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
36°F
Slight Chance Light Rain
A slight chance of rain after 3am. Cloudy. Low around 36, with temperatures rising to around 41 overnight. North northwest wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grassland Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 36°F | Slight Chance Light Rain | 17 mph NNW | 17% |
| Wednesday | 46°F | Slight Chance Light Rain then Cloudy | 15 to 18 mph NNW | 23% |
| Wednesday Night | 31°F | Mostly Cloudy | 12 to 15 mph N | 0% |
| Thursday | 41°F | Partly Sunny | 7 to 14 mph NNE | 0% |
| Thursday Night | 23°F | Mostly Cloudy | 1 to 6 mph ESE | 0% |
| Friday | 42°F | Mostly Sunny | 2 to 8 mph S | 0% |
| Friday Night | 26°F | Partly Cloudy | 6 mph SSW | 0% |
| Saturday | 55°F | Sunny | 6 to 13 mph WSW | 0% |
| Saturday Night | 32°F | Mostly Clear | 6 to 9 mph W | 0% |
| Sunday | 55°F | Sunny | 6 to 10 mph SW | 0% |
| Sunday Night | 35°F | Partly Cloudy | 8 mph SW | 0% |
| Monday | 59°F | Mostly Sunny | 8 to 14 mph WNW | 0% |
| Monday Night | 32°F | Mostly Clear | 7 mph NW | 0% |
| Tuesday | 54°F | Mostly Sunny | 7 mph WSW | 1% |
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 Nov 4, 2026.