Darby, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Darby, a town in Ravalli County, Montana.
Tonight
31°F
Mostly Cloudy
Mostly cloudy, with a low around 31. South southeast wind around 2 mph.
7-day forecast for Darby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Mostly Cloudy | 2 mph SSE | 0% |
| Wednesday | 51°F | Mostly Sunny | 3 mph NNE | 0% |
| Wednesday Night | 30°F | Mostly Clear | 2 to 6 mph SW | 1% |
| Thursday | 47°F | Partly Sunny | 2 to 6 mph SW | 9% |
| Thursday Night | 29°F | Partly Cloudy | 6 mph SW | 3% |
| Friday | 52°F | Mostly Sunny | 6 mph SSW | 4% |
| Friday Night | 35°F | Mostly Cloudy | 6 to 9 mph SSW | 4% |
| Saturday | 59°F | Mostly Sunny | 7 mph S | 1% |
| Saturday Night | 37°F | Partly Cloudy | 6 to 15 mph S | 9% |
| Sunday | 60°F | Mostly Sunny | 7 to 12 mph SSW | 9% |
| Sunday Night | 36°F | Mostly Cloudy | 7 mph SW | 8% |
| Monday | 57°F | Partly Sunny | 5 mph S | 9% |
| Monday Night | 37°F | Mostly Cloudy | 3 to 9 mph SSW | 11% |
| Tuesday | 58°F | Mostly Sunny | 6 mph SSW | 13% |
Forecast source: National Weather Service (api.weather.gov) for Darby (46.025, -114.180). Updated through the day.
Growing snapshot for Darby
Last spring frost
May 21
First fall frost
Sep 22
Growing season
122 days
Hardiness zone
5b
More local growing data for Darby: nearby ZIP 59840 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hamilton, Mt (6.3 mi from Darby). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.