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Custer, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Custer, a community in Yellowstone County, Montana.

Tonight
57°F
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
A chance of showers and thunderstorms before midnight, then showers and thunderstorms likely between midnight and 3am, then patchy fog and showers and thunderstorms. Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. North wind around 6 mph. Chance of precipitation is 100%.

7-day forecast for Custer

WhenTempForecastWindPrecip
Tonight 57°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 6 mph N 96%
Saturday 63°F Showers And Thunderstorms 6 to 12 mph NNE 96%
Saturday Night 54°F Showers And Thunderstorms 9 mph NE 94%
Sunday 64°F Rain Showers 7 mph NNE 86%
Sunday Night 50°F Slight Chance Rain Showers then Mostly Cloudy 0 to 5 mph NNE 20%
Monday 73°F Partly Sunny 0 to 3 mph SSE 0%
Monday Night 49°F Mostly Clear 2 mph E 0%
Tuesday 79°F Mostly Sunny 0 to 3 mph WSW 0%
Tuesday Night 52°F Partly Cloudy 1 mph E 5%
Wednesday 80°F Mostly Sunny 0 to 3 mph WSW 4%
Wednesday Night 51°F Mostly Clear 1 mph ENE 3%
Thursday 81°F Sunny 3 mph S 1%
Thursday Night 52°F Mostly Clear 2 mph ESE 1%
Friday 81°F Mostly Sunny 3 mph S 3%

Forecast source: National Weather Service (api.weather.gov) for Custer (46.129, -107.556). Updated through the day.

Growing snapshot for Custer

Last spring frost
May 22
First fall frost
Sep 22
Growing season
121 days
Hardiness zone
4b

More local growing data for Custer: nearby ZIP 59024 weather · frost dates · planting calendar · Montana frost dates

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Climate data from the nearest NOAA station, Pompeys Pillar 15N, Mt (11 mi from Custer). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.