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
73°F
Sunny
Sunny, with a high near 73. West wind 3 to 7 mph.
7-day forecast for Rocky Boy's Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 3 to 7 mph W | 1% |
| Tonight | 50°F | Mostly Clear | 2 to 6 mph SW | 1% |
| Wednesday | 81°F | Mostly Sunny | 5 to 8 mph WSW | 0% |
| Wednesday Night | 53°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Thursday | 88°F | Sunny | 5 to 9 mph WSW | 0% |
| Thursday Night | 55°F | Mostly Clear | 5 to 9 mph NE | 0% |
| Friday | 91°F | Sunny | 3 to 10 mph SSW | 0% |
| Friday Night | 58°F | Mostly Clear | 7 mph ESE | 0% |
| Saturday | 88°F | Sunny | 5 to 8 mph WSW | 0% |
| Saturday Night | 58°F | Partly Cloudy | 7 mph ENE | 1% |
| Sunday | 85°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Sunday Night | 56°F | Partly Cloudy | 7 mph NE | 8% |
| Monday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 8 mph NE | 15% |
| Monday Night | 55°F | Partly Cloudy then Slight Chance Rain Showers | 8 mph E | 20% |
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
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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 Aug 4, 2026.