Chinook, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chinook, a city in Blaine County, Montana.
Overnight
41°F
Mostly Clear
Mostly clear, with a low around 41. West wind around 6 mph.
7-day forecast for Chinook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 78°F | Sunny | 6 to 12 mph WNW | 1% |
| Tuesday Night | 48°F | Partly Cloudy | 2 to 10 mph WSW | 1% |
| Wednesday | 86°F | Mostly Sunny | 2 to 13 mph WNW | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 2 to 13 mph W | 0% |
| Thursday | 93°F | Sunny | 2 to 14 mph NNW | 0% |
| Thursday Night | 53°F | Mostly Clear | 5 to 14 mph NNE | 0% |
| Friday | 94°F | Sunny | 6 to 14 mph SE | 0% |
| Friday Night | 56°F | Mostly Clear | 12 mph NE | 0% |
| Saturday | 91°F | Sunny | 12 mph NNE | 0% |
| Saturday Night | 56°F | Partly Cloudy | 8 to 12 mph NE | 1% |
| Sunday | 89°F | Mostly Sunny | 13 mph NE | 2% |
| Sunday Night | 55°F | Partly Cloudy | 8 to 12 mph NE | 13% |
| Monday | 86°F | Mostly Sunny | 8 to 12 mph E | 13% |
Forecast source: National Weather Service (api.weather.gov) for Chinook (48.590, -109.232). Updated through the day.
Growing snapshot for Chinook
Last spring frost
May 14
First fall frost
Sep 23
Growing season
130 days
Hardiness zone
3b
More local growing data for Chinook: nearby ZIP 59523 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Chinook, Mt (4.5 mi from Chinook). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.