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.
Today
62°F
Showers And Thunderstorms
Showers and thunderstorms before 9am, then rain between 9am and noon, then showers and thunderstorms. Cloudy, with a high near 62. North northwest wind around 6 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Montana City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Showers And Thunderstorms | 6 mph NNW | 95% |
| Tonight | 45°F | Slight Chance Light Rain then Mostly Cloudy | 3 mph SSW | 19% |
| Sunday | 71°F | Mostly Sunny | 1 to 5 mph E | 0% |
| Sunday Night | 45°F | Mostly Clear | 5 mph SSE | 0% |
| Monday | 76°F | Sunny | 2 to 8 mph SE | 0% |
| Monday Night | 46°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 77°F | Sunny | 1 to 6 mph SE | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 2 mph S | 1% |
| Wednesday | 78°F | Sunny | 2 to 7 mph SE | 2% |
| Wednesday Night | 48°F | Mostly Clear | 6 mph SSE | 3% |
| Thursday | 79°F | Sunny | 3 to 8 mph SSE | 2% |
| Thursday Night | 48°F | Mostly Clear | 6 mph S | 4% |
| Friday | 78°F | Mostly Sunny | 5 to 8 mph S | 4% |
| Friday Night | 46°F | Mostly Cloudy | 8 mph W | 14% |
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 Sep 19, 2026.