Big Sky, MT Weather & Growing Conditions
Today
49°F
Partly Sunny
Partly sunny. High near 49, with temperatures falling to around 41 in the afternoon. Northwest wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Partly Sunny | 2 to 6 mph NW | 1% |
| Tonight | 26°F | Partly Cloudy | 2 to 14 mph S | 0% |
| Thursday | 42°F | Partly Sunny then Slight Chance Light Snow | 7 to 15 mph S | 20% |
| Thursday Night | 25°F | Slight Chance Light Snow then Mostly Cloudy | 8 mph S | 20% |
| Friday | 41°F | Mostly Sunny | 7 to 13 mph S | 0% |
| Friday Night | 25°F | Partly Cloudy | 10 to 14 mph S | 0% |
| Saturday | 49°F | Mostly Sunny | 8 to 13 mph S | 0% |
| Saturday Night | 29°F | Partly Cloudy | 9 to 22 mph SSE | 0% |
| Sunday | 52°F | Mostly Sunny | 13 to 22 mph S | 1% |
| Sunday Night | 30°F | Mostly Cloudy | 13 to 18 mph S | 1% |
| Monday | 51°F | Partly Sunny | 10 to 14 mph S | 2% |
| Monday Night | 31°F | Mostly Cloudy | 10 to 15 mph SSE | 2% |
| Tuesday | 51°F | Mostly Sunny | 8 to 13 mph S | 4% |
| Tuesday Night | 31°F | Partly Cloudy | 8 to 15 mph S | 8% |
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 Nov 4, 2026.