When to plant in Washougal, WA
USDA Zone 9aWashougal, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 9a, frost is a minor factor for Washougal — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
TROUTDALE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Washougal’s own odds, recorded at TROUTDALE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 9 | Apr 24 | Apr 3 | Oct 11 | Oct 30 | Nov 21 |
| 32°F | Apr 21 | Mar 26 | Feb 27 | Oct 26 | Nov 17 | Dec 10 |
| 28°F | Mar 21 | Feb 22 | Jan 15 | Nov 14 | Dec 7 | Jan 11 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Washougal, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Washougal planting FAQ
When is the last spring frost in Washougal, WA?
Washougal's average last spring frost falls near March 26 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Washougal, WA?
The first fall frost in Washougal typically arrives around November 17 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Washougal in?
Washougal is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Washougal?
Washougal has about 236 frost-free days — a long growing season — between the average last spring frost (March 26) and first fall frost (November 17).
When should I plant tomatoes in Washougal?
For Washougal, sow tomatoes indoors about January 29–February 12 and move the seedlings out around April 2, after the last spring frost.
Never miss a window in Washougal
An email when it’s time to start seeds, transplant, and sow — timed to Washougal’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at TROUTDALE, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Washougal, WA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00358634. Retrieved from https://blissgarden.com/washington/washougal.