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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.

Overnight
57°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 3am, then patchy fog and showers and thunderstorms. Cloudy. Low around 57, with temperatures rising to around 59 overnight. North wind around 6 mph. Chance of precipitation is 80%.

7-day forecast for Custer

WhenTempForecastWindPrecip
Overnight 57°F Showers And Thunderstorms Likely 6 mph N 82%
Saturday 63°F Patchy Fog 7 to 12 mph NNE 98%
Saturday Night 52°F Patchy Fog 7 to 10 mph NNE 94%
Sunday 63°F Rain Showers 7 mph NNE 80%
Sunday Night 50°F Slight Chance Rain Showers then Areas Of Fog 0 to 5 mph E 18%
Monday 73°F Areas Of Fog then Mostly Sunny 0 to 3 mph SSE 0%
Monday Night 49°F Mostly Clear 2 mph ESE 0%
Tuesday 78°F Sunny 0 to 3 mph SW 0%
Tuesday Night 52°F Partly Cloudy then Slight Chance Rain Showers 1 mph E 15%
Wednesday 80°F Mostly Sunny 0 to 3 mph SW 6%
Wednesday Night 52°F Mostly Clear 1 mph SSE 5%
Thursday 82°F Sunny 1 to 5 mph SW 0%
Thursday Night 53°F Mostly Clear 2 mph SE 1%
Friday 82°F Mostly Sunny 1 to 5 mph SSW 0%

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.