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
29°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 29. Wind around 0 mph.
7-day forecast for Rocky Boy West
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Patchy Fog | 0 mph | 0% |
| Wednesday | 43°F | Patchy Fog then Sunny | 2 mph WNW | 0% |
| Wednesday Night | 29°F | Partly Cloudy | 1 to 5 mph SSE | 0% |
| Thursday | 50°F | Mostly Sunny | 5 to 9 mph SSW | 0% |
| Thursday Night | 33°F | Partly Cloudy | 8 mph SW | 2% |
| Friday | 52°F | Mostly Sunny | 8 to 13 mph SSW | 1% |
| Friday Night | 37°F | Partly Cloudy | 8 to 13 mph SW | 1% |
| Saturday | 56°F | Mostly Sunny | 3 to 8 mph SSW | 0% |
| Saturday Night | 39°F | Partly Cloudy | 3 to 7 mph S | 0% |
| Sunday | 61°F | Partly Sunny | 7 to 14 mph SW | 1% |
| Sunday Night | 37°F | Partly Cloudy | 5 to 14 mph W | 1% |
| Monday | 53°F | Mostly Sunny | 5 mph SW | 0% |
| Monday Night | 36°F | Mostly Cloudy | 3 to 7 mph S | 1% |
| Tuesday | 58°F | Mostly Sunny | 7 to 10 mph SW | 0% |
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 Nov 4, 2026.