Fort Benton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fort Benton, a city in Chouteau County, Montana.
This Afternoon
52°F
Mostly Sunny
Mostly sunny. High near 52, with temperatures falling to around 46 in the afternoon. East wind around 3 mph.
7-day forecast for Fort Benton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Mostly Sunny | 3 mph E | 0% |
| Tonight | 29°F | Patchy Fog | 1 to 5 mph SSW | 0% |
| Wednesday | 48°F | Patchy Fog then Mostly Sunny | 1 to 6 mph WSW | 0% |
| Wednesday Night | 28°F | Patchy Fog | 2 mph SSW | 0% |
| Thursday | 56°F | Patchy Fog then Mostly Sunny | 2 to 10 mph SW | 0% |
| Thursday Night | 35°F | Partly Cloudy | 8 to 12 mph WSW | 1% |
| Friday | 57°F | Mostly Sunny | 10 to 23 mph SW | 2% |
| Friday Night | 37°F | Partly Cloudy | 15 to 22 mph WSW | 4% |
| Saturday | 56°F | Mostly Sunny | 5 to 15 mph WSW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 6 mph SW | 0% |
| Sunday | 63°F | Mostly Sunny | 3 to 14 mph SW | 1% |
| Sunday Night | 38°F | Mostly Cloudy | 5 to 13 mph WSW | 1% |
| Monday | 56°F | Partly Sunny | 6 mph SW | 2% |
| Monday Night | 38°F | Mostly Cloudy | 6 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for Fort Benton (47.829, -110.656). Updated through the day.
Growing snapshot for Fort Benton
Last spring frost
May 15
First fall frost
Sep 22
Growing season
129 days
Hardiness zone
4a
More local growing data for Fort Benton: nearby ZIP 59442 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Carter
Floweree
Geraldine
Highwood
Loma
Riverview Colony
Square Butte
Sunnybrook Colony
Twin Hills Colony
Climate data from the nearest NOAA station, Ft Benton, Mt (6.8 mi from Fort Benton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.