Big Sky, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Big Sky, a community in Madison County, Montana.
Today
53°F
Areas Of Fog
Areas of fog and a chance of rain before 9am, then areas of fog and a chance of showers and thunderstorms between 9am and 10am, then areas of fog and showers and thunderstorms. Cloudy, with a high near 53. North northwest wind 0 to 3 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Big Sky
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 53°F | Areas Of Fog | 0 to 3 mph NNW | 90% |
| Tonight | 38°F | Light Rain Likely | 2 mph WNW | 59% |
| Sunday | 59°F | Chance Light Rain then Partly Sunny | 0 to 3 mph NW | 25% |
| Sunday Night | 37°F | Partly Cloudy | 2 mph S | 2% |
| Monday | 67°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 3 mph SSW | 0% |
| Tuesday | 68°F | Mostly Sunny | 0 to 3 mph WSW | 1% |
| Tuesday Night | 42°F | Partly Cloudy | 2 mph SSW | 4% |
| Wednesday | 69°F | Mostly Sunny | 1 to 5 mph SW | 8% |
| Wednesday Night | 42°F | Mostly Clear | 5 mph SSW | 3% |
| Thursday | 71°F | Sunny | 5 mph SSW | 2% |
| Thursday Night | 43°F | Mostly Clear | 6 mph S | 1% |
| Friday | 71°F | Mostly Sunny | 2 to 6 mph S | 3% |
| Friday Night | 43°F | Slight Chance Light Rain then Mostly Cloudy | 6 mph SSW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Big Sky (45.256, -111.332). Updated through the day.
Growing snapshot for Big Sky
Growing season
50 days
Hardiness zone
4b
More local growing data for Big Sky: nearby ZIP 59716 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Alder
Brandon
Ennis
Harrison
Jeffers
Mammoth
McAllister
Norris
Pony
Sheridan
Silver Star
Twin Bridges
Virginia City
Climate data from the nearest NOAA station, Big Sky 2Wnw, Mt (3.2 mi from Big Sky). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.