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.

Overnight
60°F
Areas Of Fog
Areas of fog. Cloudy, with a low around 60. North wind around 5 mph.

7-day forecast for Grass Ranch Colony

WhenTempForecastWindPrecip
Overnight 60°F Areas Of Fog 5 mph N 9%
Saturday 67°F Patchy Fog then Cloudy 10 mph N 12%
Saturday Night 54°F Cloudy then Slight Chance Rain Showers 10 mph NE 17%
Sunday 63°F Chance Rain Showers 10 to 15 mph NE 54%
Sunday Night 50°F Rain Showers 10 mph ENE 84%
Monday 61°F Rain Showers 10 mph E 84%
Monday Night 46°F Mostly Cloudy 5 to 10 mph ESE 8%
Tuesday 65°F Partly Sunny 5 to 15 mph SE 8%
Tuesday Night 49°F Mostly Cloudy 10 to 15 mph SE 11%
Wednesday 68°F Partly Sunny then Slight Chance Rain Showers 15 to 20 mph SSE 18%
Wednesday Night 52°F Chance Showers And Thunderstorms 15 mph SSE 44%
Thursday 71°F Chance Showers And Thunderstorms 15 mph SSE 44%
Thursday Night 54°F Slight Chance Rain Showers 10 to 15 mph SE 16%
Friday 73°F Slight Chance Rain Showers then Partly Sunny 10 to 15 mph SE 16%

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.