Harrison, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Hamilton County, Tennessee.
Today
88°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 88. Northeast wind around 0 mph. Chance of precipitation is 40%.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Chance Showers And Thunderstorms | 0 mph | 39% |
| Tonight | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 39% |
| Wednesday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph S | 54% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 49% |
| Thursday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 44% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph S | 44% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph S | 35% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 35% |
| Saturday | 89°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 60% |
| Saturday Night | 73°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 60% |
| Sunday | 89°F | Chance Showers And Thunderstorms | 0 mph | 43% |
| Sunday Night | 73°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 43% |
| Monday | 90°F | Chance Showers And Thunderstorms | 0 mph | 41% |
| Monday Night | 74°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 41% |
Forecast source: National Weather Service (api.weather.gov) for Harrison (35.125, -85.147). Updated through the day.
Growing snapshot for Harrison
Last spring frost
Mar 24
First fall frost
Nov 9
Growing season
230 days
Hardiness zone
8a
More local growing data for Harrison: nearby ZIP 37416 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Apison
Chattanooga
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Lookout Mountain
Middle Valley
Mowbray Mountain
Ooltewah
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Ridgeside
Sale Creek
Soddy-Daisy
Walden
Climate data from the nearest NOAA station, Chattanooga Lovell Ap, Tn (5.3 mi from Harrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.