Harman US

Forty Mile Colony, MT Weather & Growing Conditions

Today
62°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 62, with temperatures falling to around 60 in the afternoon. Northwest wind around 10 mph. Chance of precipitation is 90%.

7-day forecast

WhenTempForecastWindPrecip
Today 62°F Showers And Thunderstorms 10 mph NW 92%
Tonight 48°F Patchy Fog 12 mph NW 88%
Sunday 62°F Rain Showers 12 mph WNW 81%
Sunday Night 46°F Chance Rain Showers then Mostly Cloudy 2 to 6 mph WSW 32%
Monday 71°F Mostly Sunny 5 mph SE 3%
Monday Night 47°F Mostly Clear 5 to 8 mph SSE 0%
Tuesday 79°F Sunny 6 mph ENE 0%
Tuesday Night 50°F Mostly Clear then Slight Chance Rain Showers 5 mph SE 15%
Wednesday 79°F Mostly Sunny 6 mph ESE 5%
Wednesday Night 51°F Partly Cloudy 2 to 6 mph SSE 4%
Thursday 82°F Sunny 6 mph ESE 1%
Thursday Night 51°F Mostly Clear 3 to 8 mph SE 1%
Friday 82°F Mostly Sunny 3 to 7 mph S 1%
Friday Night 51°F Partly Cloudy 2 to 7 mph SSE 9%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Forty Mile Colony, MT

Last spring frost
May 21
First fall frost
Sep 17
Growing season
117 days
Hardiness zone
5a

Explore more for Forty Mile Colony, MT: full frost dates · planting calendar · Montana frost dates

Climate data from the nearest NOAA station, Wyola 1 Sw, Mt (10.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.