Fort Smith, MT Weather & Growing Conditions
This Afternoon
49°F
Sunny
Sunny. High near 49, with temperatures falling to around 44 in the afternoon. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Sunny | 6 mph SW | 0% |
| Tonight | 33°F | Patchy Fog | 2 to 8 mph SW | 0% |
| Wednesday | 49°F | Mostly Sunny | 5 mph N | 0% |
| Wednesday Night | 33°F | Patchy Fog | 2 to 8 mph S | 0% |
| Thursday | 55°F | Mostly Sunny | 1 to 8 mph W | 1% |
| Thursday Night | 33°F | Partly Cloudy | 1 to 7 mph WSW | 3% |
| Friday | 53°F | Sunny | 5 to 12 mph SW | 3% |
| Friday Night | 39°F | Partly Cloudy | 9 to 20 mph SW | 5% |
| Saturday | 57°F | Sunny | 7 to 15 mph SW | 1% |
| Saturday Night | 40°F | Mostly Clear | 7 to 21 mph SSW | 0% |
| Sunday | 65°F | Mostly Sunny | 13 to 24 mph SW | 0% |
| Sunday Night | 40°F | Partly Cloudy | 3 to 14 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 5 mph SSE | 1% |
| Monday Night | 41°F | Mostly Cloudy | 3 to 7 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fort Smith, MT
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5a
Explore more for Fort Smith, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Yellowtail Dam, Mt (0.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.