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.
Overnight
31°F
Clear
Clear, with a low around 31. Wind around 0 mph.
7-day forecast for Rocky Boy's Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 31°F | Clear | 0 mph | 0% |
| Wednesday | 46°F | Sunny | 0 to 3 mph W | 0% |
| Wednesday Night | 30°F | Mostly Clear | 1 to 5 mph SE | 0% |
| Thursday | 50°F | Mostly Sunny | 5 to 9 mph SW | 1% |
| Thursday Night | 32°F | Partly Cloudy | 8 mph SW | 3% |
| Friday | 50°F | Sunny | 8 to 13 mph SW | 2% |
| Friday Night | 37°F | Partly Cloudy | 9 to 13 mph SW | 2% |
| Saturday | 55°F | Sunny | 2 to 10 mph SW | 0% |
| Saturday Night | 39°F | Partly Cloudy | 2 to 7 mph S | 1% |
| Sunday | 60°F | Partly Sunny | 7 to 13 mph SW | 1% |
| Sunday Night | 37°F | Partly Cloudy | 5 to 14 mph W | 1% |
| Monday | 51°F | Mostly Sunny | 2 to 6 mph WSW | 0% |
| Monday Night | 37°F | Mostly Cloudy | 2 to 6 mph S | 1% |
| Tuesday | 57°F | Mostly Sunny | 6 to 10 mph SW | 1% |
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 Nov 4, 2026.