Harman US

Grass Ranch Colony, SD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Grass Ranch Colony, a community in Brule County, South Dakota.

Tonight
59°F
Cloudy
Cloudy. Low around 59, with temperatures rising to around 62 overnight. North wind 5 to 10 mph.

7-day forecast for Grass Ranch Colony

WhenTempForecastWindPrecip
Tonight 59°F Cloudy 5 to 10 mph N 9%
Saturday 66°F Patchy Fog then Cloudy 10 mph N 11%
Saturday Night 55°F Cloudy 10 mph NE 9%
Sunday 62°F Rain Showers Likely 10 to 15 mph NE 56%
Sunday Night 52°F Rain Showers 10 mph ENE 89%
Monday 60°F Rain Showers 10 mph ENE 89%
Monday Night 48°F Mostly Cloudy 5 to 10 mph E 11%
Tuesday 65°F Mostly Cloudy 5 to 15 mph SE 11%
Tuesday Night 51°F Mostly Cloudy 10 to 15 mph SE 12%
Wednesday 69°F Chance Rain Showers 15 mph SSE 28%
Wednesday Night 54°F Chance Showers And Thunderstorms 10 to 15 mph SSE 40%
Thursday 71°F Chance Rain Showers then Partly Sunny 10 mph SSE 40%
Thursday Night 55°F Partly Cloudy 10 mph SE 10%
Friday 71°F Partly Sunny 10 to 15 mph SE 11%

Forecast source: National Weather Service (api.weather.gov) for Grass Ranch Colony (43.650, -98.884). Updated through the day.

Growing snapshot for Grass Ranch Colony

Last spring frost
May 3
First fall frost
Oct 5
Growing season
153 days
Hardiness zone
5a

More local growing data for Grass Ranch Colony: nearby ZIP 57355 weather · frost dates · planting calendar · South Dakota frost dates

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Climate data from the nearest NOAA station, White Lake, Sd (14.6 mi from Grass Ranch Colony). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.