Grassland Colony, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grassland Colony, a community in Brown County, South Dakota.
This Afternoon
64°F
Areas Of Drizzle
Areas of drizzle and patchy fog. Cloudy, with a high near 64. East wind around 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
7-day forecast for Grassland Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Areas Of Drizzle | 17 mph E | 44% |
| Tonight | 54°F | Areas Of Fog | 8 to 13 mph NE | 21% |
| Saturday | 67°F | Areas Of Fog | 13 mph NE | 3% |
| Saturday Night | 52°F | Cloudy | 12 mph NE | 12% |
| Sunday | 65°F | Cloudy then Chance Rain Showers | 14 mph NE | 28% |
| Sunday Night | 49°F | Chance Rain Showers | 6 to 10 mph ENE | 39% |
| Monday | 65°F | Chance Rain Showers then Mostly Cloudy | 9 mph E | 39% |
| Monday Night | 46°F | Mostly Cloudy | 7 mph ESE | 2% |
| Tuesday | 67°F | Partly Sunny | 5 to 14 mph SE | 3% |
| Tuesday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph SSE | 15% |
| Wednesday | 69°F | Slight Chance Rain Showers | 13 to 17 mph SSE | 18% |
| Wednesday Night | 52°F | Chance Rain Showers | 8 to 13 mph SSE | 29% |
| Thursday | 72°F | Chance Rain Showers then Partly Sunny | 9 mph SSE | 29% |
| Thursday Night | 53°F | Partly Cloudy | 8 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Grassland Colony (45.668, -98.796). Updated through the day.
Growing snapshot for Grassland Colony
Last spring frost
May 9
First fall frost
Sep 28
Growing season
141 days
Hardiness zone
4b
More local growing data for Grassland Colony: nearby ZIP 57481 weather · frost dates · planting calendar · South Dakota frost dates
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Climate data from the nearest NOAA station, Leola, Sd (13.2 mi from Grassland Colony). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.