Thompson Falls, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thompson Falls, a city in Sanders County, Montana.
This Afternoon
52°F
Partly Sunny
Partly sunny. High near 52, with temperatures falling to around 47 in the afternoon. East wind around 1 mph.
7-day forecast for Thompson Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Partly Sunny | 1 mph E | 1% |
| Tonight | 27°F | Mostly Cloudy then Patchy Fog | 0 mph | 2% |
| Wednesday | 55°F | Patchy Fog then Sunny | 2 mph SE | 0% |
| Wednesday Night | 27°F | Partly Cloudy then Areas Of Fog | 1 mph SSE | 12% |
| Thursday | 48°F | Chance Light Rain | 0 to 5 mph SW | 40% |
| Thursday Night | 30°F | Mostly Cloudy | 3 mph SSW | 11% |
| Friday | 51°F | Slight Chance Light Rain | 2 to 6 mph SSW | 24% |
| Friday Night | 33°F | Slight Chance Light Rain then Mostly Cloudy | 1 to 9 mph SSW | 24% |
| Saturday | 56°F | Partly Sunny | 2 mph S | 4% |
| Saturday Night | 33°F | Mostly Cloudy then Slight Chance Light Rain | 3 mph SSE | 19% |
| Sunday | 59°F | Chance Light Rain | 2 to 6 mph SSW | 43% |
| Sunday Night | 33°F | Slight Chance Light Rain | 0 to 3 mph SW | 23% |
| Monday | 55°F | Slight Chance Light Rain | 2 mph S | 23% |
| Monday Night | 33°F | Chance Light Rain | 2 mph S | 30% |
Forecast source: National Weather Service (api.weather.gov) for Thompson Falls (47.599, -115.343). Updated through the day.
Growing snapshot for Thompson Falls
Last spring frost
May 7
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
6a
More local growing data for Thompson Falls: nearby ZIP 59873 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Belknap
Bull Lake
Camas
Dixon
Heron
Hot Springs
Lonepine
Noxon
Old Agency
Paradise
Plains
Trout Creek
Climate data from the nearest NOAA station, Thompson Falls Ph, Mt (6.3 mi from Thompson Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.