Belknap, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belknap, a community in Sanders County, Montana.
Tonight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. North northwest wind around 2 mph.
7-day forecast for Belknap
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Cloudy | 2 mph NNW | 2% |
| Saturday | 79°F | Sunny | 1 mph N | 5% |
| Saturday Night | 50°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 80°F | Sunny | 2 mph NW | 0% |
| Sunday Night | 52°F | Clear | 1 mph NNW | 0% |
| Monday | 81°F | Sunny | 0 to 3 mph NW | 1% |
| Monday Night | 52°F | Mostly Clear | 0 to 3 mph W | 0% |
| Tuesday | 79°F | Sunny | 2 mph WSW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 2 mph W | 1% |
| Wednesday | 76°F | Sunny | 0 to 3 mph SW | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 2 mph W | 2% |
| Thursday | 80°F | Mostly Sunny | 1 mph SSW | 2% |
| Thursday Night | 52°F | Partly Cloudy | 1 mph S | 2% |
| Friday | 76°F | Mostly Sunny | 0 to 3 mph SSW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Belknap (47.647, -115.422). Updated through the day.
Growing snapshot for Belknap
Last spring frost
May 7
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
6a
More local growing data for Belknap: nearby ZIP 59873 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Bull Lake
Camas
Dixon
Heron
Hot Springs
Lonepine
Noxon
Old Agency
Paradise
Plains
Thompson Falls
Trout Creek
Climate data from the nearest NOAA station, Thompson Falls Ph, Mt (6.3 mi from Belknap). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.