Fairfield, MT Weather & Growing Conditions
This Afternoon
51°F
Mostly Sunny
Mostly sunny. High near 51, with temperatures falling to around 45 in the afternoon. South wind 3 to 12 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Mostly Sunny | 3 to 12 mph S | 0% |
| Tonight | 30°F | Mostly Cloudy | 6 mph WSW | 0% |
| Wednesday | 48°F | Mostly Sunny | 3 mph NNE | 0% |
| Wednesday Night | 30°F | Mostly Clear | 2 to 10 mph SSW | 0% |
| Thursday | 52°F | Mostly Sunny | 12 mph SW | 0% |
| Thursday Night | 33°F | Partly Cloudy | 9 to 14 mph SW | 1% |
| Friday | 50°F | Mostly Sunny | 13 to 18 mph SW | 2% |
| Friday Night | 36°F | Mostly Cloudy | 13 to 20 mph SW | 2% |
| Saturday | 53°F | Mostly Sunny | 6 to 16 mph SW | 0% |
| Saturday Night | 38°F | Mostly Cloudy | 6 to 15 mph SSW | 0% |
| Sunday | 59°F | Partly Sunny | 12 to 18 mph SW | 1% |
| Sunday Night | 37°F | Mostly Cloudy | 7 to 12 mph SW | 1% |
| Monday | 53°F | Partly Sunny | 7 mph SW | 1% |
| Monday Night | 38°F | Mostly Cloudy | 6 to 12 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fairfield, MT
Last spring frost
May 13
First fall frost
Sep 27
Growing season
135 days
Hardiness zone
4b
Explore more for Fairfield, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Fairfield, Mt (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.