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
82°F
Sunny
Sunny, with a high near 82. South wind around 5 mph.
7-day forecast for Koontz Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 5 mph S | 0% |
| Tonight | 61°F | Mostly Clear | 0 to 5 mph S | 0% |
| Wednesday | 83°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 27% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph S | 80% |
| Thursday | 79°F | Showers And Thunderstorms Likely | 5 mph SW | 80% |
| Thursday Night | 62°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 65% |
| Friday | 81°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 16% |
| Friday Night | 63°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 16% |
| Saturday | 83°F | Mostly Sunny | 5 mph SW | 12% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 19% |
| Sunday | 85°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph SW | 19% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 45% |
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
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Bremen
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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 Aug 4, 2026.