When to plant in Pullman, WA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Pullman, Washington — all computed from Pullman's nearest NOAA weather station.
In zone 6b, Pullman gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
PULLMAN 2 NW · 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 Pullman’s own odds, recorded at PULLMAN 2 NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jul 1 | Jun 1 | May 12 | Aug 24 | Sep 11 | Sep 29 |
| 32°F | May 25 | May 6 | Apr 22 | Sep 9 | Sep 29 | Oct 15 |
| 28°F | May 7 | Apr 19 | Mar 27 | Sep 26 | Oct 12 | Nov 2 |
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 Pullman, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 35 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.
Pullman planting FAQ
When is the last spring frost in Pullman, WA?
On average, the last spring frost in Pullman is around May 6 (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 Pullman, WA?
Expect Pullman's first fall frost near September 29 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Pullman in?
Pullman is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Pullman?
Pullman has about 146 frost-free days — a short growing season — between the average last spring frost (May 6) and first fall frost (September 29).
When should I plant tomatoes in Pullman?
For Pullman, sow tomatoes indoors about March 11–March 25 and move the seedlings out around May 13, after the last spring frost.
Never miss a window in Pullman
An email when it’s time to start seeds, transplant, and sow — timed to Pullman’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Moscow · 13 km
- Lewiston · 40 km
- Cheney · 90 km
- Spokane Valley · 104 km
- Liberty Lake · 104 km
- Spokane · 106 km
- Airway Heights · 106 km
- Coeur d'Alene · 111 km
Frost dates recorded at PULLMAN 2 NW, 3 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 Pullman, WA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00456789. Retrieved from https://blissgarden.com/washington/pullman.