Fort Smith, MT Weather & Growing Conditions
Overnight
46°F
Patchy Smoke
Patchy smoke. Mostly clear. Low around 46, with temperatures rising to around 48 overnight. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Patchy Smoke | 3 mph SE | 0% |
| Tuesday | 74°F | Patchy Smoke | 2 to 12 mph E | 1% |
| Tuesday Night | 52°F | Patchy Smoke | 5 to 12 mph ESE | 12% |
| Wednesday | 83°F | Sunny | 3 to 9 mph NNW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 5 to 9 mph SSW | 0% |
| Thursday | 90°F | Sunny | 2 to 10 mph W | 0% |
| Thursday Night | 63°F | Mostly Clear | 5 to 9 mph S | 0% |
| Friday | 96°F | Sunny | 2 to 7 mph W | 0% |
| Friday Night | 65°F | Mostly Clear | 9 mph SW | 0% |
| Saturday | 93°F | Sunny | 6 to 12 mph NW | 0% |
| Saturday Night | 65°F | Mostly Clear | 5 to 9 mph SE | 0% |
| Sunday | 91°F | Sunny | 6 to 10 mph NNW | 0% |
| Sunday Night | 64°F | Partly Cloudy | 6 to 10 mph E | 6% |
| Monday | 89°F | Mostly Sunny | 5 to 12 mph N | 2% |
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 Aug 4, 2026.