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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Acton
Ballantine
Billings
Broadview
Huntley
Laurel
Lockwood
Mountain View Colony
Nibbe
Shepherd
Worden
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.