Rocky Boy West, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rocky Boy West, a community in Hill County, Montana.
Overnight
41°F
Mostly Clear
Mostly clear. Low around 41, with temperatures rising to around 44 overnight. South southwest wind around 2 mph.
7-day forecast for Rocky Boy West
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Mostly Clear | 2 mph SSW | 0% |
| Tuesday | 76°F | Sunny | 5 mph SW | 1% |
| Tuesday Night | 50°F | Mostly Clear | 6 mph S | 1% |
| Wednesday | 84°F | Mostly Sunny | 7 mph WSW | 0% |
| Wednesday Night | 53°F | Mostly Clear | 3 to 8 mph SE | 0% |
| Thursday | 92°F | Sunny | 5 to 9 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 3 to 9 mph ENE | 0% |
| Friday | 94°F | Sunny | 2 to 9 mph SSW | 0% |
| Friday Night | 57°F | Mostly Clear | 7 mph ENE | 0% |
| Saturday | 91°F | Sunny | 6 mph WSW | 0% |
| Saturday Night | 58°F | Partly Cloudy | 7 mph NE | 0% |
| Sunday | 88°F | Mostly Sunny | 7 mph NNE | 1% |
| Sunday Night | 57°F | Partly Cloudy | 8 mph NE | 8% |
| Monday | 86°F | Mostly Sunny | 3 to 7 mph NNE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Rocky Boy West (48.297, -109.992). Updated through the day.
Growing snapshot for Rocky Boy West
Last spring frost
May 17
First fall frost
Sep 25
Growing season
128 days
Hardiness zone
4a
More local growing data for Rocky Boy West: nearby ZIP 59521 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Azure
Beaver Creek
Big Sandy
Boneau
Box Elder
East End Colony
Gildford
Gildford Colony
Hartland Colony
Havre
Havre North
Herron
Hilldale Colony
Hingham
Inverness
Joplin
Kremlin
Laredo
Parker School
Rocky Boy's Agency
Rudyard
Saddle Butte
Sangrey
St. Pierre
West Havre
Climate data from the nearest NOAA station, Big Sandy, Mt (12.8 mi from Rocky Boy West). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.