When to plant in Mukilteo, WA
USDA Zone 8bMukilteo, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
With about 253 frost-free days, Mukilteo supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 8b, Mukilteo supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
EVERETT SNOHOMISH 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 Mukilteo’s own odds, recorded at EVERETT SNOHOMISH AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 27 | Apr 3 | Mar 15 | Oct 19 | Nov 2 | Nov 20 |
| 32°F | Mar 29 | Mar 9 | Feb 15 | Oct 31 | Nov 17 | Dec 7 |
| 28°F | Mar 9 | Feb 13 | Jan 1 | Nov 15 | Dec 6 | Jan 8 |
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 Mukilteo, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Mukilteo planting FAQ
When is the last spring frost in Mukilteo, WA?
Plan for the last spring frost in Mukilteo around March 9 (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 Mukilteo, WA?
Expect Mukilteo's first fall frost near November 17 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Mukilteo in?
Mukilteo is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Mukilteo?
Mukilteo has about 253 frost-free days — a long growing season — between the average last spring frost (March 9) and first fall frost (November 17).
When should I plant tomatoes in Mukilteo?
For Mukilteo, sow tomatoes indoors about January 12–January 26 and move the seedlings out around March 16, after the last spring frost.
Never miss a window in Mukilteo
An email when it’s time to start seeds, transplant, and sow — timed to Mukilteo’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Picnic Point · 4 km
- Lake Stickney · 6 km
- North Lynnwood · 7 km
- Mill Creek · 9 km
- Eastmont · 9 km
- Martha Lake · 9 km
- Lynnwood · 9 km
- Everett · 10 km
Frost dates recorded at EVERETT SNOHOMISH AP, 2 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 Mukilteo, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024222. Retrieved from https://blissgarden.com/washington/mukilteo.