Chinook, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chinook, a city in Blaine County, Montana.
Tonight
29°F
Areas Of Fog
Areas of fog after 9pm. Mostly cloudy, with a low around 29. East northeast wind 0 to 3 mph.
7-day forecast for Chinook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 29°F | Areas Of Fog | 0 to 3 mph ENE | 0% |
| Wednesday | 44°F | Areas Of Fog | 2 to 8 mph WNW | 0% |
| Wednesday Night | 28°F | Areas Of Fog | 2 mph S | 0% |
| Thursday | 51°F | Areas Of Fog then Mostly Sunny | 1 to 6 mph SW | 0% |
| Thursday Night | 34°F | Partly Cloudy | 5 to 9 mph WSW | 0% |
| Friday | 54°F | Sunny | 8 to 15 mph WSW | 6% |
| Friday Night | 37°F | Partly Cloudy | 12 to 18 mph W | 10% |
| Saturday | 53°F | Sunny | 6 to 18 mph W | 0% |
| Saturday Night | 33°F | Partly Cloudy | 6 mph SSW | 0% |
| Sunday | 61°F | Mostly Sunny | 3 to 10 mph SW | 1% |
| Sunday Night | 38°F | Partly Cloudy | 8 to 13 mph W | 3% |
| Monday | 55°F | Mostly Sunny | 8 mph W | 3% |
| Monday Night | 35°F | Mostly Cloudy | 6 mph S | 2% |
| Tuesday | 59°F | Mostly Sunny | 3 to 12 mph S | 1% |
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 Nov 4, 2026.