Custer, MT Weather & Growing Conditions
Overnight
30°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 30. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 30°F | Patchy Fog | 0 mph | 0% |
| Wednesday | 51°F | Patchy Fog then Sunny | 0 to 5 mph NW | 0% |
| Wednesday Night | 30°F | Patchy Fog | 0 to 3 mph WNW | 0% |
| Thursday | 57°F | Patchy Fog then Mostly Sunny | 1 to 9 mph WSW | 0% |
| Thursday Night | 35°F | Mostly Cloudy | 2 mph WNW | 6% |
| Friday | 55°F | Sunny | 2 to 13 mph WSW | 0% |
| Friday Night | 38°F | Partly Cloudy | 6 to 12 mph WSW | 0% |
| Saturday | 60°F | Sunny | 3 to 12 mph WSW | 0% |
| Saturday Night | 36°F | Mostly Clear | 1 to 6 mph SSW | 0% |
| Sunday | 66°F | Mostly Sunny | 6 to 13 mph WSW | 0% |
| Sunday Night | 39°F | Partly Cloudy | 1 to 6 mph NW | 1% |
| Monday | 57°F | Mostly Sunny | 1 to 5 mph W | 1% |
| Monday Night | 36°F | Partly Cloudy | 0 to 3 mph S | 1% |
| Tuesday | 61°F | Mostly Sunny | 2 to 8 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Custer, MT
Last spring frost
May 22
First fall frost
Sep 22
Growing season
121 days
Hardiness zone
4b
Explore more for Custer, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Pompeys Pillar 15N, Mt (11 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.