Frost dates for Beulah 1 W, ND
At Beulah 1 W, the median last spring frost (32°F) is May 21 and the median first fall frost is Sep 20, for a typical growing season of 121 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 21Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Sep 20First fall frost (median)50% chance of 32°F by this date
- 121 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 18 | May 31 | Jun 17 |
| 32°F | May 7 | May 21 | Jun 3 |
| 28°F | Apr 27 | May 11 | May 25 |
| 24°F | Apr 14 | Apr 30 | May 15 |
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 24 | Sep 10 | Sep 23 |
| 32°F | Sep 5 | Sep 20 | Oct 4 |
| 28°F | Sep 14 | Sep 28 | Oct 14 |
| 24°F | Sep 22 | Oct 8 | Oct 28 |
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 | 74 days | 100 days | 121 days |
| 32°F | 99 days | 121 days | 141 days |
| 28°F | 120 days | 142 days | 163 days |
| 24°F | 138 days | 161 days | 184 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 |
|---|---|---|---|
| 58523 | 4a | -30 to -25°F | 1 km |
| 58580 | 4a | -30 to -25°F | 12 km |
| 58545 | 4a | -30 to -25°F | 17 km |
| 58541 | 4a | -30 to -25°F | 21 km |
| 58625 | 4a | -30 to -25°F | 30 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 USC00320766, at 47.2622, -101.7906, elevation 544 m (1,785 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 191.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Riverdale (40 km)
- Hebron (44 km)
- New Salem 5nw (47 km)
- Center 4se (49 km)
- Garrison (50 km)
- Garrison (52 km)
- Underwood (53 km)
- Washburn (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.