Frost dates for Dupree 15 SSE, SD
At Dupree 15 SSE, the median last spring frost (32°F) is May 6 and the median first fall frost is Oct 2, for a typical growing season of 148 days. For a 90% chance that the last frost has passed, wait until May 20. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 6Last spring frost (median)50% chance of 32°F after this date
- May 20Safer planting date10% chance of 32°F after this date
- Oct 2First fall frost (median)50% chance of 32°F by this date
- 148 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 5 | May 17 | May 30 |
| 32°F | Apr 24 | May 6 | May 20 |
| 28°F | Apr 14 | Apr 27 | May 10 |
| 24°F | Apr 4 | Apr 16 | Apr 30 |
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 11 | Sep 25 | Oct 7 |
| 32°F | Sep 20 | Oct 2 | Oct 16 |
| 28°F | Sep 28 | Oct 11 | Oct 25 |
| 24°F | Oct 5 | Oct 20 | Nov 2 |
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 | 111 days | 131 days | 147 days |
| 32°F | 130 days | 148 days | 166 days |
| 28°F | 146 days | 166 days | 184 days |
| 24°F | 165 days | 183 days | 204 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 |
|---|---|---|---|
| 57636 | 4b | -25 to -20°F | 19 km |
| 57622 | 4b | -25 to -20°F | 22 km |
| 57623 | 4b | -25 to -20°F | 22 km |
| 57625 | 4b | -25 to -20°F | 37 km |
| 57537 | 4b | -25 to -20°F | 45 km |
| 57553 | 4b | -25 to -20°F | 46 km |
| 57748 | 4b | -25 to -20°F | 53 km |
| 57626 | 4b | -25 to -20°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 USC00392446, at 44.8658, -101.4672, elevation 640 m (2,100 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 170.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dupree (23 km)
- Kirley 6 N (30 km)
- Milesville 5 NE (41 km)
- Faith Muni Airport (47 km)
- Faith (48 km)
- Mission Ridge 5nw (54 km)
- Glad Valley 2 W (65 km)
- Timber Lake (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.