Summit, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a town in Grant County, South Dakota.
Tonight
55°F
Areas Of Drizzle
Areas of drizzle and areas of fog before 5am, then areas of fog and patchy drizzle. Cloudy. Low around 55, with temperatures rising to around 58 overnight. East northeast wind around 12 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Areas Of Drizzle | 12 mph ENE | 46% |
| Saturday | 61°F | Areas Of Fog | 13 mph NE | 16% |
| Saturday Night | 53°F | Mostly Cloudy | 12 mph NE | 12% |
| Sunday | 62°F | Mostly Cloudy | 14 mph ENE | 11% |
| Sunday Night | 50°F | Chance Rain Showers | 7 to 10 mph ENE | 35% |
| Monday | 59°F | Chance Rain Showers | 9 mph E | 35% |
| Monday Night | 46°F | Mostly Cloudy | 8 mph ESE | 4% |
| Tuesday | 62°F | Partly Sunny | 7 to 12 mph SE | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 10 mph SE | 5% |
| Wednesday | 65°F | Partly Sunny | 10 to 14 mph SSE | 10% |
| Wednesday Night | 52°F | Chance Rain Showers | 10 mph SSE | 27% |
| Thursday | 68°F | Chance Rain Showers then Partly Sunny | 9 mph S | 27% |
| Thursday Night | 54°F | Partly Cloudy | 8 mph SSE | 11% |
| Friday | 69°F | Partly Sunny | 9 to 13 mph SSE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Summit (45.306, -97.039). Updated through the day.
Growing snapshot for Summit
Last spring frost
May 14
First fall frost
Sep 28
Growing season
136 days
Hardiness zone
4a
More local growing data for Summit: nearby ZIP 57266 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Summit 1 W, Sd (1.8 mi from Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.