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Culbertson, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Culbertson, a town in Roosevelt County, Montana.

Tonight
55°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 55. Northeast wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

7-day forecast for Culbertson

WhenTempForecastWindPrecip
Tonight 55°F Chance Showers And Thunderstorms 6 to 10 mph NE 28%
Saturday 68°F Chance Rain Showers 9 to 14 mph ENE 29%
Saturday Night 50°F Chance Rain Showers 12 mph E 44%
Sunday 63°F Rain Showers Likely 13 mph ESE 56%
Sunday Night 47°F Mostly Cloudy 7 to 10 mph ESE 3%
Monday 71°F Mostly Sunny 6 to 15 mph SE 1%
Monday Night 50°F Partly Cloudy 12 to 15 mph SE 0%
Tuesday 77°F Mostly Sunny 12 to 15 mph SSE 0%
Tuesday Night 52°F Partly Cloudy 8 to 14 mph SE 4%
Wednesday 80°F Sunny 8 mph SSE 7%
Wednesday Night 53°F Mostly Clear 6 mph SSE 7%
Thursday 81°F Sunny 3 to 8 mph SE 2%
Thursday Night 54°F Mostly Clear 8 mph SE 2%
Friday 80°F Mostly Sunny 8 to 14 mph SE 3%

Forecast source: National Weather Service (api.weather.gov) for Culbertson (48.145, -104.518). Updated through the day.

Growing snapshot for Culbertson

Last spring frost
May 21
First fall frost
Sep 20
Growing season
120 days
Hardiness zone
4a

More local growing data for Culbertson: nearby ZIP 59218 weather · frost dates · planting calendar · Montana frost dates

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Climate data from the nearest NOAA station, Culbertson, Mt (5.2 mi from Culbertson). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.