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
43°F
Mostly Clear
Mostly clear, with a low around 43. Wind around 0 mph.
7-day forecast for Montana City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 77°F | Patchy Smoke | 0 to 6 mph NNE | 0% |
| Tuesday Night | 47°F | Mostly Clear | 5 mph SW | 1% |
| Wednesday | 85°F | Sunny | 2 to 6 mph NW | 0% |
| Wednesday Night | 50°F | Mostly Clear | 6 mph W | 0% |
| Thursday | 93°F | Sunny | 1 to 9 mph W | 0% |
| Thursday Night | 54°F | Mostly Clear | 3 to 8 mph W | 0% |
| Friday | 97°F | Sunny | 1 to 16 mph WSW | 0% |
| Friday Night | 55°F | Mostly Clear | 6 to 13 mph WSW | 0% |
| Saturday | 94°F | Sunny | 1 to 10 mph WNW | 0% |
| Saturday Night | 55°F | Mostly Clear | 3 to 8 mph W | 0% |
| Sunday | 91°F | Sunny | 1 to 8 mph NW | 1% |
| Sunday Night | 54°F | Mostly Clear | 3 to 8 mph WNW | 1% |
| Monday | 88°F | Sunny | 1 to 7 mph NNW | 1% |
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 Aug 4, 2026.