When to plant in Bellevue, WA
USDA Zone 9aBellevue, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Bellevue enjoys a long ~260-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 9a, frost is a minor factor for Bellevue — most perennials thrive, and annual vegetables can go out early and stay late.
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 Bellevue’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 Bellevue, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Bellevue planting FAQ
When is the last spring frost in Bellevue, WA?
Plan for the last spring frost in Bellevue 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 Bellevue, WA?
In Bellevue, the first 32°F freeze of fall lands around November 23 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Bellevue in?
Bellevue is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Bellevue?
Bellevue 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 Bellevue?
For Bellevue, 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 Bellevue
An email when it’s time to start seeds, transplant, and sow — timed to Bellevue’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Mercer Island · 7 km
- Newcastle · 7 km
- Sammamish · 9 km
- Redmond · 9 km
- Issaquah · 10 km
- Kirkland · 12 km
- Bryn Mawr-Skyway · 13 km
- Renton · 13 km
Frost dates recorded at SEATTLE SAND PT WSFO, 12 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 Bellevue, WA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094290. Retrieved from https://blissgarden.com/washington/bellevue.