Hamilton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Ravalli County, Montana.
Today
80°F
Areas Of Smoke
Areas of smoke. Sunny, with a high near 80. North northeast wind 2 to 8 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Areas Of Smoke | 2 to 8 mph NNE | 0% |
| Tonight | 47°F | Patchy Smoke | 2 to 9 mph W | 1% |
| Wednesday | 86°F | Patchy Smoke | 5 mph SSW | 0% |
| Wednesday Night | 49°F | Patchy Smoke then Mostly Clear | 6 mph WSW | 0% |
| Thursday | 93°F | Sunny | 2 to 6 mph SSW | 0% |
| Thursday Night | 54°F | Mostly Clear | 3 to 7 mph WSW | 0% |
| Friday | 96°F | Sunny | 3 to 10 mph SW | 0% |
| Friday Night | 54°F | Mostly Clear | 6 to 13 mph WSW | 0% |
| Saturday | 93°F | Sunny | 3 to 9 mph SW | 0% |
| Saturday Night | 54°F | Mostly Clear | 3 to 10 mph W | 0% |
| Sunday | 90°F | Sunny | 2 to 6 mph SSW | 0% |
| Sunday Night | 52°F | Mostly Clear | 2 to 9 mph WNW | 0% |
| Monday | 90°F | Sunny | 2 to 6 mph N | 0% |
| Monday Night | 52°F | Mostly Clear | 2 to 8 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Hamilton (46.252, -114.160). Updated through the day.
Growing snapshot for Hamilton
Last spring frost
May 21
First fall frost
Sep 22
Growing season
122 days
Hardiness zone
5b
More local growing data for Hamilton: nearby ZIP 59840 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hamilton, Mt (6.3 mi from Hamilton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.