Whitehorse, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Whitehorse, a community in Dewey County, South Dakota.
Tonight
31°F
Mostly Cloudy
Mostly cloudy, with a low around 31. Northwest wind 9 to 15 mph.
7-day forecast for Whitehorse
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Mostly Cloudy | 9 to 15 mph NW | 0% |
| Wednesday | 51°F | Mostly Cloudy | 10 to 17 mph NW | 0% |
| Wednesday Night | 31°F | Mostly Cloudy then Patchy Fog | 7 to 13 mph NW | 0% |
| Thursday | 50°F | Patchy Fog then Mostly Sunny | 7 mph NNE | 0% |
| Thursday Night | 28°F | Partly Cloudy | 5 mph SE | 0% |
| Friday | 51°F | Mostly Sunny | 6 mph SSW | 0% |
| Friday Night | 31°F | Partly Cloudy | 6 mph SW | 3% |
| Saturday | 60°F | Sunny | 7 to 18 mph W | 3% |
| Saturday Night | 33°F | Mostly Clear | 5 to 8 mph W | 1% |
| Sunday | 62°F | Sunny | 5 to 10 mph SSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 9 mph WSW | 0% |
| Monday | 61°F | Sunny | 7 to 16 mph NW | 0% |
| Monday Night | 34°F | Partly Cloudy | 6 mph W | 1% |
| Tuesday | 58°F | Mostly Sunny | 3 to 9 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov) for Whitehorse (45.275, -100.901). Updated through the day.
Growing snapshot for Whitehorse
Last spring frost
May 10
First fall frost
Sep 30
Growing season
141 days
Hardiness zone
4b
More local growing data for Whitehorse: nearby ZIP 57661 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Timber Lake, Sd (12.2 mi from Whitehorse). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.