Rocky Boy's Agency, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rocky Boy's Agency, a community in Hill County, Montana.
Today
67°F
Mostly Cloudy
Mostly cloudy, with a high near 67. East wind around 7 mph.
7-day forecast for Rocky Boy's Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Mostly Cloudy | 7 mph E | 11% |
| Tonight | 46°F | Mostly Cloudy | 6 mph ESE | 12% |
| Sunday | 69°F | Mostly Sunny | 5 mph SSE | 6% |
| Sunday Night | 46°F | Mostly Clear | 5 to 8 mph SE | 0% |
| Monday | 73°F | Sunny | 5 mph SSE | 0% |
| Monday Night | 49°F | Mostly Clear | 3 to 8 mph SSE | 0% |
| Tuesday | 75°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 2 mph SSE | 0% |
| Wednesday | 77°F | Sunny | 1 to 5 mph SSW | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph SSE | 3% |
| Thursday | 77°F | Sunny | 5 mph SW | 2% |
| Thursday Night | 52°F | Partly Cloudy | 3 to 8 mph SE | 9% |
| Friday | 75°F | Mostly Sunny | 6 mph S | 6% |
| Friday Night | 46°F | Slight Chance Light Rain | 6 mph NE | 22% |
Forecast source: National Weather Service (api.weather.gov) for Rocky Boy's Agency (48.261, -109.775). Updated through the day.
Growing snapshot for Rocky Boy's Agency
Last spring frost
May 17
First fall frost
Sep 25
Growing season
128 days
Hardiness zone
4a
More local growing data for Rocky Boy's Agency: 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 West
Rudyard
Saddle Butte
Sangrey
St. Pierre
West Havre
Climate data from the nearest NOAA station, Big Sandy, Mt (12.8 mi from Rocky Boy's Agency). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.