Boneau, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Boneau, a community in Hill County, Montana.
This Afternoon
72°F
Mostly Sunny
Mostly sunny, with a high near 72. North wind around 9 mph.
7-day forecast for Boneau
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Sunny | 9 mph N | 2% |
| Tonight | 53°F | Mostly Cloudy | 7 to 10 mph ENE | 3% |
| Saturday | 68°F | Cloudy | 9 mph E | 4% |
| Saturday Night | 50°F | Mostly Cloudy then Patchy Fog | 1 to 8 mph ESE | 6% |
| Sunday | 71°F | Patchy Fog then Mostly Sunny | 3 mph SE | 2% |
| Sunday Night | 50°F | Mostly Clear | 5 to 9 mph SE | 0% |
| Monday | 75°F | Sunny | 5 mph SSE | 0% |
| Monday Night | 52°F | Mostly Clear | 2 to 9 mph SSE | 0% |
| Tuesday | 76°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 53°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 76°F | Sunny | 1 to 6 mph SW | 1% |
| Wednesday Night | 53°F | Mostly Clear | 5 mph S | 1% |
| Thursday | 77°F | Sunny | 5 mph SSW | 1% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 8 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Boneau (48.295, -109.874). Updated through the day.
Growing snapshot for Boneau
Last spring frost
May 17
First fall frost
Sep 25
Growing season
128 days
Hardiness zone
4a
More local growing data for Boneau: 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 Boneau). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.