Boneau, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Boneau, a community in Hill County, Montana.
Today
44°F
Sunny
Sunny. High near 44, with temperatures falling to around 38 in the afternoon. West wind around 2 mph.
7-day forecast for Boneau
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 44°F | Sunny | 2 mph W | 0% |
| Tonight | 31°F | Partly Cloudy | 3 mph SSE | 0% |
| Thursday | 50°F | Mostly Sunny | 3 to 9 mph SSW | 1% |
| Thursday Night | 34°F | Partly Cloudy | 7 to 10 mph SW | 3% |
| Friday | 51°F | Sunny | 10 to 14 mph SW | 2% |
| Friday Night | 38°F | Partly Cloudy | 10 to 15 mph SW | 2% |
| Saturday | 56°F | Sunny | 3 to 10 mph SW | 0% |
| Saturday Night | 41°F | Partly Cloudy | 3 to 8 mph S | 1% |
| Sunday | 61°F | Partly Sunny | 8 to 14 mph SW | 1% |
| Sunday Night | 38°F | Partly Cloudy | 6 to 15 mph WSW | 1% |
| Monday | 52°F | Mostly Sunny | 6 mph SW | 0% |
| Monday Night | 38°F | Mostly Cloudy | 3 to 8 mph S | 1% |
| Tuesday | 57°F | Mostly Sunny | 8 to 12 mph SW | 1% |
| Tuesday Night | 40°F | Partly Cloudy | 8 mph SW | 1% |
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 Nov 4, 2026.