Cass, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cass, a community in Sullivan County, Indiana.
This Afternoon
67°F
Mostly Cloudy
Mostly cloudy. High near 67, with temperatures falling to around 63 in the afternoon. West southwest wind around 12 mph, with gusts as high as 20 mph.
7-day forecast for Cass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Cloudy | 12 mph WSW | 8% |
| Tonight | 46°F | Mostly Cloudy | 2 to 8 mph WSW | 5% |
| Thursday | 63°F | Mostly Sunny | 3 to 10 mph SW | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 1 to 6 mph W | 6% |
| Friday | 56°F | Mostly Cloudy | 2 to 9 mph NNW | 3% |
| Friday Night | 33°F | Partly Cloudy | 2 to 7 mph NNW | 1% |
| Saturday | 55°F | Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 30°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Sunday | 59°F | Sunny | 0 to 6 mph NW | 0% |
| Sunday Night | 33°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Monday | 63°F | Sunny | 0 to 6 mph WSW | 0% |
| Monday Night | 37°F | Clear | 3 mph SW | 0% |
| Tuesday | 64°F | Sunny | 1 to 5 mph W | 0% |
| Tuesday Night | 38°F | Mostly Clear | 2 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Cass (39.088, -87.277). Updated through the day.
Growing snapshot for Cass
Last spring frost
Apr 14
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
6b
More local growing data for Cass: nearby ZIP 47848 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Carlisle
Dugger
Fairbanks
Farmersburg
Graysville
Hymera
Merom
New Lebanon
Paxton
Pleasantville
Shelburn
Sullivan
Climate data from the nearest NOAA station, Shakamak Sp, In (8.3 mi from Cass). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.