Forty Mile Colony, MT Weather & Growing Conditions
Today
77°F
Patchy Smoke
Patchy smoke. Sunny. High near 77, with temperatures falling to around 75 in the afternoon. East wind 3 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Patchy Smoke | 3 to 8 mph E | 1% |
| Tonight | 52°F | Patchy Smoke then Mostly Clear | 8 mph ESE | 13% |
| Wednesday | 85°F | Sunny | 3 to 8 mph N | 0% |
| Wednesday Night | 55°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Thursday | 94°F | Sunny | 3 to 9 mph W | 0% |
| Thursday Night | 60°F | Mostly Clear | 5 to 8 mph SE | 0% |
| Friday | 98°F | Sunny | 2 to 7 mph WNW | 0% |
| Friday Night | 63°F | Mostly Clear | 9 mph SW | 0% |
| Saturday | 95°F | Sunny | 6 to 12 mph NW | 0% |
| Saturday Night | 63°F | Mostly Clear | 6 to 9 mph ESE | 0% |
| Sunday | 94°F | Sunny | 3 to 12 mph NNW | 0% |
| Sunday Night | 63°F | Partly Cloudy | 5 to 9 mph E | 5% |
| Monday | 92°F | Mostly Sunny | 3 to 10 mph N | 2% |
| Monday Night | 63°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 to 10 mph E | 15% |
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 Aug 4, 2026.