Fairfield, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfield, a town in Cascade County, Montana.
This Afternoon
71°F
Partly Sunny
Partly sunny, with a high near 71. North northeast wind around 10 mph.
7-day forecast for Fairfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Partly Sunny | 10 mph NNE | 3% |
| Tonight | 50°F | Cloudy then Slight Chance Light Rain | 9 mph N | 23% |
| Saturday | 65°F | Slight Chance Light Rain then Mostly Cloudy | 8 mph NE | 18% |
| Saturday Night | 47°F | Mostly Cloudy | 3 to 7 mph SSE | 2% |
| Sunday | 72°F | Sunny | 3 to 7 mph S | 1% |
| Sunday Night | 47°F | Mostly Clear | 2 to 8 mph S | 0% |
| Monday | 77°F | Sunny | 5 to 8 mph SSW | 0% |
| Monday Night | 49°F | Mostly Clear | 6 mph SW | 0% |
| Tuesday | 75°F | Sunny | 7 mph WSW | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 to 7 mph S | 0% |
| Wednesday | 76°F | Sunny | 5 to 8 mph SW | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 3 to 8 mph WSW | 2% |
| Thursday | 77°F | Sunny | 5 to 9 mph SSW | 1% |
| Thursday Night | 50°F | Partly Cloudy | 5 to 8 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for Fairfield (47.615, -111.981). Updated through the day.
Growing snapshot for Fairfield
Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4b
More local growing data for Fairfield: nearby ZIP 59443 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
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Stockett
Sun Prairie
Sun River
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Ulm
Vaughn
Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (7.4 mi from Fairfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.