Frost dates for Wolf Point Intl Airport, MT
At Wolf Point Intl Airport, the median last spring frost (32°F) is May 16 and the median first fall frost is Sep 20, for a typical growing season of 125 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 16Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Sep 20First fall frost (median)50% chance of 32°F by this date
- 125 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 15 | May 27 | Jun 7 |
| 32°F | May 5 | May 16 | May 29 |
| 28°F | Apr 24 | May 6 | May 18 |
| 24°F | Apr 11 | Apr 27 | May 9 |
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 30 | Sep 12 | Sep 22 |
| 32°F | Sep 7 | Sep 20 | Oct 1 |
| 28°F | Sep 15 | Sep 29 | Oct 12 |
| 24°F | Sep 23 | Oct 8 | Oct 23 |
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 | 89 days | 107 days | 124 days |
| 32°F | 108 days | 125 days | 142 days |
| 28°F | 127 days | 145 days | 163 days |
| 24°F | 144 days | 165 days | 185 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 |
|---|---|---|---|
| 59201 | 4a | -30 to -25°F | 7 km |
| 59274 | 4a | -30 to -25°F | 30 km |
| 59255 | 4a | -30 to -25°F | 35 km |
| 59225 | 4a | -30 to -25°F | 35 km |
| 59223 | 4a | -30 to -25°F | 51 km |
| 59213 | 4a | -30 to -25°F | 52 km |
| 59248 | 4a | -30 to -25°F | 53 km |
| 59259 | 4a | -30 to -25°F | 58 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 USW00094017, at 48.0944, -105.5744, elevation 605 m (1,986 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 198.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wolf Point (6 km)
- Vida 6 NE (28 km)
- Wolf Point 29 ENE (42 km)
- Bredette (51 km)
- Wolf Point 34 NE (51 km)
- Nashua #2 (58 km)
- Fort Peck Power Plant (63 km)
- Circle (76 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.