Altona, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a town in Dekalb County, Indiana.
This Afternoon
67°F
Scattered Rain Showers
Scattered rain showers. Mostly cloudy, with a high near 67. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Scattered Rain Showers | 15 mph SW | 50% |
| Tonight | 48°F | Mostly Cloudy | 5 to 10 mph SW | 10% |
| Thursday | 57°F | Mostly Cloudy | 10 to 15 mph SW | 13% |
| Thursday Night | 42°F | Rain Showers Likely | 5 to 10 mph W | 58% |
| Friday | 50°F | Chance Rain Showers | 5 to 15 mph NW | 32% |
| Friday Night | 34°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 32% |
| Saturday | 51°F | Partly Sunny | 5 to 10 mph NW | 2% |
| Saturday Night | 30°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 54°F | Sunny | 5 to 15 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 5 to 10 mph W | 1% |
| Monday | 58°F | Sunny | 5 to 10 mph W | 1% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Tuesday | 60°F | Sunny | 5 to 10 mph W | 0% |
| Tuesday Night | 36°F | Mostly Clear | 0 to 5 mph NW | 2% |
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 Nov 4, 2026.