Frost dates for Squaw Butte-Northern Great Bas, OR
At Squaw Butte-Northern Great Bas, the median last spring frost (32°F) is Jun 11 and the median first fall frost is Sep 28, for a typical growing season of 107 days. For a 90% chance that the last frost has passed, wait until Jun 28. Nearby ZIP codes are in USDA hardiness zone 6a.
- Jun 11Last spring frost (median)50% chance of 32°F after this date
- Jun 28Safer planting date10% chance of 32°F after this date
- Sep 28First fall frost (median)50% chance of 32°F by this date
- 107 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 |
|---|---|---|---|
| 32°F | May 18 | Jun 11 | Jun 28 |
| 28°F | Apr 27 | May 24 | Jun 18 |
| 24°F | Apr 4 | Apr 28 | May 29 |
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 |
|---|---|---|---|
| 32°F | Sep 3 | Sep 28 | Oct 13 |
| 28°F | Sep 22 | Oct 13 | Oct 28 |
| 24°F | Oct 10 | Oct 27 | Nov 10 |
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 | 81 days | 107 days |
| 32°F | 78 days | 107 days | 135 days |
| 28°F | 106 days | 139 days | 171 days |
| 24°F | 149 days | 179 days | 208 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97758 | 6a | -10 to -5°F | 6 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 USC00358029, at 43.4869, -119.7211, elevation 1420 m (4,660 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 180.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Riley 10 WSW (3 km)
- O O Rch (40 km)
- Alkali Lake (62 km)
- Burns Muni Airport (63 km)
- Barnes Station (65 km)
- Malheur Refuge HQ (75 km)
- Paulina (75 km)
- Brothers (79 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.