Groton, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Groton, a city in Brown County, South Dakota.
Tonight
37°F
Light Rain Likely
Rain likely. Cloudy, with a low around 37. North northwest wind 13 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Groton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 37°F | Light Rain Likely | 13 to 18 mph NNW | 64% |
| Wednesday | 44°F | Light Rain Likely | 14 to 17 mph NNW | 72% |
| Wednesday Night | 30°F | Mostly Cloudy | 10 to 14 mph N | 11% |
| Thursday | 41°F | Partly Sunny | 8 to 14 mph N | 1% |
| Thursday Night | 25°F | Mostly Cloudy | 1 to 7 mph ENE | 0% |
| Friday | 43°F | Partly Sunny | 1 to 6 mph S | 0% |
| Friday Night | 27°F | Partly Cloudy | 6 mph SSW | 0% |
| Saturday | 55°F | Mostly Sunny | 6 to 10 mph WSW | 2% |
| Saturday Night | 31°F | Partly Cloudy | 7 mph W | 2% |
| Sunday | 55°F | Sunny | 5 to 9 mph SSW | 1% |
| Sunday Night | 35°F | Partly Cloudy | 8 mph SSW | 0% |
| Monday | 57°F | Mostly Sunny | 7 to 13 mph W | 0% |
| Monday Night | 33°F | Mostly Clear | 3 to 7 mph W | 0% |
| Tuesday | 54°F | Mostly Sunny | 3 to 7 mph SW | 0% |
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
Nearby towns & communities
Aberdeen
Bath
Bath Corner
Claremont
Columbia
Ferney
Frederick
Grassland Colony
Hecla
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 Nov 4, 2026.