Frost dates for Fort Pierre 17 WSW, SD
At Fort Pierre 17 WSW, the median last spring frost (32°F) is May 10 and the median first fall frost is Sep 27, for a typical growing season of 138 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 5a.
- 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 27First fall frost (median)50% chance of 32°F by this date
- 138 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 1 |
| 32°F | Apr 29 | May 10 | May 25 |
| 28°F | Apr 17 | May 1 | May 15 |
| 24°F | Apr 8 | Apr 22 | 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 7 | Sep 19 | Oct 1 |
| 32°F | Sep 13 | Sep 27 | Oct 10 |
| 28°F | Sep 20 | Oct 5 | Oct 20 |
| 24°F | Sep 28 | Oct 15 | Oct 29 |
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 | 103 days | 121 days | 141 days |
| 32°F | 118 days | 138 days | 157 days |
| 28°F | 135 days | 156 days | 176 days |
| 24°F | 153 days | 175 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% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 57532 | 4b | -25 to -20°F | 15 km |
| 57531 | 5a | -20 to -15°F | 33 km |
| 57559 | 5a | -20 to -15°F | 35 km |
| 57501 | 4b | -25 to -20°F | 42 km |
| 57552 | 4b | -25 to -20°F | 44 km |
| 57562 | 5a | -20 to -15°F | 45 km |
| 57576 | 5a | -20 to -15°F | 48 km |
| 57537 | 4b | -25 to -20°F | 49 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 USC00393076, at 44.2444, -100.6592, elevation 485 m (1,590 ft).
- Data quality: Representative (10+ years), 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
- Oahe Dam (29 km)
- Pierre Regional Airport (33 km)
- Pierre 24 S (35 km)
- Murdo (40 km)
- Midland (44 km)
- Presho 7 NW (49 km)
- Mission Ridge 5nw (56 km)
- Kirley 6 N (68 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.