Chinook, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chinook, a city in Blaine County, Montana.
This Afternoon
76°F
Mostly Sunny
Mostly sunny, with a high near 76. North wind around 9 mph.
7-day forecast for Chinook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Mostly Sunny | 9 mph N | 1% |
| Tonight | 50°F | Mostly Cloudy | 3 to 9 mph ENE | 2% |
| Saturday | 70°F | Cloudy | 3 to 10 mph ENE | 6% |
| Saturday Night | 50°F | Mostly Cloudy | 6 to 9 mph ESE | 4% |
| Sunday | 71°F | Partly Sunny | 6 to 12 mph ESE | 1% |
| Sunday Night | 49°F | Mostly Clear | 9 to 14 mph ESE | 0% |
| Monday | 76°F | Sunny | 9 to 13 mph SE | 0% |
| Monday Night | 50°F | Mostly Clear | 5 to 13 mph SE | 0% |
| Tuesday | 78°F | Sunny | 2 to 7 mph SW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 5 mph SW | 1% |
| Wednesday | 79°F | Sunny | 2 to 8 mph SW | 2% |
| Wednesday Night | 50°F | Mostly Clear | 6 mph SE | 1% |
| Thursday | 79°F | Sunny | 3 to 8 mph SE | 2% |
| Thursday Night | 52°F | Partly Cloudy | 9 mph SE | 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 Sep 18, 2026.