Hamilton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a city in Ravalli County, Montana.
This Afternoon
48°F
Sunny
Sunny. High near 48, with temperatures falling to around 43 in the afternoon. North northeast wind 0 to 3 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 48°F | Sunny | 0 to 3 mph NNE | 0% |
| Tonight | 25°F | Partly Cloudy | 1 to 5 mph ESE | 1% |
| Thursday | 46°F | Partly Sunny | 5 mph SSW | 4% |
| Thursday Night | 25°F | Mostly Clear | 5 mph SW | 0% |
| Friday | 50°F | Mostly Sunny | 7 mph SSW | 0% |
| Friday Night | 30°F | Mostly Cloudy | 5 to 9 mph SSW | 0% |
| Saturday | 57°F | Mostly Sunny | 5 mph S | 0% |
| Saturday Night | 34°F | Partly Cloudy | 3 to 13 mph S | 1% |
| Sunday | 59°F | Mostly Sunny | 5 to 10 mph WSW | 3% |
| Sunday Night | 32°F | Mostly Cloudy | 2 to 6 mph SW | 5% |
| Monday | 54°F | Partly Sunny | 2 mph W | 5% |
| Monday Night | 32°F | Mostly Cloudy | 2 to 6 mph SW | 4% |
| Tuesday | 56°F | Mostly Sunny then Slight Chance Light Rain | 6 mph SSW | 15% |
| Tuesday Night | 34°F | Slight Chance Light Rain then Partly Cloudy | 3 to 9 mph SSW | 15% |
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 Nov 5, 2026.