When to plant in Sunnyside, WA
USDA Zone 7bSunnyside, 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, Sunnyside 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 Sunnyside is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SUNNYSIDE · 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 Sunnyside’s own odds, recorded at SUNNYSIDE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 7 | May 16 | May 1 | Sep 10 | Sep 25 | Oct 7 |
| 32°F | May 18 | May 1 | Apr 16 | Sep 25 | Oct 6 | Oct 22 |
| 28°F | May 1 | Apr 15 | Mar 28 | Oct 5 | Oct 19 | Nov 4 |
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 Sunnyside, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 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.
Sunnyside planting FAQ
When is the last spring frost in Sunnyside, WA?
Sunnyside's average last spring frost falls near May 1 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Sunnyside, WA?
In Sunnyside, the first 32°F freeze of fall lands around October 6 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Sunnyside in?
Sunnyside 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 Sunnyside?
Sunnyside has about 158 frost-free days — a moderate growing season — between the average last spring frost (May 1) and first fall frost (October 6).
When should I plant tomatoes in Sunnyside?
For Sunnyside, sow tomatoes indoors about March 6–March 20 and move the seedlings out around May 8, after the last spring frost.
Never miss a window in Sunnyside
An email when it’s time to start seeds, transplant, and sow — timed to Sunnyside’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Grandview · 11 km
- Terrace Heights · 46 km
- West Richland · 47 km
- Yakima · 52 km
- Richland · 55 km
- Kennewick · 65 km
- Pasco · 68 km
- Hermiston · 77 km
Frost dates recorded at SUNNYSIDE, 1 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 Sunnyside, WA — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00458207. Retrieved from https://blissgarden.com/washington/sunnyside.