Knox, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knox, a city in Starke County, Indiana.
This Afternoon
67°F
Partly Sunny
Partly sunny. High near 67, with temperatures falling to around 59 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Knox
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Partly Sunny | 10 to 15 mph SW | 10% |
| Tonight | 47°F | Mostly Cloudy | 10 mph SW | 13% |
| Thursday | 56°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph SW | 32% |
| Thursday Night | 40°F | Rain Showers Likely | 5 to 10 mph NW | 70% |
| Friday | 50°F | Chance Rain Showers | 10 to 15 mph NW | 47% |
| Friday Night | 34°F | Mostly Cloudy | 5 to 10 mph NW | 12% |
| Saturday | 51°F | Mostly Sunny | 5 to 10 mph NW | 3% |
| Saturday Night | 30°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 32°F | Mostly Clear | 5 mph W | 0% |
| Monday | 60°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 61°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 Knox (41.291, -86.621). Updated through the day.
Growing snapshot for Knox
Last spring frost
Apr 26
First fall frost
Oct 19
Growing season
174 days
Hardiness zone
5b
More local growing data for Knox: nearby ZIP 46534 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Knox Wwtp, In (1.5 mi from Knox). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.