Spearfish, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Spearfish, a city in Lawrence County, South Dakota.
Tonight
56°F
Showers And Thunderstorms
Showers and thunderstorms before 2am, then patchy fog and a chance of showers and thunderstorms between 2am and 3am, then patchy fog and a slight chance of showers and thunderstorms. Cloudy, with a low around 56. Southeast wind around 3 mph. Chance of precipitation is 80%.
7-day forecast for Spearfish
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms | 3 mph SE | 76% |
| Saturday | 64°F | Patchy Fog | 1 to 10 mph E | 74% |
| Saturday Night | 53°F | Showers And Thunderstorms Likely | 6 to 12 mph E | 74% |
| Sunday | 59°F | Rain Showers | 6 to 10 mph E | 99% |
| Sunday Night | 50°F | Showers And Thunderstorms | 2 to 12 mph E | 84% |
| Monday | 63°F | Chance Rain Showers | 2 to 14 mph E | 49% |
| Monday Night | 49°F | Partly Cloudy | 5 to 15 mph SE | 9% |
| Tuesday | 74°F | Sunny | 1 to 10 mph E | 8% |
| Tuesday Night | 55°F | Mostly Clear | 2 to 12 mph SE | 8% |
| Wednesday | 76°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph SE | 25% |
| Wednesday Night | 55°F | Mostly Clear | 2 to 6 mph S | 12% |
| Thursday | 78°F | Sunny | 1 to 9 mph NE | 6% |
| Thursday Night | 56°F | Partly Cloudy | 5 to 9 mph S | 5% |
| Friday | 80°F | Mostly Sunny | 3 to 10 mph SE | 11% |
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 Sep 19, 2026.