Chinook, MT Weather & Growing Conditions
Tonight
30°F
Patchy Fog
Patchy fog. Mostly cloudy, with a low around 30. West wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Patchy Fog | 1 to 5 mph W | 0% |
| Wednesday | 44°F | Patchy Fog | 3 to 9 mph WNW | 0% |
| Wednesday Night | 29°F | Areas Of Fog | 3 mph SSW | 0% |
| Thursday | 51°F | Areas Of Fog then Mostly Sunny | 1 to 6 mph SW | 0% |
| Thursday Night | 35°F | Partly Cloudy | 5 to 12 mph WSW | 0% |
| Friday | 54°F | Sunny | 9 to 16 mph WSW | 6% |
| Friday Night | 38°F | Partly Cloudy | 13 to 21 mph WSW | 10% |
| Saturday | 53°F | Sunny | 6 to 20 mph W | 0% |
| Saturday Night | 34°F | Partly Cloudy | 7 mph SSW | 0% |
| Sunday | 62°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Sunday Night | 39°F | Partly Cloudy | 9 to 14 mph W | 2% |
| Monday | 54°F | Mostly Sunny | 6 to 9 mph W | 2% |
| Monday Night | 36°F | Mostly Cloudy | 7 mph S | 2% |
| Tuesday | 59°F | Mostly Sunny | 5 to 12 mph SSW | 1% |
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 Nov 4, 2026.