When to plant in Birch Bay, WA
USDA Zone 8bBirch Bay, 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 8b, Birch Bay supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
BLAINE · 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 Birch Bay’s own odds, recorded at BLAINE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 12 | Apr 23 | Apr 1 | Oct 4 | Oct 20 | Nov 6 |
| 32°F | Apr 22 | Mar 31 | Mar 8 | Oct 18 | Nov 4 | Nov 24 |
| 28°F | Mar 31 | Mar 5 | Feb 2 | Oct 30 | Nov 19 | Dec 16 |
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 Birch Bay, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 29 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.
Birch Bay planting FAQ
When is the last spring frost in Birch Bay, WA?
Plan for the last spring frost in Birch Bay around March 31 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Birch Bay, WA?
Expect Birch Bay's first fall frost near November 4 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Birch Bay in?
Birch Bay is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Birch Bay?
Birch Bay has about 218 frost-free days — a long growing season — between the average last spring frost (March 31) and first fall frost (November 4).
When should I plant tomatoes in Birch Bay?
For Birch Bay, sow tomatoes indoors about February 3–February 17 and move the seedlings out around April 7, after the last spring frost.
Never miss a window in Birch Bay
An email when it’s time to start seeds, transplant, and sow — timed to Birch Bay’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Ferndale · 14 km
- Lynden · 21 km
- Bellingham · 28 km
- Anacortes · 49 km
- Sedro-Woolley · 59 km
- Burlington · 59 km
- Mount Vernon · 65 km
- Oak Harbor · 71 km
Frost dates recorded at BLAINE, 7 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 Birch Bay, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00450729. Retrieved from https://blissgarden.com/washington/birch-bay.