Harrison, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Hamilton County, Tennessee.
Today
96°F
Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Sunny. High near 96, with temperatures falling to around 93 in the afternoon. Heat index values as high as 102. North wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 96°F | Sunny then Chance Showers And Thunderstorms | 0 to 5 mph N | 25% |
| Tonight | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 32% |
| Sunday | 94°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 29% |
| Sunday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 28% |
| Monday | 94°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 mph | 40% |
| Monday Night | 70°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 mph | 63% |
| Tuesday | 89°F | Showers And Thunderstorms | 0 to 5 mph SW | 82% |
| Tuesday Night | 68°F | Showers And Thunderstorms | 0 mph | 82% |
| Wednesday | 82°F | Rain Showers Likely | 0 to 5 mph S | 66% |
| Wednesday Night | 64°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 66% |
| Thursday | 82°F | Slight Chance Rain Showers | 0 to 5 mph N | 18% |
| Thursday Night | 62°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph N | 18% |
| Friday | 81°F | Mostly Sunny then Slight Chance Rain Showers | 0 to 5 mph N | 15% |
| Friday Night | 60°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph N | 15% |
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
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Mowbray Mountain
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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 Sep 19, 2026.