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.
This Afternoon
70°F
Patchy Fog
Patchy fog before 2pm. Cloudy. High near 70, with temperatures falling to around 67 in the afternoon. East northeast wind around 9 mph.
7-day forecast for Green Grass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Patchy Fog | 9 mph ENE | 1% |
| Tonight | 55°F | Patchy Fog | 5 to 9 mph NE | 6% |
| Saturday | 68°F | Patchy Fog then Slight Chance Rain Showers | 6 to 12 mph ENE | 18% |
| Saturday Night | 52°F | Rain Showers | 12 mph ENE | 77% |
| Sunday | 62°F | Rain Showers | 15 mph E | 82% |
| Sunday Night | 50°F | Rain Showers | 7 to 12 mph E | 84% |
| Monday | 64°F | Chance Rain Showers | 7 to 12 mph E | 29% |
| Monday Night | 48°F | Mostly Cloudy | 12 mph SE | 10% |
| Tuesday | 70°F | Partly Sunny | 13 to 22 mph SE | 7% |
| Tuesday Night | 52°F | Mostly Cloudy | 18 to 22 mph SE | 12% |
| Wednesday | 76°F | Partly Sunny then Slight Chance Rain Showers | 16 to 20 mph SE | 17% |
| Wednesday Night | 54°F | Chance Rain Showers then Partly Cloudy | 6 to 15 mph SE | 32% |
| Thursday | 77°F | Mostly Sunny | 6 to 9 mph SE | 5% |
| Thursday Night | 55°F | Partly Cloudy | 9 mph ESE | 9% |
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 Sep 18, 2026.