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Groton, SD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Groton, a city in Brown County, South Dakota.

Overnight
57°F
Patchy Fog
Patchy fog and a slight chance of drizzle after 2am. Cloudy, with a low around 57. Northeast wind around 6 mph.

7-day forecast for Groton

WhenTempForecastWindPrecip
Overnight 57°F Patchy Fog 6 mph NE 10%
Saturday 67°F Patchy Fog then Cloudy 7 to 12 mph NNE 3%
Saturday Night 51°F Mostly Cloudy 5 to 10 mph NE 5%
Sunday 67°F Mostly Cloudy 12 mph NE 7%
Sunday Night 48°F Mostly Cloudy 5 to 9 mph E 9%
Monday 67°F Partly Sunny 8 mph E 9%
Monday Night 44°F Partly Cloudy 6 mph ESE 7%
Tuesday 69°F Mostly Sunny 5 to 13 mph SSE 1%
Tuesday Night 50°F Partly Cloudy 10 mph SSE 12%
Wednesday 69°F Partly Sunny 10 to 16 mph SSE 14%
Wednesday Night 53°F Chance Rain Showers 8 to 12 mph SSE 27%
Thursday 72°F Chance Rain Showers then Partly Sunny 9 mph SSE 27%
Thursday Night 54°F Partly Cloudy 7 mph SSE 13%
Friday 73°F Partly Sunny 7 to 14 mph SE 13%

Forecast source: National Weather Service (api.weather.gov) for Groton (45.452, -98.100). Updated through the day.

Growing snapshot for Groton

Last spring frost
May 6
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
4a

More local growing data for Groton: nearby ZIP 57445 weather · frost dates · planting calendar · South Dakota frost dates

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Climate data from the nearest NOAA station, Andover #2, Sd (10.7 mi from Groton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.