Frost dates for Tyndall, SD
At Tyndall, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 7, for a typical growing season of 158 days. For a 90% chance that the last frost has passed, wait until May 14. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 14Safer planting date10% chance of 32°F after this date
- Oct 7First fall frost (median)50% chance of 32°F by this date
- 158 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 29 | May 10 | May 22 |
| 32°F | Apr 18 | May 1 | May 14 |
| 28°F | Apr 7 | Apr 21 | May 4 |
| 24°F | Mar 30 | Apr 10 | Apr 26 |
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 12 |
| 32°F | Sep 24 | Oct 7 | Oct 20 |
| 28°F | Oct 1 | Oct 17 | Oct 29 |
| 24°F | Oct 13 | Oct 26 | Nov 9 |
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 | 123 days | 140 days | 157 days |
| 32°F | 139 days | 158 days | 176 days |
| 28°F | 157 days | 177 days | 196 days |
| 24°F | 177 days | 197 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 |
|---|---|---|---|
| 57066 | 5a | -20 to -15°F | 0 km |
| 57315 | 5a | -20 to -15°F | 14 km |
| 57063 | 5a | -20 to -15°F | 17 km |
| 57059 | 5a | -20 to -15°F | 17 km |
| 57354 | 5a | -20 to -15°F | 23 km |
| 57376 | 5a | -20 to -15°F | 26 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 USC00398472, at 42.9917, -97.8703, elevation 433 m (1,420 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 157.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wagner (36 km)
- Menno (36 km)
- Yankton 2 E (43 km)
- Armour (53 km)
- Pickstown (55 km)
- Pickstown 4ssw (56 km)
- Bridgewater (69 km)
- Alexandria (74 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.