Spearfish, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Spearfish, a city in Lawrence County, South Dakota.
This Afternoon
54°F
Sunny
Sunny. High near 54, with temperatures falling to around 42 in the afternoon. Northwest wind around 7 mph, with gusts as high as 17 mph.
7-day forecast for Spearfish
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Sunny | 7 mph NW | 0% |
| 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% |
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.