Knoxville, AR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knoxville, a town in Johnson County, Arkansas.
Today
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 102. East southeast wind around 5 mph.
7-day forecast for Knoxville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 5 mph ESE | 0% |
| Tonight | 73°F | Mostly Clear | 5 mph E | 0% |
| Wednesday | 100°F | Sunny | 0 to 5 mph ESE | 3% |
| Wednesday Night | 75°F | Partly Cloudy | 0 to 5 mph SE | 4% |
| Thursday | 100°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 15% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 27% |
| Friday | 96°F | Chance Showers And Thunderstorms | 0 to 5 mph ESE | 44% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 0 to 5 mph ESE | 44% |
| Saturday | 96°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SE | 23% |
| Saturday Night | 74°F | Mostly Clear | 0 to 5 mph SE | 9% |
| Sunday | 98°F | Sunny | 0 to 5 mph SSE | 7% |
| Sunday Night | 74°F | Mostly Clear | 0 to 5 mph SE | 7% |
| Monday | 98°F | Mostly Sunny | 0 to 5 mph SSE | 9% |
| Monday Night | 75°F | Mostly Clear | 0 to 5 mph SE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Knoxville (35.378, -93.362). Updated through the day.
Growing snapshot for Knoxville
Last spring frost
Mar 24
First fall frost
Nov 10
Growing season
233 days
Hardiness zone
8a
More local growing data for Knoxville: nearby ZIP 72845 weather · frost dates · planting calendar · Arkansas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Clarksville 2N, Ar (10.9 mi from Knoxville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.