Rocky Boy West, MT Weather & Growing Conditions
This Afternoon
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 44 in the afternoon. North northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 2 mph NNE | 0% |
| Tonight | 30°F | Mostly Cloudy then Patchy Fog | 1 mph WNW | 0% |
| Wednesday | 43°F | Patchy Fog | 2 mph WSW | 0% |
| Wednesday Night | 29°F | Patchy Fog then Partly Cloudy | 2 mph S | 0% |
| Thursday | 50°F | Mostly Sunny | 2 to 9 mph SSW | 1% |
| Thursday Night | 33°F | Partly Cloudy | 5 to 10 mph SW | 2% |
| Friday | 52°F | Sunny | 10 to 15 mph SW | 5% |
| Friday Night | 35°F | Partly Cloudy | 14 mph SW | 11% |
| Saturday | 51°F | Sunny | 5 to 13 mph SW | 1% |
| Saturday Night | 37°F | Partly Cloudy | 5 to 8 mph SSW | 0% |
| Sunday | 59°F | Partly Sunny | 8 to 12 mph SSW | 2% |
| Sunday Night | 37°F | Mostly Cloudy | 6 to 12 mph WSW | 2% |
| Monday | 53°F | Mostly Sunny | 6 mph SW | 2% |
| Monday Night | 37°F | Mostly Cloudy | 5 to 8 mph S | 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 Nov 4, 2026.