Corvallis, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Corvallis, a community in Ravalli County, Montana.
This Afternoon
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 70. North northwest wind 5 to 8 mph. Chance of precipitation is 70%.
7-day forecast for Corvallis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Showers And Thunderstorms | 5 to 8 mph NNW | 72% |
| Tonight | 49°F | Showers And Thunderstorms | 1 to 5 mph SW | 90% |
| Saturday | 65°F | Rain Showers Likely | 0 to 3 mph NNW | 67% |
| Saturday Night | 45°F | Partly Cloudy | 3 mph SE | 5% |
| Sunday | 73°F | Sunny | 3 mph SSW | 0% |
| Sunday Night | 47°F | Mostly Clear | 5 mph E | 0% |
| Monday | 77°F | Sunny | 5 mph SSW | 0% |
| Monday Night | 48°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 76°F | Sunny | 3 mph SSW | 0% |
| Tuesday Night | 47°F | Mostly Clear | 5 mph W | 4% |
| Wednesday | 75°F | Sunny | 6 mph SSW | 2% |
| Wednesday Night | 47°F | Mostly Clear | 5 mph SSW | 2% |
| Thursday | 78°F | Sunny | 5 mph SSW | 1% |
| Thursday Night | 48°F | Partly Cloudy | 2 to 8 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Corvallis (46.314, -114.112). Updated through the day.
Growing snapshot for Corvallis
Last spring frost
May 23
First fall frost
Sep 21
Growing season
118 days
Hardiness zone
5b
More local growing data for Corvallis: nearby ZIP 59841 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Western Ag Rsch Ctr, Mt (6.6 mi from Corvallis). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.