Frost dates for Bredette, MT
At Bredette, the median last spring frost (32°F) is May 20 and the median first fall frost is Sep 21, for a typical growing season of 122 days. For a 90% chance that the last frost has passed, wait until Jun 1. Nearby ZIP codes are in USDA hardiness zones 3b to 4a.
- May 20Last spring frost (median)50% chance of 32°F after this date
- Jun 1Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 122 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 19 | May 31 | Jun 17 |
| 32°F | May 8 | May 20 | Jun 1 |
| 28°F | Apr 26 | May 10 | May 23 |
| 24°F | Apr 15 | Apr 30 | May 13 |
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 27 | Sep 11 | Sep 22 |
| 32°F | Sep 6 | Sep 21 | Oct 1 |
| 28°F | Sep 14 | Sep 28 | Oct 11 |
| 24°F | Sep 22 | Oct 6 | Oct 21 |
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 | 78 days | 101 days | 120 days |
| 32°F | 105 days | 122 days | 139 days |
| 28°F | 122 days | 140 days | 158 days |
| 24°F | 136 days | 159 days | 181 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 |
|---|---|---|---|
| 59222 | 4a | -30 to -25°F | 23 km |
| 59255 | 4a | -30 to -25°F | 33 km |
| 59263 | 3b | -35 to -30°F | 34 km |
| 59257 | 3b | -35 to -30°F | 37 km |
| 59213 | 4a | -30 to -25°F | 47 km |
| 59253 | 3b | -35 to -30°F | 48 km |
| 59258 | 3b | -35 to -30°F | 48 km |
| 59201 | 4a | -30 to -25°F | 48 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 USC00241088, at 48.5156, -105.2992, elevation 705 m (2,313 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 187.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wolf Point 34 NE (7 km)
- Wolf Point 29 ENE (27 km)
- Scobey 4 NW (38 km)
- Redstone (43 km)
- Wolf Point Intl Airport (51 km)
- Wolf Point (53 km)
- Plentywood (61 km)
- Medicine Lake 3 SE (63 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.