Frost dates for Ladner 9sw, SD
At Ladner 9sw, the median last spring frost (32°F) is May 13 and the median first fall frost is Sep 27, for a typical growing season of 135 days. For a 90% chance that the last frost has passed, wait until May 25. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 13Last spring frost (median)50% chance of 32°F after this date
- May 25Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 135 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 11 | May 23 | Jun 5 |
| 32°F | May 2 | May 13 | May 25 |
| 28°F | Apr 20 | May 4 | May 18 |
| 24°F | Apr 7 | Apr 24 | May 11 |
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 2 | Sep 18 | Oct 1 |
| 32°F | Sep 11 | Sep 27 | Oct 10 |
| 28°F | Sep 20 | Oct 4 | Oct 20 |
| 24°F | Sep 27 | Oct 15 | Oct 29 |
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 | 95 days | 116 days | 135 days |
| 32°F | 114 days | 135 days | 154 days |
| 28°F | 131 days | 153 days | 173 days |
| 24°F | 149 days | 171 days | 194 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 57724 | 4b | -25 to -20°F | 24 km |
| 57720 | 4b | -25 to -20°F | 35 km |
| 57755 | 4b | -25 to -20°F | 43 km |
| 59319 | 4b | -25 to -20°F | 46 km |
| 58643 | 4a | -30 to -25°F | 50 km |
| 59324 | 4b | -25 to -20°F | 54 km |
| 58651 | 4b | -25 to -20°F | 55 km |
| 58623 | 4b | -25 to -20°F | 56 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 USC00394671, at 45.7733, -103.8789, elevation 914 m (3,000 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 192.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Camp Crook (26 km)
- Buffalo Asos (32 km)
- Ludlow 3 SSE (39 km)
- Antelope Ranger Station (50 km)
- Buffalo 13 ESE (53 km)
- Redig 11 NE (59 km)
- Ralph 1 N (63 km)
- Lodgepole 5sw (84 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.