When to plant in Sedro-Woolley, WA
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Sedro-Woolley, Washington — all computed from Sedro-Woolley's nearest NOAA weather station.
In zone 8b, Sedro-Woolley supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
SEDRO-WOOLLEY · 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 Sedro-Woolley’s own odds, recorded at SEDRO-WOOLLEY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 11 | Apr 22 | Apr 1 | Oct 1 | Oct 17 | Nov 8 |
| 32°F | Apr 17 | Mar 27 | Mar 8 | Oct 15 | Nov 6 | Nov 28 |
| 28°F | Mar 22 | Mar 1 | Feb 2 | Nov 1 | Nov 24 | Dec 19 |
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 Sedro-Woolley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 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.
Sedro-Woolley planting FAQ
When is the last spring frost in Sedro-Woolley, WA?
Sedro-Woolley's average last spring frost falls near March 27 — 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 Sedro-Woolley, WA?
Expect Sedro-Woolley's first fall frost near November 6 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Sedro-Woolley in?
Sedro-Woolley is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Sedro-Woolley?
Sedro-Woolley has about 224 frost-free days — a long growing season — between the average last spring frost (March 27) and first fall frost (November 6).
When should I plant tomatoes in Sedro-Woolley?
For Sedro-Woolley, sow tomatoes indoors about January 30–February 13 and move the seedlings out around April 3, after the last spring frost.
Never miss a window in Sedro-Woolley
An email when it’s time to start seeds, transplant, and sow — timed to Sedro-Woolley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Burlington · 9 km
- Mount Vernon · 12 km
- Anacortes · 29 km
- Bellingham · 32 km
- Oak Harbor · 38 km
- Arlington · 38 km
- Camano · 43 km
- Ferndale · 46 km
Frost dates recorded at SEDRO-WOOLLEY, 2 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 Sedro-Woolley, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00457507. Retrieved from https://blissgarden.com/washington/sedro-woolley.