Thorntown, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thorntown, a town in Boone County, Indiana.
Today
81°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 81. South southeast wind around 2 mph.
7-day forecast for Thorntown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Patchy Fog then Sunny | 2 mph SSE | 0% |
| Tonight | 60°F | Mostly Clear | 2 mph ESE | 0% |
| Wednesday | 83°F | Sunny | 3 mph SW | 0% |
| Wednesday Night | 65°F | Partly Cloudy then Isolated Showers And Thunderstorms | 0 to 3 mph SSW | 16% |
| Thursday | 81°F | Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 7 mph SSW | 65% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms | 1 to 6 mph SSW | 65% |
| Friday | 81°F | Scattered Showers And Thunderstorms | 5 mph SW | 32% |
| Friday Night | 65°F | Scattered Showers And Thunderstorms | 1 to 5 mph SSW | 32% |
| Saturday | 82°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 6 mph SSW | 18% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SSW | 18% |
| Sunday | 84°F | Mostly Sunny | 6 to 12 mph SW | 10% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph SSW | 19% |
| Monday | 85°F | Slight Chance Showers And Thunderstorms | 12 mph SW | 19% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph SW | 33% |
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 Aug 4, 2026.