Big Timber, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Big Timber, a city in Sweet Grass County, Montana.
Tonight
52°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 52, with temperatures rising to around 55 overnight. North wind around 5 mph. Chance of precipitation is 100%.
7-day forecast for Big Timber
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Showers And Thunderstorms | 5 mph N | 99% |
| Saturday | 59°F | Showers And Thunderstorms | 5 to 9 mph NNW | 97% |
| Saturday Night | 49°F | Rain Showers | 5 mph NW | 90% |
| Sunday | 66°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph WNW | 52% |
| Sunday Night | 46°F | Mostly Cloudy | 0 to 3 mph SSE | 8% |
| Monday | 74°F | Sunny | 1 to 5 mph SSW | 0% |
| Monday Night | 49°F | Mostly Clear | 3 to 7 mph SSW | 0% |
| Tuesday | 78°F | Mostly Sunny | 2 to 6 mph SW | 2% |
| Tuesday Night | 51°F | Partly Cloudy | 5 mph SSW | 4% |
| Wednesday | 78°F | Sunny | 3 to 8 mph WSW | 4% |
| Wednesday Night | 51°F | Mostly Clear | 5 mph SSW | 3% |
| Thursday | 79°F | Sunny | 6 mph SSW | 1% |
| Thursday Night | 51°F | Mostly Clear | 2 to 7 mph SSW | 1% |
| Friday | 80°F | Mostly Sunny | 7 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Big Timber (45.835, -109.948). Updated through the day.
Growing snapshot for Big Timber
Last spring frost
May 14
First fall frost
Sep 26
Growing season
133 days
Hardiness zone
5a
More local growing data for Big Timber: nearby ZIP 59011 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Big Timber, Mt (6.4 mi from Big Timber). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.