Altona, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a town in Dekalb County, Indiana.
Tonight
57°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 57. East wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph E | 15% |
| Saturday | 75°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph SE | 90% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms | 5 mph S | 82% |
| Sunday | 73°F | Showers And Thunderstorms | 5 to 10 mph N | 79% |
| Sunday Night | 53°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 54% |
| Monday | 65°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 51% |
| Monday Night | 50°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 38% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 19% |
| Tuesday Night | 52°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Wednesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 17% |
| Thursday | 67°F | Mostly Cloudy | 5 to 10 mph N | 8% |
| Thursday Night | 52°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Friday | 69°F | Mostly Sunny | 5 to 10 mph N | 6% |
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 Sep 19, 2026.