When to plant in Prineville, OR
USDA Zone 6bPrineville, Oregon frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Prineville's growing season is short at roughly 113 days, so succession planting is limited; lean on transplants over direct sowing for anything slow to mature. In zone 6b, Prineville gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Prineville is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
PRINEVILLE · 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 Prineville’s own odds, recorded at PRINEVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jul 8 | Jun 19 | May 31 | Aug 15 | Sep 4 | Sep 23 |
| 32°F | Jun 22 | Jun 1 | May 8 | Aug 31 | Sep 22 | Oct 9 |
| 28°F | Jun 1 | May 5 | Apr 19 | Sep 18 | Oct 8 | Oct 27 |
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 Prineville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 43 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.
Prineville planting FAQ
When is the last spring frost in Prineville, OR?
Prineville's average last spring frost falls near June 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 Prineville, OR?
The first fall frost in Prineville typically arrives around September 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Prineville in?
Prineville 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 Prineville?
Prineville has about 113 frost-free days — a short growing season — between the average last spring frost (June 1) and first fall frost (September 22).
When should I plant tomatoes in Prineville?
For Prineville, sow tomatoes indoors about April 6–April 20 and move the seedlings out around June 8, after the last spring frost.
Never miss a window in Prineville
An email when it’s time to start seeds, transplant, and sow — timed to Prineville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Redmond · 26 km
- Bend · 45 km
- The Dalles · 146 km
- Sweet Home · 147 km
- Lebanon · 165 km
- Sandy · 165 km
- Molalla · 166 km
- Silverton · 171 km
Frost dates recorded at PRINEVILLE, 2 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 Prineville, OR — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00356883. Retrieved from https://blissgarden.com/oregon/prineville.