Frost dates for Belle Fourche, SD
At Belle Fourche, the median last spring frost (32°F) is May 10 and the median first fall frost is Sep 30, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until May 25. Nearby ZIP codes are in USDA hardiness zones 4b to 5b.
- May 10Last spring frost (median)50% chance of 32°F after this date
- May 25Safer planting date10% chance of 32°F after this date
- Sep 30First fall frost (median)50% chance of 32°F by this date
- 143 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 8 | May 21 | Jun 4 |
| 32°F | Apr 27 | May 10 | May 25 |
| 28°F | Apr 14 | Apr 30 | May 15 |
| 24°F | Apr 2 | Apr 17 | May 6 |
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 8 | Sep 21 | Oct 4 |
| 32°F | Sep 16 | Sep 30 | Oct 13 |
| 28°F | Sep 23 | Oct 10 | Oct 24 |
| 24°F | Oct 1 | Oct 20 | Nov 3 |
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 | 122 days | 143 days |
| 32°F | 120 days | 143 days | 161 days |
| 28°F | 141 days | 163 days | 184 days |
| 24°F | 161 days | 184 days | 205 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 |
|---|---|---|---|
| 57779 | 5b | -15 to -10°F | 13 km |
| 57762 | 4b | -25 to -20°F | 20 km |
| 57783 | 5b | -15 to -10°F | 25 km |
| 82712 | 5a | -20 to -15°F | 27 km |
| 57793 | 5a | -20 to -15°F | 27 km |
| 57717 | 4b | -25 to -20°F | 29 km |
| 82710 | 5a | -20 to -15°F | 36 km |
| 57732 | 5a | -20 to -15°F | 40 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 USC00390559, at 44.6714, -103.8511, elevation 920 m (3,020 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 167.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spearfish (19 km)
- Bear Ridge (24 km)
- Newell (34 km)
- Deadwood (34 km)
- Belle Fourche 22 NNW (36 km)
- Lead (36 km)
- Fort Meade (41 km)
- Rochford 2 WNW (61 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.