Spearfish, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Spearfish, a city in Lawrence County, South Dakota.
Tonight
30°F
Mostly Clear
Mostly clear, with a low around 30. West wind around 7 mph.
7-day forecast for Spearfish
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Mostly Clear | 7 mph W | 0% |
| Wednesday | 50°F | Partly Sunny | 7 mph W | 0% |
| Wednesday Night | 31°F | Mostly Cloudy | 7 mph SW | 0% |
| Thursday | 55°F | Sunny | 3 to 7 mph SE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 3 to 7 mph SW | 0% |
| Friday | 52°F | Mostly Sunny | 2 to 8 mph W | 1% |
| Friday Night | 37°F | Mostly Clear | 5 to 10 mph SW | 6% |
| Saturday | 57°F | Sunny | 9 to 20 mph W | 5% |
| Saturday Night | 38°F | Mostly Clear | 7 to 10 mph SW | 1% |
| Sunday | 65°F | Sunny | 6 to 10 mph SW | 0% |
| Sunday Night | 44°F | Mostly Clear | 8 to 13 mph SW | 0% |
| Monday | 58°F | Sunny | 5 to 8 mph NW | 0% |
| Monday Night | 40°F | Partly Cloudy | 6 mph SW | 1% |
| Tuesday | 61°F | Mostly Sunny | 3 to 9 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov) for Spearfish (44.492, -103.820). Updated through the day.
Growing snapshot for Spearfish
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
More local growing data for Spearfish: nearby ZIP 57799 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Belle Fourche
Boulder Canyon
Central City
Crook City
Deadwood
Lead
Mountain Plains
North Spearfish
St. Onge
Whitewood
Climate data from the nearest NOAA station, Spearfish, Sd (0.1 mi from Spearfish). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.