Fallon, MT Weather & Growing Conditions
Tonight
27°F
Mostly Clear
Mostly clear, with a low around 27. South southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 27°F | Mostly Clear | 2 mph SSW | 0% |
| Wednesday | 52°F | Mostly Sunny | 0 to 6 mph WNW | 0% |
| Wednesday Night | 29°F | Mostly Cloudy | 2 mph WSW | 0% |
| Thursday | 55°F | Mostly Sunny | 1 to 6 mph S | 0% |
| Thursday Night | 32°F | Partly Cloudy | 3 mph SSW | 0% |
| Friday | 54°F | Sunny | 2 to 10 mph WSW | 1% |
| Friday Night | 35°F | Partly Cloudy | 8 mph WSW | 3% |
| Saturday | 57°F | Sunny | 6 to 14 mph W | 3% |
| Saturday Night | 33°F | Mostly Clear | 6 mph SW | 0% |
| Sunday | 62°F | Mostly Sunny | 5 to 10 mph SW | 0% |
| Sunday Night | 39°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Monday | 57°F | Mostly Sunny | 5 to 8 mph W | 0% |
| Monday Night | 35°F | Partly Cloudy | 5 mph SSW | 1% |
| Tuesday | 60°F | Mostly Sunny | 3 to 8 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fallon, MT
Last spring frost
May 20
First fall frost
Sep 22
Growing season
124 days
Hardiness zone
4a
Explore more for Fallon, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Mildred 5 N, Mt (4.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.