Harrison, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Madison County, Montana.
Overnight
45°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 45. Wind around 0 mph.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Patchy Smoke | 0 mph | 0% |
| Tuesday | 76°F | Patchy Smoke | 0 to 6 mph NE | 0% |
| Tuesday Night | 49°F | Patchy Smoke | 1 to 6 mph WNW | 1% |
| Wednesday | 84°F | Sunny then Patchy Smoke | 0 to 7 mph NW | 0% |
| Wednesday Night | 52°F | Patchy Smoke then Mostly Clear | 1 to 8 mph WSW | 0% |
| Thursday | 93°F | Sunny | 0 to 8 mph WNW | 0% |
| Thursday Night | 57°F | Mostly Clear | 1 to 10 mph WSW | 0% |
| Friday | 97°F | Sunny | 0 to 17 mph W | 0% |
| Friday Night | 58°F | Mostly Clear | 3 to 15 mph W | 0% |
| Saturday | 94°F | Sunny | 0 to 7 mph WNW | 1% |
| Saturday Night | 58°F | Mostly Clear | 0 to 9 mph NW | 1% |
| Sunday | 91°F | Sunny | 0 to 6 mph NNE | 2% |
| Sunday Night | 57°F | Partly Cloudy | 0 to 10 mph NNW | 5% |
| Monday | 89°F | Sunny | 0 to 6 mph NNE | 1% |
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
Big Sky
Brandon
Ennis
Jeffers
Mammoth
McAllister
Norris
Pony
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 Aug 4, 2026.