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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
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.