Harrison, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Madison County, Montana.
This Afternoon
46°F
Mostly Sunny
Mostly sunny. High near 46, with temperatures falling to around 41 in the afternoon. Wind around 0 mph.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 28°F | Mostly Cloudy | 1 mph W | 0% |
| Wednesday | 44°F | Mostly Sunny | 0 mph | 0% |
| Wednesday Night | 27°F | Patchy Fog | 2 mph WSW | 0% |
| Thursday | 46°F | Patchy Fog then Mostly Sunny | 3 mph SW | 13% |
| Thursday Night | 27°F | Partly Cloudy | 3 mph SW | 13% |
| Friday | 47°F | Mostly Sunny | 6 mph SW | 5% |
| Friday Night | 28°F | Partly Cloudy | 6 to 14 mph SW | 5% |
| Saturday | 50°F | Mostly Sunny | 1 to 7 mph SW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 1 to 7 mph SSW | 0% |
| Sunday | 55°F | Mostly Sunny | 6 to 9 mph SSW | 2% |
| Sunday Night | 33°F | Mostly Cloudy | 1 to 7 mph SW | 2% |
| Monday | 52°F | Partly Sunny | 1 mph WNW | 2% |
| Monday Night | 34°F | Mostly Cloudy | 0 to 5 mph WSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Harrison (45.704, -111.784). Updated through the day.
Growing snapshot for Harrison
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
162 days
Hardiness zone
5a
More local growing data for Harrison: nearby ZIP 59735 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Alder
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Sheridan
Silver Star
Twin Bridges
Virginia City
Climate data from the nearest NOAA station, Norris Madison Pwr House, Mt (15.3 mi from Harrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.