Fortine, MT Weather & Growing Conditions
Tonight
44°F
Partly Cloudy
Partly cloudy, with a low around 44. North northeast wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Partly Cloudy | 5 to 8 mph NNE | 6% |
| Saturday | 64°F | Sunny | 6 mph SSW | 3% |
| Saturday Night | 44°F | Partly Cloudy | 6 mph SSE | 1% |
| Sunday | 64°F | Sunny | 7 mph S | 0% |
| Sunday Night | 45°F | Clear | 6 mph SSE | 0% |
| Monday | 64°F | Sunny | 5 to 9 mph S | 0% |
| Monday Night | 46°F | Mostly Clear | 7 mph SSW | 0% |
| Tuesday | 62°F | Sunny | 7 mph SSE | 0% |
| Tuesday Night | 45°F | Partly Cloudy | 8 mph S | 1% |
| Wednesday | 59°F | Sunny | 7 to 12 mph SSW | 1% |
| Wednesday Night | 44°F | Partly Cloudy | 9 mph SSE | 1% |
| Thursday | 61°F | Mostly Sunny | 8 mph SSE | 2% |
| Thursday Night | 47°F | Partly Cloudy | 6 to 10 mph ESE | 3% |
| Friday | 60°F | Mostly Sunny | 8 mph S | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fortine, MT
Last spring frost
May 16
First fall frost
Sep 18
Growing season
121 days
Hardiness zone
5a
Explore more for Fortine, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Fortine 1 N, Mt (6.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.