Spearfish, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Spearfish, a city in Lawrence County, South Dakota.
Today
73°F
Areas Of Smoke then Sunny
Areas of smoke before noon. Sunny, with a high near 73. Northwest wind 2 to 7 mph, with gusts as high as 18 mph.
7-day forecast for Spearfish
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Areas Of Smoke then Sunny | 2 to 7 mph NW | 1% |
| Tonight | 52°F | Partly Cloudy then Slight Chance Rain Showers | 6 mph S | 17% |
| Wednesday | 81°F | Sunny | 1 to 6 mph NE | 5% |
| Wednesday Night | 57°F | Mostly Clear | 6 mph S | 1% |
| Thursday | 89°F | Sunny | 1 to 9 mph NW | 1% |
| Thursday Night | 62°F | Mostly Clear | 5 to 8 mph SW | 0% |
| Friday | 93°F | Sunny | 2 to 10 mph N | 1% |
| Friday Night | 67°F | Mostly Clear | 7 to 12 mph S | 0% |
| Saturday | 94°F | Sunny | 3 to 13 mph NW | 2% |
| Saturday Night | 65°F | Mostly Clear | 3 to 13 mph SE | 4% |
| Sunday | 94°F | Mostly Sunny | 5 to 15 mph SE | 11% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 to 15 mph SE | 16% |
| Monday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 16 mph E | 18% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 5 to 16 mph SE | 37% |
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 Aug 4, 2026.