Frost dates for Deadwood, SD
At Deadwood, the median last spring frost (32°F) is May 24 and the median first fall frost is Sep 25, for a typical growing season of 125 days. For a 90% chance that the last frost has passed, wait until Jun 6. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 24Last spring frost (median)50% chance of 32°F after this date
- Jun 6Safer planting date10% chance of 32°F after this date
- Sep 25First fall frost (median)50% chance of 32°F by this date
- 125 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 16 |
| 32°F | May 7 | May 24 | Jun 6 |
| 28°F | Apr 27 | May 14 | Jun 2 |
| 24°F | Apr 11 | Apr 30 | May 20 |
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 1 | Sep 16 | Sep 29 |
| 32°F | Sep 9 | Sep 25 | Oct 9 |
| 28°F | Sep 16 | Oct 3 | Oct 18 |
| 24°F | Sep 26 | Oct 14 | 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 | 84 days | 107 days | 126 days |
| 32°F | 104 days | 125 days | 146 days |
| 28°F | 117 days | 143 days | 167 days |
| 24°F | 139 days | 165 days | 191 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 |
|---|---|---|---|
| 57732 | 5a | -20 to -15°F | 6 km |
| 57783 | 5b | -15 to -10°F | 18 km |
| 57754 | 5a | -20 to -15°F | 18 km |
| 57793 | 5a | -20 to -15°F | 21 km |
| 57759 | 5a | -20 to -15°F | 21 km |
| 57779 | 5b | -15 to -10°F | 22 km |
| 82712 | 5a | -20 to -15°F | 35 km |
| 57718 | 5a | -20 to -15°F | 37 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 USC00392207, at 44.3736, -103.7314, elevation 1423 m (4,670 ft).
- Data quality: Representative (10+ years), 15 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
- Lead (2 km)
- Spearfish (18 km)
- Fort Meade (21 km)
- Rochford 2 WNW (27 km)
- Bear Ridge (28 km)
- Belle Fourche (34 km)
- Pactola Dam (40 km)
- Johnson Siding (40 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.