Mountain Plains, SD Weather & Growing Conditions
Today
48°F
Partly Sunny
Partly sunny. High near 48, with temperatures falling to around 41 in the afternoon. Northwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 48°F | Partly Sunny | 5 mph NW | 0% |
| Tonight | 31°F | Partly Cloudy | 3 mph W | 0% |
| Thursday | 54°F | Sunny | 5 mph SE | 0% |
| Thursday Night | 36°F | Partly Cloudy | 7 mph SW | 0% |
| Friday | 50°F | Mostly Sunny | 1 to 5 mph W | 1% |
| Friday Night | 36°F | Mostly Clear | 2 to 9 mph SW | 0% |
| Saturday | 54°F | Sunny | 5 to 12 mph W | 0% |
| Saturday Night | 38°F | Mostly Clear | 5 to 9 mph SW | 0% |
| Sunday | 65°F | Sunny | 6 to 9 mph SW | 0% |
| Sunday Night | 44°F | Mostly Clear | 2 to 9 mph SW | 0% |
| Monday | 58°F | Sunny | 3 mph NW | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 mph SW | 1% |
| Tuesday | 60°F | Mostly Sunny | 5 mph SW | 0% |
| Tuesday Night | 42°F | Partly Cloudy | 5 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mountain Plains, SD
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
Explore more for Mountain Plains, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Spearfish, Sd (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.