When to plant in Bothell, WA
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Bothell, Washington — is derived from the closest NOAA station with complete climate normals.
With about 260 frost-free days, Bothell supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 8b, Bothell supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
SEATTLE SAND PT WSFO · 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 Bothell’s own odds, recorded at SEATTLE SAND PT WSFO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 26 | Apr 4 | Mar 17 | Oct 24 | Nov 5 | Nov 22 |
| 32°F | Mar 29 | Mar 8 | Feb 13 | Nov 4 | Nov 23 | Dec 16 |
| 28°F | Mar 1 | Feb 11 | Dec 27 | Nov 17 | Dec 11 | Jan 17 |
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 Bothell, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Bothell planting FAQ
When is the last spring frost in Bothell, WA?
Plan for the last spring frost in Bothell around March 8 (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 Bothell, WA?
The first fall frost in Bothell typically arrives around November 23 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Bothell in?
Bothell is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Bothell?
Bothell has about 260 frost-free days — a long growing season — between the average last spring frost (March 8) and first fall frost (November 23).
When should I plant tomatoes in Bothell?
For Bothell, sow tomatoes indoors about January 11–January 25 and move the seedlings out around March 15, after the last spring frost.
Never miss a window in Bothell
An email when it’s time to start seeds, transplant, and sow — timed to Bothell’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bothell East · 4 km
- Kenmore · 4 km
- Bothell West · 4 km
- Woodinville · 5 km
- Alderwood Manor · 7 km
- Lake Forest Park · 7 km
- Mill Creek East · 7 km
- Mountlake Terrace · 8 km
Frost dates recorded at SEATTLE SAND PT WSFO, 10 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 Bothell, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094290. Retrieved from https://blissgarden.com/washington/bothell.