Rocky Boy West, MT Weather & Growing Conditions
Tonight
52°F
Mostly Cloudy
Mostly cloudy, with a low around 52. East northeast wind 6 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Cloudy | 6 to 9 mph ENE | 3% |
| Saturday | 69°F | Cloudy | 6 to 9 mph ENE | 5% |
| Saturday Night | 50°F | Mostly Cloudy then Patchy Fog | 1 to 8 mph E | 4% |
| Sunday | 71°F | Patchy Fog then Mostly Sunny | 0 to 3 mph SSE | 1% |
| Sunday Night | 49°F | Mostly Clear | 3 to 9 mph SE | 0% |
| Monday | 76°F | Sunny | 5 mph SSE | 0% |
| Monday Night | 52°F | Mostly Clear | 2 to 8 mph SSE | 0% |
| Tuesday | 76°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 52°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 77°F | Sunny | 1 to 6 mph SW | 1% |
| Wednesday Night | 52°F | Mostly Clear | 3 mph SSE | 1% |
| Thursday | 77°F | Sunny | 3 mph SSW | 2% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph ESE | 2% |
| Friday | 78°F | Mostly Sunny | 5 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rocky Boy West, MT
Last spring frost
May 17
First fall frost
Sep 25
Growing season
128 days
Hardiness zone
4a
Explore more for Rocky Boy West, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Big Sandy, Mt (12.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.