Harman US

Monarch, MT Weather & Growing Conditions

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

Overnight
48°F
Light Rain Likely
Rain likely. Cloudy, with a low around 48. Wind around 0 mph. Chance of precipitation is 60%.

7-day forecast for Monarch

WhenTempForecastWindPrecip
Overnight 48°F Light Rain Likely 0 mph 55%
Saturday 59°F Light Rain Likely 0 to 5 mph ENE 58%
Saturday Night 42°F Slight Chance Light Rain 0 to 5 mph SE 22%
Sunday 66°F Partly Sunny 0 to 3 mph WNW 8%
Sunday Night 43°F Mostly Clear 5 mph SSE 0%
Monday 72°F Sunny 5 mph SW 1%
Monday Night 46°F Mostly Clear 7 mph SW 0%
Tuesday 73°F Sunny 6 mph WSW 0%
Tuesday Night 48°F Mostly Clear 6 mph SW 1%
Wednesday 75°F Sunny 6 mph SSW 1%
Wednesday Night 49°F Mostly Clear 3 to 8 mph SSW 4%
Thursday 76°F Sunny 7 mph SSW 2%
Thursday Night 50°F Mostly Clear 5 to 10 mph S 5%
Friday 74°F Mostly Sunny 9 mph SSW 6%

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.