Frost dates for Mellette 4 W, SD
At Mellette 4 W, the median last spring frost (32°F) is May 11 and the median first fall frost is Sep 27, for a typical growing season of 137 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 11Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 137 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 20 | May 31 |
| 32°F | Apr 29 | May 11 | May 23 |
| 28°F | Apr 18 | May 2 | May 15 |
| 24°F | Apr 10 | Apr 23 | 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 5 | Sep 17 | Sep 29 |
| 32°F | Sep 15 | Sep 27 | Oct 7 |
| 28°F | Sep 21 | Oct 4 | Oct 17 |
| 24°F | Sep 29 | Oct 14 | Oct 26 |
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 | 121 days | 138 days |
| 32°F | 120 days | 137 days | 156 days |
| 28°F | 136 days | 154 days | 173 days |
| 24°F | 154 days | 172 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% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 57465 | 4a | -30 to -25°F | 7 km |
| 57461 | 4a | -30 to -25°F | 11 km |
| 57460 | 4b | -25 to -20°F | 15 km |
| 57424 | 4b | -25 to -20°F | 16 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 USC00395456, at 45.1550, -98.5825, elevation 395 m (1,296 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 182.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Redfield (32 km)
- Aberdeen 3 E (36 km)
- Aberdeen (36 km)
- Conde (38 km)
- Turton (40 km)
- Faulkton 1 NW (45 km)
- Ipswich (48 km)
- Andover #2 (60 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.