Grantsburg, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsburg, a community in Crawford County, Indiana.
Tonight
70°F
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 10pm, then a slight chance of showers and thunderstorms between 10pm and midnight. Partly cloudy, with a low around 70. East wind around 2 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grantsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph E | 34% |
| Saturday | 92°F | Sunny then Slight Chance Showers And Thunderstorms | 3 mph S | 19% |
| Saturday Night | 70°F | Partly Cloudy | 2 mph S | 10% |
| Sunday | 92°F | Mostly Sunny | 3 mph SW | 8% |
| Sunday Night | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph N | 18% |
| Monday | 84°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph NE | 47% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 7 mph NE | 47% |
| Tuesday | 76°F | Chance Showers And Thunderstorms | 5 mph NE | 37% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph NE | 37% |
| Wednesday | 73°F | Partly Sunny | 3 mph N | 10% |
| Wednesday Night | 55°F | Partly Cloudy | 3 mph N | 8% |
| Thursday | 73°F | Mostly Sunny | 3 mph N | 6% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph N | 6% |
| Friday | 74°F | Mostly Sunny | 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Grantsburg (38.291, -86.471). Updated through the day.
Growing snapshot for Grantsburg
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
184 days
Hardiness zone
6b
More local growing data for Grantsburg: nearby ZIP 47123 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, English, In (0.5 mi from Grantsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.