Fallon, MT Weather & Growing Conditions
Overnight
57°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5am, then patchy fog and showers and thunderstorms likely. Cloudy, with a low around 57. East wind around 6 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Chance Showers And Thunderstorms | 6 mph E | 59% |
| Saturday | 64°F | Patchy Fog | 7 to 12 mph ENE | 84% |
| Saturday Night | 51°F | Rain Showers | 13 mph E | 87% |
| Sunday | 61°F | Rain Showers | 13 mph E | 90% |
| Sunday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 10 mph ESE | 19% |
| Monday | 69°F | Partly Sunny | 6 to 13 mph SE | 4% |
| Monday Night | 50°F | Mostly Clear | 14 mph SE | 0% |
| Tuesday | 77°F | Sunny | 13 mph SSE | 0% |
| Tuesday Night | 53°F | Mostly Clear | 6 to 14 mph SSE | 1% |
| Wednesday | 81°F | Mostly Sunny then Slight Chance Rain Showers | 7 mph SSE | 15% |
| Wednesday Night | 54°F | Mostly Clear | 3 to 7 mph SE | 12% |
| Thursday | 83°F | Mostly Sunny | 3 to 8 mph SSE | 3% |
| Thursday Night | 55°F | Mostly Clear | 6 to 9 mph SE | 4% |
| Friday | 82°F | Mostly Sunny | 8 to 14 mph SSE | 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 Sep 19, 2026.