Groton, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Groton, a city in Brown County, South Dakota.
Overnight
37°F
Light Rain Likely
Rain likely. Cloudy. Low around 37, with temperatures rising to around 41 overnight. North northwest wind around 18 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Groton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Light Rain Likely | 18 mph NNW | 66% |
| Wednesday | 44°F | Light Rain Likely | 16 mph NNW | 68% |
| Wednesday Night | 31°F | Mostly Cloudy then Patchy Fog | 14 mph NNW | 1% |
| Thursday | 40°F | Mostly Cloudy | 7 to 14 mph N | 0% |
| Thursday Night | 25°F | Mostly Cloudy | 0 to 6 mph E | 0% |
| Friday | 41°F | Mostly Sunny | 1 to 6 mph S | 0% |
| Friday Night | 26°F | Partly Cloudy | 7 mph S | 0% |
| Saturday | 53°F | Sunny | 7 to 10 mph SW | 1% |
| Saturday Night | 31°F | Mostly Clear | 3 to 7 mph WSW | 0% |
| Sunday | 54°F | Sunny | 3 to 9 mph SSW | 0% |
| Sunday Night | 35°F | Partly Cloudy | 8 mph SSW | 0% |
| Monday | 58°F | Mostly Sunny | 6 to 9 mph W | 0% |
| Monday Night | 32°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 54°F | Mostly Sunny | 2 to 6 mph WSW | 1% |
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.