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
76°F
Patchy Smoke then Sunny
Patchy smoke before 8am. Sunny, with a high near 76. West northwest wind 5 to 12 mph.
7-day forecast for Green Grass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Patchy Smoke then Sunny | 5 to 12 mph WNW | 0% |
| Tonight | 53°F | Mostly Clear | 3 to 8 mph SW | 1% |
| Wednesday | 84°F | Mostly Sunny | 2 to 9 mph WSW | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 5 to 8 mph S | 2% |
| Thursday | 92°F | Sunny | 6 to 9 mph W | 0% |
| Thursday Night | 61°F | Mostly Clear | 8 mph ENE | 0% |
| Friday | 94°F | Sunny | 6 to 12 mph NNE | 1% |
| Friday Night | 63°F | Mostly Clear | 12 mph ESE | 0% |
| Saturday | 96°F | Sunny | 10 to 15 mph NE | 0% |
| Saturday Night | 62°F | Mostly Clear | 9 to 14 mph ENE | 4% |
| Sunday | 92°F | Mostly Sunny | 9 to 18 mph E | 7% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 12 to 16 mph E | 32% |
| Monday | 89°F | Mostly Sunny | 13 to 17 mph ENE | 12% |
| Monday Night | 62°F | Chance Showers And Thunderstorms | 12 to 17 mph ENE | 35% |
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 Aug 4, 2026.