Circle, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Circle, a town in Mccone County, Montana.
Tonight
50°F
Patchy Fog
A chance of rain showers and patchy fog before 9pm, then patchy fog and showers and thunderstorms. Cloudy, with a low around 50. East northeast wind 8 to 12 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
7-day forecast for Circle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Patchy Fog | 8 to 12 mph ENE | 94% |
| Sunday | 62°F | Rain Showers Likely then Areas Of Smoke | 12 mph E | 69% |
| Sunday Night | 46°F | Partly Cloudy | 3 to 8 mph ESE | 5% |
| Monday | 69°F | Mostly Sunny | 5 to 13 mph SSE | 2% |
| Monday Night | 48°F | Mostly Clear | 13 mph SSE | 0% |
| Tuesday | 76°F | Sunny | 14 mph SSE | 0% |
| Tuesday Night | 52°F | Mostly Clear | 7 to 14 mph SSE | 1% |
| Wednesday | 78°F | Mostly Sunny | 6 mph SSE | 9% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph SSE | 6% |
| Thursday | 82°F | Sunny | 2 to 6 mph SSW | 1% |
| Thursday Night | 56°F | Mostly Clear | 5 to 12 mph SE | 2% |
| Friday | 82°F | Mostly Sunny | 13 to 17 mph SSE | 2% |
| Friday Night | 53°F | Partly Cloudy | 12 to 15 mph SE | 6% |
| Saturday | 73°F | Mostly Sunny | 9 to 14 mph ENE | 10% |
Forecast source: National Weather Service (api.weather.gov) for Circle (47.418, -105.587). Updated through the day.
Growing snapshot for Circle
Last spring frost
May 17
First fall frost
Sep 22
Growing season
126 days
Hardiness zone
4a
More local growing data for Circle: nearby ZIP 59215 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Circle, Mt (10.8 mi from Circle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.