Koontz Lake, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Koontz Lake, a community in Marshall County, Indiana.
Today
76°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 76. Southeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Koontz Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Showers And Thunderstorms | 5 to 10 mph SE | 91% |
| Tonight | 65°F | Showers And Thunderstorms | 5 mph S | 83% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 62% |
| Sunday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 46% |
| Monday | 67°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Monday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 18% |
| Tuesday | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday Night | 49°F | Slight Chance Rain Showers | 10 mph NE | 20% |
| Wednesday | 67°F | Slight Chance Rain Showers | 10 mph NE | 17% |
| Wednesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 10% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Friday | 72°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Friday Night | 49°F | Partly Cloudy | 5 mph NE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Koontz Lake (41.412, -86.478). Updated through the day.
Growing snapshot for Koontz Lake
Last spring frost
Apr 25
First fall frost
Oct 21
Growing season
178 days
Hardiness zone
6a
More local growing data for Koontz Lake: nearby ZIP 46513 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Argos
Bourbon
Bremen
Culver
Donaldson
La Paz
Lake of the Woods
Plymouth
Talma
Teegarden
Tippecanoe
Tyner
Climate data from the nearest NOAA station, Plymouth, In (6.1 mi from Koontz Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.