When to plant in Terrace Heights, WA
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Terrace Heights, Washington — all computed from Terrace Heights's nearest NOAA weather station.
In zone 7a, Terrace Heights 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 Terrace Heights is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
YAKIMA AIR TERMINAL · 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 Terrace Heights’s own odds, recorded at YAKIMA AIR TERMINAL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 16 | May 29 | May 9 | Sep 8 | Sep 23 | Oct 5 |
| 32°F | May 27 | May 8 | Apr 24 | Sep 23 | Oct 4 | Oct 17 |
| 28°F | May 8 | Apr 23 | Apr 6 | Oct 2 | Oct 16 | Nov 1 |
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 Terrace Heights, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Terrace Heights planting FAQ
When is the last spring frost in Terrace Heights, WA?
Plan for the last spring frost in Terrace Heights around May 8 (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 Terrace Heights, WA?
Expect Terrace Heights's first fall frost near October 4 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Terrace Heights in?
Terrace Heights is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Terrace Heights?
Terrace Heights has about 149 frost-free days — a short growing season — between the average last spring frost (May 8) and first fall frost (October 4).
When should I plant tomatoes in Terrace Heights?
For Terrace Heights, sow tomatoes indoors about March 13–March 27 and move the seedlings out around May 15, after the last spring frost.
Never miss a window in Terrace Heights
An email when it’s time to start seeds, transplant, and sow — timed to Terrace Heights’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Yakima · 9 km
- Ellensburg · 45 km
- Sunnyside · 46 km
- Grandview · 57 km
- West Richland · 86 km
- East Wenatchee · 92 km
- Wenatchee · 93 km
- Richland · 94 km
Frost dates recorded at YAKIMA AIR TERMINAL, 9 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 Terrace Heights, WA — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024243. Retrieved from https://blissgarden.com/washington/terrace-heights.