Knox, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knox, a city in Starke County, Indiana.
Overnight
58°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. Low around 58, with temperatures rising to around 63 overnight. East wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Knox
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Slight Chance Showers And Thunderstorms | 10 mph E | 20% |
| Saturday | 77°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph SE | 88% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely | 5 mph S | 80% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 60% |
| Sunday Night | 53°F | Chance Rain Showers | 10 mph NE | 46% |
| Monday | 66°F | Chance Rain Showers | 10 mph NE | 42% |
| Monday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NE | 20% |
| 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 then Mostly Cloudy | 10 mph NE | 16% |
| Wednesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Thursday Night | 50°F | Mostly Cloudy | 5 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 5 to 10 mph NE | 1% |
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 Sep 19, 2026.