Karns, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Karns, a community in Knox County, Tennessee.
Tonight
70°F
Isolated Showers And Thunderstorms then Partly Cloudy
Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 70. Heat index values as high as 95. Northeast wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Karns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Isolated Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph NE | 19% |
| Saturday | 93°F | Sunny then Chance Showers And Thunderstorms | 0 to 5 mph N | 31% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 31% |
| Sunday | 91°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 21% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 mph | 31% |
| Monday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 mph | 45% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 0 mph | 51% |
| Tuesday | 85°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 73% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely | 0 to 5 mph NE | 73% |
| Wednesday | 82°F | Rain Showers Likely | 0 to 5 mph NW | 63% |
| Wednesday Night | 62°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 63% |
| Thursday | 78°F | Chance Rain Showers | 0 to 5 mph N | 30% |
| Thursday Night | 60°F | Chance Rain Showers then Partly Cloudy | 5 mph N | 30% |
| Friday | 78°F | Mostly Sunny | 5 mph NE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Karns (35.978, -84.109). Updated through the day.
Growing snapshot for Karns
Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7b
More local growing data for Karns: nearby ZIP 37931 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Oak Ridge Asos, Tn (7 mi from Karns). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.