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Monarch, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Monarch, a community in Cascade County, Montana.

Tonight
48°F
Chance Showers And Thunderstorms then Light Rain Likely
A chance of showers and thunderstorms before midnight, then rain likely. Cloudy, with a low around 48. South wind around 2 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for Monarch

WhenTempForecastWindPrecip
Tonight 48°F Chance Showers And Thunderstorms then Light Rain Likely 2 mph S 73%
Saturday 56°F Light Rain Likely 1 to 6 mph NE 73%
Saturday Night 45°F Chance Light Rain 0 to 5 mph SE 35%
Sunday 66°F Patchy Fog then Mostly Sunny 0 to 3 mph WSW 10%
Sunday Night 44°F Mostly Clear 5 mph SSE 0%
Monday 72°F Sunny 6 mph SW 0%
Monday Night 48°F Mostly Clear 3 to 7 mph SW 0%
Tuesday 72°F Mostly Sunny 6 mph SW 1%
Tuesday Night 48°F Mostly Clear 6 mph S 1%
Wednesday 73°F Sunny 8 mph SW 2%
Wednesday Night 48°F Mostly Clear 6 mph SSW 2%
Thursday 75°F Sunny 6 mph SSW 2%
Thursday Night 51°F Mostly Clear 5 to 10 mph S 2%
Friday 75°F Mostly Sunny 8 mph SSW 2%

Forecast source: National Weather Service (api.weather.gov) for Monarch (47.100, -110.845). Updated through the day.

Growing snapshot for Monarch

Last spring frost
Jun 6
First fall frost
Sep 12
Growing season
99 days
Hardiness zone
4b

More local growing data for Monarch: nearby ZIP 59463 weather · frost dates · planting calendar · Montana frost dates

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Climate data from the nearest NOAA station, Neihart 8 Nnw, Mt (4.3 mi from Monarch). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.