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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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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Bath Corner
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Hutterville Colony
Mansfield
Mina
Prairiewood Village
Stratford
Warner
Westport
Wetonka
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.