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.
Overnight
43°F
Patchy Smoke
Patchy smoke before 3am. Mostly clear, with a low around 43. North northeast wind 0 to 3 mph.
7-day forecast for Big Timber
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Patchy Smoke | 0 to 3 mph NNE | 0% |
| Tuesday | 77°F | Sunny then Patchy Smoke | 0 to 8 mph ENE | 0% |
| Tuesday Night | 48°F | Patchy Smoke then Mostly Clear | 1 to 7 mph NE | 1% |
| Wednesday | 88°F | Sunny | 3 to 14 mph W | 0% |
| Wednesday Night | 53°F | Mostly Clear | 2 to 12 mph WNW | 0% |
| Thursday | 94°F | Sunny | 3 to 17 mph W | 0% |
| Thursday Night | 58°F | Mostly Clear | 1 to 14 mph NW | 0% |
| Friday | 99°F | Sunny | 2 to 17 mph WSW | 0% |
| Friday Night | 61°F | Mostly Clear | 8 to 18 mph WNW | 0% |
| Saturday | 97°F | Sunny | 9 to 18 mph W | 0% |
| Saturday Night | 60°F | Partly Cloudy | 5 to 16 mph NNW | 3% |
| Sunday | 95°F | Sunny | 3 to 10 mph NNW | 3% |
| Sunday Night | 59°F | Partly Cloudy | 6 to 14 mph NNE | 14% |
| Monday | 92°F | Sunny | 3 to 10 mph NNE | 6% |
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 Aug 4, 2026.