Chinook, MT Weather & Growing Conditions
Overnight
42°F
Mostly Clear
Mostly clear, with a low around 42. West southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 7 mph WSW | 0% |
| Tuesday | 78°F | Sunny | 7 to 12 mph WNW | 1% |
| Tuesday Night | 50°F | Mostly Clear | 3 to 10 mph WSW | 1% |
| Wednesday | 85°F | Mostly Sunny | 3 to 14 mph W | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 13 mph WSW | 0% |
| Thursday | 91°F | Sunny | 3 to 14 mph NW | 0% |
| Thursday Night | 55°F | Mostly Clear | 5 to 14 mph NNE | 0% |
| Friday | 95°F | Sunny | 6 to 15 mph E | 0% |
| Friday Night | 58°F | Mostly Clear | 13 mph NE | 0% |
| Saturday | 91°F | Sunny | 13 mph NE | 0% |
| Saturday Night | 58°F | Partly Cloudy | 12 mph NE | 1% |
| Sunday | 88°F | Mostly Sunny | 10 to 14 mph NE | 2% |
| Sunday Night | 57°F | Partly Cloudy | 8 to 12 mph NE | 13% |
| Monday | 86°F | Mostly Sunny | 8 to 13 mph E | 14% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chinook, MT
Last spring frost
May 14
First fall frost
Sep 23
Growing season
130 days
Hardiness zone
3b
Explore more for Chinook, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Chinook, Mt (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.