Groton, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Groton, a city in Brown County, South Dakota.
Today
74°F
Sunny
Sunny, with a high near 74. Northwest wind around 9 mph.
7-day forecast for Groton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Sunny | 9 mph NW | 0% |
| Tonight | 52°F | Mostly Clear | 3 to 7 mph SSW | 0% |
| Wednesday | 81°F | Sunny | 6 to 9 mph SSW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 7 to 13 mph SSW | 2% |
| Thursday | 85°F | Sunny | 9 to 14 mph SSW | 6% |
| Thursday Night | 63°F | Mostly Clear | 10 mph S | 6% |
| Friday | 86°F | Sunny | 10 mph SW | 4% |
| Friday Night | 61°F | Mostly Clear | 5 to 8 mph E | 3% |
| Saturday | 85°F | Sunny | 6 to 13 mph E | 6% |
| Saturday Night | 62°F | Mostly Clear | 12 mph ENE | 13% |
| Sunday | 83°F | Mostly Sunny | 8 to 12 mph NE | 7% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 8 to 12 mph ENE | 26% |
| Monday | 81°F | Chance Showers And Thunderstorms then Partly Sunny | 8 to 13 mph ENE | 26% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms | 8 to 13 mph NE | 19% |
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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Prairiewood Village
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Warner
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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 Aug 4, 2026.