Frost dates for Larimore 4sw, ND
At Larimore 4sw, the median last spring frost (32°F) is May 11 and the median first fall frost is Sep 28, for a typical growing season of 139 days. For a 90% chance that the last frost has passed, wait until May 25. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 11Last spring frost (median)50% chance of 32°F after this date
- May 25Safer planting date10% chance of 32°F after this date
- Sep 28First fall frost (median)50% chance of 32°F by this date
- 139 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 7 | May 21 | Jun 4 |
| 32°F | Apr 28 | May 11 | May 25 |
| 28°F | Apr 19 | May 2 | May 18 |
| 24°F | Apr 10 | Apr 23 | May 8 |
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 | Sep 5 | Sep 19 | Sep 29 |
| 32°F | Sep 16 | Sep 28 | Oct 11 |
| 28°F | Sep 26 | Oct 8 | Oct 21 |
| 24°F | Oct 3 | Oct 17 | Oct 31 |
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 | 101 days | 120 days | 137 days |
| 32°F | 122 days | 139 days | 156 days |
| 28°F | 138 days | 157 days | 176 days |
| 24°F | 157 days | 177 days | 196 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 |
|---|---|---|---|
| 58251 | 4a | -30 to -25°F | 9 km |
| 58267 | 4a | -30 to -25°F | 15 km |
| 58214 | 4a | -30 to -25°F | 17 km |
| 58244 | 4a | -30 to -25°F | 27 km |
| 58212 | 4a | -30 to -25°F | 29 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 USC00325013, at 47.8742, -97.7106, elevation 351 m (1,152 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 192.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Petersburg 2 N (29 km)
- Grand Forks Intl Airport (40 km)
- Grand Forks Univ (nws) (46 km)
- Mayville (50 km)
- Cooperstown (58 km)
- Grafton (64 km)
- Hillsboro 3 N (68 km)
- Colgate (70 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.