Montana City, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Montana City, a community in Lewis And Clark County, Montana.
Overnight
28°F
Partly Cloudy
Partly cloudy, with a low around 28. Wind around 0 mph.
7-day forecast for Montana City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Partly Cloudy | 0 mph | 0% |
| Wednesday | 48°F | Mostly Sunny | 2 mph NNW | 0% |
| Wednesday Night | 28°F | Mostly Clear | 1 to 5 mph SSW | 0% |
| Thursday | 47°F | Partly Sunny | 3 mph W | 3% |
| Thursday Night | 29°F | Partly Cloudy | 3 to 7 mph SW | 3% |
| Friday | 50°F | Mostly Sunny | 5 to 8 mph SW | 0% |
| Friday Night | 35°F | Partly Cloudy | 5 to 13 mph SSW | 0% |
| Saturday | 56°F | Mostly Sunny | 3 to 7 mph SSE | 0% |
| Saturday Night | 36°F | Partly Cloudy | 3 to 9 mph S | 0% |
| Sunday | 60°F | Mostly Sunny | 6 to 9 mph SSW | 3% |
| Sunday Night | 34°F | Partly Cloudy | 2 to 8 mph WSW | 3% |
| Monday | 53°F | Mostly Sunny | 5 mph SSE | 1% |
| Monday Night | 35°F | Mostly Cloudy | 6 mph S | 1% |
| Tuesday | 57°F | Mostly Sunny | 7 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Montana City (46.524, -111.933). Updated through the day.
Growing snapshot for Montana City
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
5a
More local growing data for Montana City: nearby ZIP 59635 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Helena Rgnl Ap, Mt (7.9 mi from Montana City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.