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.
Overnight
48°F
Partly Cloudy
Partly cloudy, with a low around 48. West northwest wind around 8 mph.
7-day forecast for Grassland Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Partly Cloudy | 8 mph WNW | 0% |
| Tuesday | 75°F | Patchy Smoke then Mostly Sunny | 7 to 13 mph WNW | 0% |
| Tuesday Night | 52°F | Mostly Clear | 5 to 9 mph WSW | 0% |
| Wednesday | 82°F | Sunny | 5 to 10 mph WSW | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 7 to 10 mph SSW | 1% |
| Thursday | 87°F | Sunny | 10 mph SW | 2% |
| Thursday Night | 59°F | Mostly Clear | 9 mph S | 4% |
| Friday | 87°F | Sunny | 7 to 12 mph WSW | 4% |
| Friday Night | 60°F | Mostly Clear | 6 to 10 mph E | 2% |
| Saturday | 86°F | Mostly Sunny | 6 to 13 mph E | 3% |
| Saturday Night | 60°F | Mostly Clear | 13 mph NE | 9% |
| Sunday | 83°F | Mostly Sunny | 9 to 14 mph NE | 5% |
| Sunday Night | 61°F | Slight Chance Showers And Thunderstorms | 10 to 14 mph ENE | 26% |
| Monday | 82°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph ENE | 26% |
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 Aug 4, 2026.