Square Butte, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Square Butte, a community in Chouteau County, Montana.
Tonight
31°F
Partly Cloudy
Partly cloudy, with a low around 31. West wind around 3 mph.
7-day forecast for Square Butte
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Partly Cloudy | 3 mph W | 0% |
| Wednesday | 47°F | Mostly Sunny | 0 to 3 mph NW | 0% |
| Wednesday Night | 30°F | Mostly Clear | 0 to 5 mph SSW | 0% |
| Thursday | 54°F | Mostly Sunny | 5 mph WSW | 0% |
| Thursday Night | 36°F | Partly Cloudy | 3 to 15 mph WSW | 0% |
| Friday | 56°F | Sunny | 9 to 17 mph WSW | 2% |
| Friday Night | 39°F | Partly Cloudy | 12 to 28 mph WSW | 5% |
| Saturday | 54°F | Mostly Sunny | 3 to 24 mph W | 1% |
| Saturday Night | 36°F | Partly Cloudy | 3 to 7 mph SW | 0% |
| Sunday | 64°F | Mostly Sunny | 6 mph SW | 1% |
| Sunday Night | 39°F | Mostly Cloudy | 6 to 9 mph WSW | 1% |
| Monday | 55°F | Partly Sunny | 6 mph WSW | 2% |
| Monday Night | 39°F | Mostly Cloudy | 3 to 7 mph S | 2% |
| Tuesday | 61°F | Mostly Sunny | 7 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Square Butte (47.514, -110.199). Updated through the day.
Growing snapshot for Square Butte
Last spring frost
May 14
First fall frost
Sep 26
Growing season
134 days
Hardiness zone
4b
More local growing data for Square Butte: nearby ZIP 59446 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Carter
Floweree
Fort Benton
Geraldine
Highwood
Loma
Riverview Colony
Sunnybrook Colony
Twin Hills Colony
Climate data from the nearest NOAA station, Geraldine, Mt (6.3 mi from Square Butte). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.