Green Grass, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Green Grass, a community in Dewey County, South Dakota.
Today
47°F
Partly Sunny
Partly sunny. High near 47, with temperatures falling to around 40 in the afternoon. North northwest wind 9 to 23 mph, with gusts as high as 31 mph.
7-day forecast for Green Grass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 47°F | Partly Sunny | 9 to 23 mph NNW | 1% |
| Tonight | 30°F | Mostly Cloudy | 8 to 12 mph NW | 0% |
| Wednesday | 51°F | Mostly Cloudy | 12 to 17 mph NW | 0% |
| Wednesday Night | 30°F | Mostly Cloudy | 8 to 13 mph NNW | 0% |
| Thursday | 50°F | Mostly Sunny | 3 to 7 mph NNE | 0% |
| Thursday Night | 27°F | Partly Cloudy | 5 mph SE | 0% |
| Friday | 51°F | Mostly Sunny | 6 mph SW | 0% |
| Friday Night | 30°F | Partly Cloudy | 3 to 7 mph WSW | 2% |
| Saturday | 59°F | Sunny | 8 to 20 mph WNW | 2% |
| Saturday Night | 32°F | Mostly Clear | 5 to 8 mph W | 0% |
| Sunday | 60°F | Sunny | 5 to 10 mph SSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 6 to 10 mph WSW | 0% |
| Monday | 60°F | Sunny | 5 to 16 mph NW | 0% |
| Monday Night | 34°F | Partly Cloudy | 3 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Green Grass (45.157, -101.287). Updated through the day.
Growing snapshot for Green Grass
Last spring frost
May 8
First fall frost
Oct 1
Growing season
144 days
Hardiness zone
4b
More local growing data for Green Grass: nearby ZIP 57636 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dupree, Sd (8.1 mi from Green Grass). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.