When to plant in Burien, WA
USDA Zone 9aBurien, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Burien enjoys a long ~266-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Zone 9a is warm enough that Burien can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Burien is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SEATTLE TACOMA INTL AP · 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 Burien’s own odds, recorded at SEATTLE TACOMA INTL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Mar 31 | Mar 13 | Oct 24 | Nov 7 | Nov 23 |
| 32°F | Mar 23 | Mar 2 | Feb 5 | Nov 6 | Nov 23 | Dec 15 |
| 28°F | Feb 28 | Feb 4 | Dec 20 | Nov 17 | Dec 10 | Jan 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 Burien, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Burien planting FAQ
When is the last spring frost in Burien, WA?
Burien's average last spring frost falls near March 2 — 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 Burien, WA?
In Burien, 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 Burien in?
Burien is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Burien?
There are roughly 266 frost-free days in Burien (a long growing season), running from the average last frost around March 2 to the first fall frost near November 23.
When should I plant tomatoes in Burien?
In Burien, start tomato seeds indoors around January 5–January 19, then transplant seedlings outdoors around March 9 once the danger of frost has passed.
Never miss a window in Burien
An email when it’s time to start seeds, transplant, and sow — timed to Burien’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- White Center · 4 km
- SeaTac · 5 km
- Tukwila · 5 km
- Bryn Mawr-Skyway · 8 km
- Des Moines · 10 km
- Renton · 11 km
- Mercer Island · 13 km
- Kent · 14 km
Frost dates recorded at SEATTLE TACOMA INTL AP, 4 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 Burien, WA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024233. Retrieved from https://blissgarden.com/washington/burien.