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.
This Afternoon
54°F
Sunny
Sunny. High near 54, with temperatures falling to around 48 in the afternoon. South southwest wind 5 to 9 mph.
7-day forecast for Big Timber
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Sunny | 5 to 9 mph SSW | 0% |
| Tonight | 29°F | Mostly Clear | 5 mph W | 0% |
| Wednesday | 55°F | Mostly Sunny | 1 to 5 mph WSW | 0% |
| Wednesday Night | 30°F | Mostly Clear | 1 to 7 mph SW | 0% |
| Thursday | 57°F | Mostly Sunny | 7 to 14 mph WSW | 3% |
| Thursday Night | 32°F | Partly Cloudy | 7 to 13 mph W | 3% |
| Friday | 57°F | Sunny | 13 to 20 mph WSW | 4% |
| Friday Night | 37°F | Partly Cloudy | 14 to 23 mph WSW | 4% |
| Saturday | 61°F | Sunny | 6 to 21 mph WSW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 6 to 13 mph WSW | 0% |
| Sunday | 66°F | Mostly Sunny | 10 to 16 mph WSW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 7 to 15 mph WSW | 0% |
| Monday | 59°F | Mostly Sunny | 3 to 7 mph SSW | 1% |
| Monday Night | 37°F | Partly Cloudy | 3 to 9 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 Nov 3, 2026.