Fallon, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fallon, a community in Prairie County, Montana.
This Afternoon
51°F
Sunny
Sunny. High near 51, with temperatures falling to around 45 in the afternoon. West southwest wind around 5 mph.
7-day forecast for Fallon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Sunny | 5 mph WSW | 0% |
| Tonight | 27°F | Mostly Clear | 1 mph SW | 0% |
| Wednesday | 53°F | Mostly Sunny | 1 to 5 mph WNW | 0% |
| Wednesday Night | 28°F | Partly Cloudy | 1 to 5 mph WNW | 0% |
| Thursday | 53°F | Mostly Sunny | 3 mph SW | 0% |
| Thursday Night | 30°F | Partly Cloudy | 3 mph WSW | 0% |
| Friday | 56°F | Mostly Sunny | 3 to 8 mph WSW | 1% |
| Friday Night | 34°F | Partly Cloudy | 5 to 9 mph WSW | 5% |
| Saturday | 54°F | Sunny | 8 to 18 mph W | 5% |
| Saturday Night | 29°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Sunday | 59°F | Sunny | 3 to 8 mph SW | 0% |
| Sunday Night | 35°F | Partly Cloudy | 7 mph WSW | 0% |
| Monday | 59°F | Mostly Sunny | 3 to 7 mph WNW | 0% |
| Monday Night | 34°F | Mostly Cloudy | 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Fallon (46.837, -105.127). Updated through the day.
Growing snapshot for Fallon
Last spring frost
May 20
First fall frost
Sep 22
Growing season
124 days
Hardiness zone
4a
More local growing data for Fallon: nearby ZIP 59326 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mildred 5 N, Mt (4.9 mi from Fallon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.