Koontz Lake, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Koontz Lake, a community in Marshall County, Indiana.
This Afternoon
67°F
Partly Sunny
Partly sunny. High near 67, with temperatures falling to around 59 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Koontz Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Partly Sunny | 15 mph SW | 13% |
| Tonight | 47°F | Mostly Cloudy | 10 mph SW | 13% |
| Thursday | 56°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph SW | 35% |
| Thursday Night | 41°F | Rain Showers Likely | 5 to 10 mph NW | 66% |
| Friday | 50°F | Rain Showers Likely | 10 to 15 mph NW | 55% |
| Friday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 20% |
| Saturday | 51°F | Partly Sunny | 5 to 10 mph NW | 4% |
| Saturday Night | 30°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 32°F | Mostly Clear | 5 mph W | 0% |
| Monday | 59°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 60°F | Sunny | 5 mph W | 0% |
| Tuesday Night | 35°F | Partly Cloudy | 0 to 5 mph NW | 2% |
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 Nov 4, 2026.