: wind load on the roof itself, and wind load on the trees hanging over it.

## What to check before the season starts

**Gutters and downspouts.** A gutter clogged with needles and leaves backs water up under the shingle edge during a heavy rain event instead of carrying it away. Clear them now, not mid-storm.

**Flashing around penetrations.** Chimneys, vent pipes, and skylights are the most common places a roof actually leaks — not the open field of shingles. A visual check (or a professional one, if your roof is steep or you're not comfortable on a ladder) catches lifted or corroded flashing before wind-driven rain finds it.

**Moss buildup.** Moss holds moisture against the roof surface and, over time, works its way under shingle tabs and shakes. It's a slower problem than a windstorm, but going into the wettest months with heavy moss coverage makes everything else worse. If you haven't had moss treated in a while, this is the season to deal with it.

**Overhanging limbs.** This isn't a roofing-company line item, but it belongs on the list: dead or overextended branches from the trees bordering Cougar, Squak, or Tiger Mountain neighborhoods are a real and recurring cause of storm-season roof damage here. A branch through a roof deck is a different repair than a worn shingle.

**Attic-side signs of prior leaks.** Water stains, dark streaking, or a musty smell in the attic are worth investigating before winter adds volume to whatever's already getting in.

## Wind damage vs. moss damage — why the distinction matters this time of year

If a windstorm does cause damage, whether your homeowners insurance covers it typically comes down to one distinction: sudden wind damage is usually covered, while gradual deterioration from moss or neglect usually isn't. That's worth knowing before you're standing in the yard after a storm trying to figure out what to do next — we cover it in more detail in [does homeowners insurance cover windstorm roof damage in Washington](/guide/does-insurance-cover-windstorm-roof-damage-washington/) and in [what to do if your roof is leaking after a windstorm](/guide/roof-leaking-after-windstorm-what-to-do/).

## The bottom line

None of this requires a full inspection appointment if your roof is in reasonable shape — a walk-around, a pair of binoculars, and a look in the attic covers most of it. But if it's been more than a couple of years since anyone actually looked at your roof, or if you're seeing visible moss, worn flashing, or attic staining, doing that before November beats doing it after a leak starts. Call [(425) 642-1901](tel:+14256421901) for a free on-site look before storm season sets in.