When to plant in Pasco, WA
USDA Zone 7bPasco, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 7b, Pasco supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
PASCO TRI CITIES 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 Pasco’s own odds, recorded at PASCO TRI CITIES AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 23 | May 9 | Apr 27 | Sep 15 | Sep 29 | Oct 13 |
| 32°F | May 10 | Apr 27 | Apr 8 | Sep 28 | Oct 11 | Oct 27 |
| 28°F | Apr 28 | Apr 7 | Mar 20 | Oct 6 | Oct 23 | Nov 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 Pasco, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 12 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.
Pasco planting FAQ
When is the last spring frost in Pasco, WA?
On average, the last spring frost in Pasco is around April 27 (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 Pasco, WA?
In Pasco, the first 32°F freeze of fall lands around October 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Pasco in?
Pasco is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Pasco?
Pasco has about 167 frost-free days — a moderate growing season — between the average last spring frost (April 27) and first fall frost (October 11).
When should I plant tomatoes in Pasco?
For Pasco, sow tomatoes indoors about March 2–March 16 and move the seedlings out around May 4, after the last spring frost.
Never miss a window in Pasco
An email when it’s time to start seeds, transplant, and sow — timed to Pasco’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Kennewick · 9 km
- Richland · 13 km
- West Richland · 21 km
- Hermiston · 50 km
- Grandview · 61 km
- Walla Walla · 64 km
- Sunnyside · 68 km
- Pendleton · 70 km
Frost dates recorded at PASCO TRI CITIES AP, 0 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 Pasco, WA — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024163. Retrieved from https://blissgarden.com/washington/pasco.