Frost dates for Timber Lake, SD
At Timber Lake, 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 141 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 10Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Sep 30First fall frost (median)50% chance of 32°F by this date
- 141 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 19 | Jun 2 |
| 32°F | Apr 29 | May 10 | May 23 |
| 28°F | Apr 15 | Apr 30 | May 12 |
| 24°F | Apr 4 | Apr 20 | May 4 |
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 10 | Sep 22 | Oct 4 |
| 32°F | Sep 17 | Sep 30 | Oct 13 |
| 28°F | Sep 22 | Oct 7 | Oct 20 |
| 24°F | Oct 2 | Oct 17 | Oct 30 |
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 | 108 days | 125 days | 141 days |
| 32°F | 123 days | 141 days | 161 days |
| 28°F | 138 days | 159 days | 178 days |
| 24°F | 159 days | 179 days | 198 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 |
|---|---|---|---|
| 57656 | 4b | -25 to -20°F | 2 km |
| 57661 | 4b | -25 to -20°F | 20 km |
| 57630 | 4b | -25 to -20°F | 21 km |
| 57657 | 4b | -25 to -20°F | 24 km |
| 57652 | 4b | -25 to -20°F | 45 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 USC00398307, at 45.4283, -101.0764, elevation 662 m (2,173 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 173.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mc Laughlin (48 km)
- Mc Intosh 6 SE (48 km)
- Mobridge 2nnw (51 km)
- Mobridge Muni Airport (54 km)
- Glad Valley 2 W (57 km)
- Dupree (59 km)
- Dupree 15 SSE (70 km)
- Mission Ridge 5nw (80 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.