Rocky Boy West, MT Weather & Growing Conditions
Today
75°F
Sunny
Sunny, with a high near 75. West southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 6 mph WSW | 1% |
| Tonight | 52°F | Mostly Clear | 3 to 7 mph SSW | 1% |
| Wednesday | 83°F | Mostly Sunny | 8 mph WSW | 0% |
| Wednesday Night | 55°F | Mostly Clear | 3 to 8 mph SSE | 0% |
| Thursday | 90°F | Sunny | 5 to 9 mph WSW | 0% |
| Thursday Night | 57°F | Mostly Clear | 5 to 9 mph ENE | 0% |
| Friday | 93°F | Sunny | 2 to 9 mph S | 0% |
| Friday Night | 59°F | Mostly Clear | 7 mph ENE | 0% |
| Saturday | 90°F | Sunny | 7 mph WSW | 0% |
| Saturday Night | 59°F | Partly Cloudy | 7 mph NE | 1% |
| Sunday | 87°F | Mostly Sunny | 5 to 8 mph NNE | 1% |
| Sunday Night | 58°F | Partly Cloudy | 8 mph NE | 8% |
| Monday | 84°F | Mostly Sunny | 5 to 8 mph NNE | 10% |
| Monday Night | 57°F | Partly Cloudy then Slight Chance Rain Showers | 6 to 9 mph ENE | 19% |
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 Aug 4, 2026.