Fort Benton, MT Weather & Growing Conditions
Tonight
28°F
Patchy Fog
Patchy fog after 9pm. Mostly cloudy, with a low around 28. West northwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 28°F | Patchy Fog | 3 mph WNW | 0% |
| Wednesday | 46°F | Patchy Fog | 1 to 5 mph WSW | 0% |
| Wednesday Night | 28°F | Patchy Fog | 2 mph SSW | 0% |
| Thursday | 55°F | Patchy Fog then Mostly Sunny | 2 to 9 mph SW | 0% |
| Thursday Night | 34°F | Mostly Clear | 10 mph WSW | 1% |
| Friday | 56°F | Mostly Sunny | 10 to 21 mph SW | 2% |
| Friday Night | 37°F | Partly Cloudy | 16 to 20 mph WSW | 4% |
| Saturday | 55°F | Mostly Sunny | 5 to 16 mph WSW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 5 mph SW | 0% |
| Sunday | 62°F | Mostly Sunny | 3 to 14 mph SW | 1% |
| Sunday Night | 38°F | Mostly Cloudy | 5 to 14 mph WSW | 1% |
| Monday | 55°F | Partly Sunny | 6 mph SW | 2% |
| Monday Night | 37°F | Mostly Cloudy | 6 mph S | 2% |
| Tuesday | 59°F | Mostly Sunny | 6 to 12 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fort Benton, MT
Last spring frost
May 15
First fall frost
Sep 22
Growing season
129 days
Hardiness zone
4a
Explore more for Fort Benton, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Ft Benton, Mt (6.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.