Altona, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a town in Dekalb County, Indiana.
Today
84°F
Sunny
Sunny, with a high near 84. South wind 0 to 5 mph.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 0 to 5 mph S | 0% |
| Tonight | 59°F | Mostly Clear | 0 to 5 mph S | 0% |
| Wednesday | 86°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 0 to 5 mph SW | 45% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 71% |
| Thursday Night | 64°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 71% |
| Friday | 84°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 39% |
| Friday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 39% |
| Saturday | 86°F | Mostly Sunny | 0 to 10 mph SW | 12% |
| Saturday Night | 67°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SW | 15% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 16% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 15 mph SW | 38% |
| Monday | 87°F | Chance Rain Showers | 5 to 10 mph SW | 38% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 46% |
Forecast source: National Weather Service (api.weather.gov) for Altona (41.352, -85.153). Updated through the day.
Growing snapshot for Altona
Last spring frost
Apr 29
First fall frost
Oct 17
Growing season
171 days
Hardiness zone
6a
More local growing data for Altona: nearby ZIP 46738 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Garrett, In (1.9 mi from Altona). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.