Circle, MT Weather & Growing Conditions
Overnight
28°F
Partly Cloudy
Partly cloudy, with a low around 28. Southwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Partly Cloudy | 1 mph SW | 0% |
| Wednesday | 49°F | Mostly Sunny | 0 to 6 mph WNW | 0% |
| Wednesday Night | 28°F | Mostly Cloudy | 2 mph ESE | 0% |
| Thursday | 54°F | Mostly Sunny | 1 to 8 mph S | 0% |
| Thursday Night | 32°F | Partly Cloudy | 5 mph WSW | 0% |
| Friday | 52°F | Sunny | 5 to 10 mph WSW | 0% |
| Friday Night | 35°F | Partly Cloudy | 6 to 10 mph SW | 0% |
| Saturday | 55°F | Sunny | 3 to 13 mph W | 0% |
| Saturday Night | 33°F | Mostly Clear | 2 to 7 mph SW | 0% |
| Sunday | 63°F | Mostly Sunny | 7 to 14 mph SW | 0% |
| Sunday Night | 38°F | Partly Cloudy | 5 to 8 mph W | 1% |
| Monday | 55°F | Sunny | 3 to 9 mph WNW | 1% |
| Monday Night | 34°F | Partly Cloudy | 3 mph SW | 1% |
| Tuesday | 57°F | Mostly Sunny | 3 to 9 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Circle, MT
Last spring frost
May 17
First fall frost
Sep 22
Growing season
126 days
Hardiness zone
4a
Explore more for Circle, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Circle, Mt (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.