When to plant in Richland, WA
USDA Zone 7bRichland, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7b means many perennials and even some tender shrubs overwinter in Richland, while your frost dates still decide when annuals go out.
Frost probability
RICHLAND · 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 Richland’s own odds, recorded at RICHLAND.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 8 | Apr 25 | Apr 11 | Sep 30 | Oct 14 | Oct 27 |
| 32°F | Apr 24 | Apr 6 | Mar 22 | Oct 10 | Oct 24 | Nov 8 |
| 28°F | Apr 5 | Mar 18 | Mar 1 | Oct 20 | Nov 4 | Nov 23 |
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 Richland, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Richland planting FAQ
When is the last spring frost in Richland, WA?
Plan for the last spring frost in Richland around April 6 (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 Richland, WA?
The first fall frost in Richland typically arrives around October 24 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Richland in?
Richland 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 Richland?
There are roughly 201 frost-free days in Richland (a moderate growing season), running from the average last frost around April 6 to the first fall frost near October 24.
When should I plant tomatoes in Richland?
In Richland, start tomato seeds indoors around February 9–February 23, then transplant seedlings outdoors around April 13 once the danger of frost has passed.
Never miss a window in Richland
An email when it’s time to start seeds, transplant, and sow — timed to Richland’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- West Richland · 8 km
- Kennewick · 13 km
- Pasco · 13 km
- Grandview · 48 km
- Hermiston · 50 km
- Sunnyside · 55 km
- Pendleton · 77 km
- Walla Walla · 78 km
Frost dates recorded at RICHLAND, 4 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 Richland, WA — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00457015. Retrieved from https://blissgarden.com/washington/richland.