Big Sky, MT Weather & Growing Conditions
Today
75°F
Areas Of Smoke
Areas of smoke. Sunny, with a high near 75. North northwest wind 6 to 13 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Areas Of Smoke | 6 to 13 mph NNW | 0% |
| Tonight | 43°F | Patchy Smoke | 3 to 13 mph N | 0% |
| Wednesday | 82°F | Patchy Smoke | 3 to 10 mph SW | 0% |
| Wednesday Night | 46°F | Patchy Smoke then Mostly Clear | 3 to 10 mph W | 0% |
| Thursday | 86°F | Sunny | 5 to 13 mph SW | 0% |
| Thursday Night | 51°F | Mostly Clear | 3 to 13 mph N | 0% |
| Friday | 90°F | Sunny | 3 to 18 mph SSW | 0% |
| Friday Night | 52°F | Mostly Clear | 5 to 20 mph NW | 0% |
| Saturday | 88°F | Sunny | 3 to 18 mph SW | 3% |
| Saturday Night | 52°F | Partly Cloudy | 5 to 15 mph NW | 1% |
| Sunday | 88°F | Sunny | 3 to 13 mph SW | 5% |
| Sunday Night | 50°F | Partly Cloudy | 5 to 14 mph WNW | 4% |
| Monday | 86°F | Sunny | 3 to 13 mph WNW | 4% |
| Monday Night | 50°F | Partly Cloudy | 6 to 14 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Big Sky, MT
Last spring frost
Jun 15
First fall frost
Sep 10
Growing season
87 days
Hardiness zone
5a
Explore more for Big Sky, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Hebgen Dam, Mt (13.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.