Karns, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Karns, a community in Knox County, Tennessee.
Tonight
61°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 61. East wind around 0 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 | 61°F | Mostly Cloudy then Slight Chance Rain Showers | 0 mph | 17% |
| Wednesday | 71°F | Showers And Thunderstorms | 0 to 5 mph S | 94% |
| Wednesday Night | 61°F | Showers And Thunderstorms | 0 to 5 mph SW | 85% |
| Thursday | 73°F | Slight Chance Rain Showers | 0 to 5 mph W | 15% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NW | 7% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph NW | 6% |
| Friday Night | 46°F | Partly Cloudy | 0 to 5 mph N | 4% |
| Saturday | 64°F | Mostly Sunny | 0 to 5 mph N | 1% |
| Saturday Night | 39°F | Partly Cloudy | 5 mph N | 1% |
| Sunday | 63°F | Mostly Sunny | 0 to 5 mph NW | 7% |
| Sunday Night | 37°F | Partly Cloudy | 5 mph NW | 9% |
| Monday | 63°F | Mostly Sunny | 0 to 5 mph W | 9% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph W | 5% |
| Tuesday | 66°F | Mostly Sunny | 0 to 5 mph SW | 1% |
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 Nov 4, 2026.