Mountain Plains, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mountain Plains, a community in Lawrence County, South Dakota.
Tonight
56°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely between 10pm and 3am, then patchy fog and showers and thunderstorms likely. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. South wind 0 to 5 mph. Chance of precipitation is 70%.
7-day forecast for Mountain Plains
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 67% |
| Saturday | 65°F | Patchy Fog | 0 to 8 mph E | 74% |
| Saturday Night | 53°F | Showers And Thunderstorms Likely | 3 to 9 mph E | 74% |
| Sunday | 60°F | Rain Showers | 3 to 8 mph E | 99% |
| Sunday Night | 50°F | Showers And Thunderstorms | 1 to 9 mph E | 83% |
| Monday | 64°F | Rain Showers Likely | 1 to 10 mph E | 55% |
| Monday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 3 to 12 mph SE | 15% |
| Tuesday | 75°F | Sunny | 1 to 7 mph E | 9% |
| Tuesday Night | 56°F | Mostly Clear | 2 to 9 mph SE | 8% |
| Wednesday | 77°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 6 mph E | 27% |
| Wednesday Night | 56°F | Mostly Clear | 5 mph S | 12% |
| Thursday | 79°F | Sunny | 1 to 7 mph NE | 7% |
| Thursday Night | 58°F | Partly Cloudy | 5 to 8 mph SE | 5% |
| Friday | 81°F | Mostly Sunny | 3 to 8 mph SE | 12% |
Forecast source: National Weather Service (api.weather.gov) for Mountain Plains (44.467, -103.864). Updated through the day.
Growing snapshot for Mountain Plains
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
More local growing data for Mountain Plains: 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
North Spearfish
Spearfish
St. Onge
Whitewood
Climate data from the nearest NOAA station, Spearfish, Sd (0.1 mi from Mountain Plains). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.