When to plant in Maltby, WA
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Maltby, Washington — all computed from Maltby's nearest NOAA weather station.
In zone 8b, Maltby supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average last spring frost in Maltby is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
MONROE · 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 Maltby’s own odds, recorded at MONROE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 5 | Apr 20 | Sep 21 | Oct 6 | Oct 25 |
| 32°F | May 7 | Apr 17 | Mar 29 | Oct 7 | Oct 23 | Nov 9 |
| 28°F | Apr 14 | Mar 26 | Mar 6 | Oct 20 | Nov 8 | Nov 26 |
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 Maltby, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Maltby planting FAQ
When is the last spring frost in Maltby, WA?
On average, the last spring frost in Maltby is around April 17 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Maltby, WA?
The first fall frost in Maltby typically arrives around October 23 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Maltby in?
Maltby is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Maltby?
Maltby has about 189 frost-free days — a moderate growing season — between the average last spring frost (April 17) and first fall frost (October 23).
When should I plant tomatoes in Maltby?
For Maltby, sow tomatoes indoors about February 20–March 6 and move the seedlings out around April 24, after the last spring frost.
Never miss a window in Maltby
An email when it’s time to start seeds, transplant, and sow — timed to Maltby’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Woodinville · 6 km
- Bothell East · 6 km
- Cottage Lake · 7 km
- Mill Creek East · 7 km
- Silver Firs · 8 km
- Bothell · 8 km
- Bothell West · 10 km
- Mill Creek · 10 km
Frost dates recorded at MONROE, 10 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 Maltby, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00455525. Retrieved from https://blissgarden.com/washington/maltby.