Fort Smith, MT Weather & Growing Conditions
Overnight
54°F
Showers And Thunderstorms
Showers and thunderstorms before 3am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 54, with temperatures rising to around 56 overnight. Northwest wind around 5 mph. Chance of precipitation is 90%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Showers And Thunderstorms | 5 mph NW | 90% |
| Saturday | 60°F | Patchy Fog | 5 to 12 mph NNW | 93% |
| Saturday Night | 48°F | Patchy Fog | 10 to 15 mph NW | 86% |
| Sunday | 60°F | Rain Showers | 12 mph WNW | 88% |
| Sunday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph WSW | 28% |
| Monday | 69°F | Mostly Sunny | 5 mph SE | 5% |
| Monday Night | 49°F | Mostly Clear | 7 mph SSE | 0% |
| Tuesday | 75°F | Sunny | 5 mph NE | 0% |
| Tuesday Night | 53°F | Partly Cloudy then Slight Chance Rain Showers | 6 mph S | 15% |
| Wednesday | 77°F | Mostly Sunny | 6 mph WNW | 7% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 9 mph S | 5% |
| Thursday | 79°F | Sunny | 5 to 8 mph SW | 1% |
| Thursday Night | 53°F | Mostly Clear | 3 to 8 mph SSE | 1% |
| Friday | 79°F | Mostly Sunny | 7 mph SW | 0% |
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 Sep 19, 2026.