Frost dates for Sioux Falls WFO Airport, SD
At Sioux Falls WFO Airport, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 13, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zone 5a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 13First fall frost (median)50% chance of 32°F by this date
- 169 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 23 | May 6 | May 19 |
| 32°F | Apr 10 | Apr 26 | May 9 |
| 28°F | Apr 2 | Apr 15 | Apr 30 |
| 24°F | Mar 22 | Apr 6 | Apr 21 |
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 20 | Oct 2 | Oct 16 |
| 32°F | Sep 28 | Oct 13 | Oct 28 |
| 28°F | Oct 11 | Oct 24 | Nov 6 |
| 24°F | Oct 21 | Nov 2 | Nov 16 |
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 | 130 days | 149 days | 169 days |
| 32°F | 149 days | 169 days | 190 days |
| 28°F | 169 days | 191 days | 210 days |
| 24°F | 190 days | 209 days | 229 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 |
|---|---|---|---|
| 57117 | 5a | -20 to -15°F | 7 km |
| 57107 | 5a | -20 to -15°F | 7 km |
| 57105 | 5a | -20 to -15°F | 8 km |
| 57055 | 5a | -20 to -15°F | 9 km |
| 57106 | 5a | -20 to -15°F | 12 km |
| 57020 | 5a | -20 to -15°F | 13 km |
| 57064 | 5a | -20 to -15°F | 19 km |
| 57033 | 5a | -20 to -15°F | 19 km |
| 57041 | 5a | -20 to -15°F | 19 km |
| 57015 | 5a | -20 to -15°F | 27 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 USC00397666, at 43.5878, -96.7300, elevation 436 m (1,430 ft).
- Data quality: Estimated from nearby stations (2+ years), 7 years of freeze data.
- Average days per year at or below 32°F: 154.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sioux Falls (0 km)
- Sioux Falls 14 NNE (18 km)
- Canton (33 km)
- Montrose 8n (46 km)
- Salem 5ne (50 km)
- Wentworth 2.5 WNW (52 km)
- Flandreau (53 km)
- Madison 2se (53 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.