Thorntown, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thorntown, a town in Boone County, Indiana.
Tonight
64°F
Scattered Rain Showers
Scattered rain showers. Partly cloudy. Low around 64, with temperatures rising to around 67 overnight. East wind around 9 mph. Chance of precipitation is 20%.
7-day forecast for Thorntown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 64°F | Scattered Rain Showers | 9 mph E | 21% |
| Saturday | 84°F | Scattered Showers And Thunderstorms | 9 mph S | 63% |
| Saturday Night | 68°F | Scattered Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 mph S | 42% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 3 to 8 mph WNW | 51% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 65% |
| Monday | 70°F | Showers And Thunderstorms Likely | 12 to 15 mph ENE | 65% |
| Monday Night | 53°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 47% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 14 mph NE | 32% |
| Tuesday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 14 mph NNE | 16% |
| Wednesday | 69°F | Mostly Cloudy | 7 to 10 mph NNE | 5% |
| Wednesday Night | 53°F | Mostly Cloudy | 5 to 10 mph N | 3% |
| Thursday | 71°F | Partly Sunny | 5 to 9 mph N | 4% |
| Thursday Night | 54°F | Mostly Cloudy | 3 to 9 mph NNE | 4% |
| Friday | 72°F | Mostly Sunny | 3 to 9 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Thorntown (40.129, -86.610). Updated through the day.
Growing snapshot for Thorntown
Last spring frost
Apr 27
First fall frost
Oct 12
Growing season
167 days
Hardiness zone
6a
More local growing data for Thorntown: nearby ZIP 46071 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Crawfordsville 6 Se, In (12.6 mi from Thorntown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.