Boneau, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Boneau, a community in Hill County, Montana.
Today
75°F
Sunny
Sunny, with a high near 75. West wind 3 to 7 mph.
7-day forecast for Boneau
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 3 to 7 mph W | 1% |
| Tonight | 53°F | Mostly Clear | 3 to 7 mph SSW | 1% |
| Wednesday | 83°F | Mostly Sunny | 8 mph WSW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 3 to 8 mph SSE | 0% |
| Thursday | 90°F | Sunny | 5 to 9 mph WSW | 0% |
| Thursday Night | 58°F | Mostly Clear | 5 to 9 mph ENE | 0% |
| Friday | 93°F | Sunny | 2 to 10 mph SSW | 0% |
| Friday Night | 60°F | Mostly Clear | 8 mph E | 0% |
| Saturday | 90°F | Sunny | 7 mph WSW | 0% |
| Saturday Night | 60°F | Partly Cloudy | 8 mph ENE | 1% |
| Sunday | 86°F | Mostly Sunny | 5 to 8 mph NNE | 2% |
| Sunday Night | 59°F | Partly Cloudy | 8 mph NE | 8% |
| Monday | 84°F | Mostly Sunny | 5 to 8 mph NE | 12% |
| Monday Night | 58°F | Partly Cloudy then Slight Chance Rain Showers | 6 to 9 mph ENE | 19% |
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 Aug 4, 2026.