When to plant in Snohomish, WA
USDA Zone 8bSnohomish, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 8b means many perennials and even some tender shrubs overwinter in Snohomish, while your frost dates still decide when annuals go out.
The average last spring frost in Snohomish is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
EVERETT · 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 Snohomish’s own odds, recorded at EVERETT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 8 | Apr 20 | Mar 31 | Oct 1 | Oct 18 | Nov 4 |
| 32°F | Apr 11 | Mar 24 | Mar 4 | Oct 16 | Nov 2 | Nov 23 |
| 28°F | Mar 20 | Mar 1 | Jan 31 | Oct 29 | Nov 21 | Dec 14 |
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 Snohomish, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 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.
Snohomish planting FAQ
When is the last spring frost in Snohomish, WA?
Plan for the last spring frost in Snohomish around March 24 (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 Snohomish, WA?
The first fall frost in Snohomish typically arrives around November 2 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Snohomish in?
Snohomish is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Snohomish?
There are roughly 223 frost-free days in Snohomish (a long growing season), running from the average last frost around March 24 to the first fall frost near November 2.
When should I plant tomatoes in Snohomish?
In Snohomish, start tomato seeds indoors around January 27–February 10, then transplant seedlings outdoors around March 31 once the danger of frost has passed.
Never miss a window in Snohomish
An email when it’s time to start seeds, transplant, and sow — timed to Snohomish’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Eastmont · 7 km
- Lake Stevens · 8 km
- Everett · 8 km
- Silver Firs · 8 km
- Monroe · 11 km
- Mill Creek · 11 km
- Mill Creek East · 13 km
- Lake Stickney · 13 km
Frost dates recorded at EVERETT, 9 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 Snohomish, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00452675. Retrieved from https://blissgarden.com/washington/snohomish.