Karns, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Karns, a community in Knox County, Tennessee.
Overnight
69°F
Mostly Clear
Mostly clear, with a low around 69. Northeast wind around 5 mph.
7-day forecast for Karns
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Mostly Clear | 5 mph NE | 1% |
| Tuesday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph N | 35% |
| Tuesday Night | 70°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 mph | 36% |
| Wednesday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 53% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 51% |
| Thursday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 50% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 50% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 37% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 37% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 48% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 mph | 48% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 mph | 36% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 36% |
| Monday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 39% |
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 Aug 4, 2026.