Frost dates for Bridgewater, SD
At Bridgewater, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 7, for a typical growing season of 161 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zone 5a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 7First fall frost (median)50% chance of 32°F by this date
- 161 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 | Apr 26 | May 7 | May 22 |
| 32°F | Apr 15 | Apr 30 | May 11 |
| 28°F | Apr 6 | Apr 19 | May 2 |
| 24°F | Mar 28 | Apr 10 | Apr 23 |
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 17 | Sep 30 | Oct 11 |
| 32°F | Sep 25 | Oct 7 | Oct 21 |
| 28°F | Oct 3 | Oct 19 | Oct 31 |
| 24°F | Oct 15 | Oct 28 | Nov 10 |
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 | 126 days | 143 days | 162 days |
| 32°F | 144 days | 161 days | 178 days |
| 28°F | 160 days | 181 days | 200 days |
| 24°F | 181 days | 198 days | 217 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 |
|---|---|---|---|
| 57319 | 5a | -20 to -15°F | 3 km |
| 57332 | 5a | -20 to -15°F | 12 km |
| 57043 | 5a | -20 to -15°F | 21 km |
| 57047 | 5a | -20 to -15°F | 23 km |
| 57053 | 5a | -20 to -15°F | 33 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 USC00391032, at 43.5525, -97.5017, elevation 432 m (1,417 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 165.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Alexandria (26 km)
- Salem 5ne (26 km)
- Menno (36 km)
- Montrose 8n (38 km)
- Mitchell 2 N (47 km)
- Winfred 2s (48 km)
- Mitchell Muni Airport (49 km)
- Howard (51 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.