Frost dates for Prineville, OR
At Prineville, the median last spring frost (32°F) is Jun 1 and the median first fall frost is Sep 22, for a typical growing season of 113 days. For a 90% chance that the last frost has passed, wait until Jun 22. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Jun 1Last spring frost (median)50% chance of 32°F after this date
- Jun 22Safer planting date10% chance of 32°F after this date
- Sep 22First fall frost (median)50% chance of 32°F by this date
- 113 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 31 | Jun 19 | Jul 8 |
| 32°F | May 8 | Jun 1 | Jun 22 |
| 28°F | Apr 19 | May 5 | Jun 1 |
| 24°F | Mar 30 | Apr 18 | May 6 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Aug 15 | Sep 4 | Sep 23 |
| 32°F | Aug 31 | Sep 22 | Oct 9 |
| 28°F | Sep 18 | Oct 8 | Oct 27 |
| 24°F | Oct 5 | Oct 24 | Nov 14 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 51 days | 77 days | 103 days |
| 32°F | 83 days | 113 days | 142 days |
| 28°F | 122 days | 153 days | 178 days |
| 24°F | 159 days | 186 days | 216 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97753 | 6b | -5 to 0°F | 16 km |
| 97756 | 6b | -5 to 0°F | 28 km |
| 97754 | 6b | -5 to 0°F | 32 km |
| 97760 | 6b | -5 to 0°F | 34 km |
| 97701 | 6b | -5 to 0°F | 37 km |
| 97741 | 7a | 0 to 5°F | 43 km |
| 97703 | 6b | -5 to 0°F | 45 km |
| 97702 | 6b | -5 to 0°F | 46 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00356883, at 44.3006, -120.8406, elevation 877 m (2,876 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 166.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Redmond Roberts Field (24 km)
- Grizzly (25 km)
- Bend 7 NE (36 km)
- Madras (37 km)
- Bend (45 km)
- Madras 2 N (47 km)
- Sisters (56 km)
- Pelton Dam (58 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.