Thorntown, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thorntown, a town in Boone County, Indiana.
This Afternoon
68°F
Mostly Cloudy
Mostly cloudy. High near 68, with temperatures falling to around 62 in the afternoon. West southwest wind 13 to 16 mph, with gusts as high as 22 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Thorntown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Mostly Cloudy | 13 to 16 mph WSW | 14% |
| Tonight | 46°F | Mostly Cloudy | 7 to 12 mph WSW | 6% |
| Thursday | 60°F | Mostly Cloudy | 9 to 16 mph WSW | 3% |
| Thursday Night | 41°F | Chance Light Rain | 3 to 9 mph W | 39% |
| Friday | 52°F | Slight Chance Light Rain | 8 to 13 mph NNW | 16% |
| Friday Night | 32°F | Partly Cloudy | 5 to 10 mph NNW | 10% |
| Saturday | 52°F | Mostly Sunny | 3 to 8 mph NW | 0% |
| Saturday Night | 28°F | Mostly Clear | 1 to 5 mph WNW | 0% |
| Sunday | 57°F | Sunny | 2 to 10 mph W | 0% |
| Sunday Night | 31°F | Mostly Clear | 2 to 7 mph W | 0% |
| Monday | 61°F | Sunny | 1 to 8 mph WSW | 0% |
| Monday Night | 35°F | Clear | 7 mph SW | 0% |
| Tuesday | 63°F | Sunny | 7 mph W | 1% |
| Tuesday Night | 35°F | Mostly Clear | 1 to 5 mph NW | 1% |
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 Nov 5, 2026.