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.
This Afternoon
70°F
Mostly Cloudy
Mostly cloudy, with a high near 70. East wind around 6 mph.
7-day forecast for Rocky Boy West
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Mostly Cloudy | 6 mph E | 9% |
| Tonight | 47°F | Mostly Cloudy | 1 to 6 mph SE | 11% |
| Sunday | 72°F | Mostly Sunny | 1 to 5 mph SE | 4% |
| Sunday Night | 48°F | Mostly Clear | 3 to 9 mph SE | 0% |
| Monday | 77°F | Mostly Sunny | 5 mph SSE | 0% |
| Monday Night | 50°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Tuesday | 79°F | Sunny | 1 to 5 mph SSW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 1 to 5 mph SSE | 0% |
| Wednesday | 80°F | Mostly Sunny | 0 to 3 mph SSW | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph S | 7% |
| Thursday | 78°F | Mostly Sunny | 3 mph WSW | 3% |
| Thursday Night | 52°F | Partly Cloudy | 5 to 8 mph E | 8% |
| Friday | 76°F | Mostly Sunny | 6 mph SSE | 5% |
| Friday Night | 49°F | Mostly Cloudy then Chance Light Rain | 9 mph S | 26% |
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
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Big Sandy
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East End Colony
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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 Sep 19, 2026.