Darby, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Darby, a town in Ravalli County, Montana.
This Afternoon
70°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a high near 70. North northwest wind around 7 mph. Chance of precipitation is 80%.
7-day forecast for Darby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms | 7 mph NNW | 81% |
| Tonight | 51°F | Showers And Thunderstorms | 6 mph WSW | 96% |
| Saturday | 65°F | Rain Showers | 6 mph NNW | 77% |
| Saturday Night | 45°F | Partly Cloudy | 3 mph SSW | 8% |
| Sunday | 75°F | Sunny | 5 mph E | 0% |
| Sunday Night | 48°F | Mostly Clear | 5 mph S | 0% |
| Monday | 79°F | Sunny | 6 mph SW | 0% |
| Monday Night | 49°F | Mostly Clear | 5 mph WSW | 0% |
| Tuesday | 78°F | Sunny | 2 to 6 mph SSW | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 6 mph WSW | 3% |
| Wednesday | 78°F | Sunny | 3 to 7 mph SSW | 2% |
| Wednesday Night | 49°F | Mostly Clear | 6 mph SW | 1% |
| Thursday | 81°F | Sunny | 7 mph S | 1% |
| Thursday Night | 50°F | Partly Cloudy | 5 to 10 mph WSW | 1% |
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 Sep 19, 2026.