Square Butte, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Square Butte, a community in Chouteau County, Montana.
Overnight
54°F
Cloudy
Cloudy, with a low around 54. East wind around 3 mph.
7-day forecast for Square Butte
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Cloudy | 3 mph E | 12% |
| Saturday | 67°F | Cloudy | 2 to 7 mph ENE | 10% |
| Saturday Night | 50°F | Mostly Cloudy then Slight Chance Light Rain | 3 to 7 mph SSE | 17% |
| Sunday | 70°F | Mostly Sunny | 3 to 8 mph SE | 4% |
| Sunday Night | 48°F | Mostly Clear | 5 to 9 mph SE | 0% |
| Monday | 79°F | Sunny | 6 mph SSE | 0% |
| Monday Night | 51°F | Mostly Clear | 3 to 7 mph S | 0% |
| Tuesday | 79°F | Sunny | 2 to 6 mph W | 0% |
| Tuesday Night | 53°F | Mostly Clear | 6 mph S | 0% |
| Wednesday | 80°F | Sunny | 5 mph SSW | 1% |
| Wednesday Night | 54°F | Mostly Clear | 5 to 8 mph S | 4% |
| Thursday | 81°F | Sunny | 2 to 7 mph SE | 3% |
| Thursday Night | 54°F | Mostly Clear | 8 to 12 mph SSE | 5% |
| Friday | 79°F | Mostly Sunny | 3 to 10 mph S | 3% |
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 Sep 19, 2026.