When to plant in Arlington, WA
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Arlington, Washington — is derived from the closest NOAA station with complete climate normals.
In zone 8b, Arlington supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
ARLINGTON · 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 Arlington’s own odds, recorded at ARLINGTON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 10 | Apr 28 | Sep 17 | Oct 2 | Oct 17 |
| 32°F | May 6 | Apr 22 | Apr 4 | Oct 3 | Oct 19 | Nov 4 |
| 28°F | Apr 15 | Mar 25 | Mar 3 | Oct 19 | Nov 3 | Nov 23 |
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 Arlington, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 31 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.
Arlington planting FAQ
When is the last spring frost in Arlington, WA?
Plan for the last spring frost in Arlington around April 22 (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 Arlington, WA?
Expect Arlington's first fall frost near October 19 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Arlington in?
Arlington is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Arlington?
Arlington has about 180 frost-free days — a moderate growing season — between the average last spring frost (April 22) and first fall frost (October 19).
When should I plant tomatoes in Arlington?
For Arlington, sow tomatoes indoors about February 25–March 11 and move the seedlings out around April 29, after the last spring frost.
Never miss a window in Arlington
An email when it’s time to start seeds, transplant, and sow — timed to Arlington’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Marysville · 10 km
- Lake Stevens · 19 km
- Everett · 23 km
- Camano · 24 km
- Snohomish · 27 km
- Mount Vernon · 30 km
- Eastmont · 30 km
- Mukilteo · 31 km
Frost dates recorded at ARLINGTON, 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 Arlington, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00450257. Retrieved from https://blissgarden.com/washington/arlington.