Corvallis, MT Weather & Growing Conditions
Overnight
42°F
Partly Cloudy
Partly cloudy, with a low around 42. East southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Partly Cloudy | 3 mph ESE | 1% |
| Sunday | 60°F | Sunny | 3 mph SW | 1% |
| Sunday Night | 45°F | Mostly Clear | 1 to 5 mph ESE | 0% |
| Monday | 63°F | Sunny | 5 mph SSW | 0% |
| Monday Night | 48°F | Mostly Clear | 3 mph S | 0% |
| Tuesday | 63°F | Mostly Sunny | 3 mph SW | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 mph SSE | 2% |
| Wednesday | 63°F | Mostly Sunny | 5 mph SSW | 3% |
| Wednesday Night | 47°F | Partly Cloudy | 5 mph SSW | 7% |
| Thursday | 63°F | Mostly Sunny | 5 mph SW | 3% |
| Thursday Night | 48°F | Partly Cloudy | 5 mph ESE | 6% |
| Friday | 61°F | Mostly Sunny | 6 mph SSW | 7% |
| Friday Night | 43°F | Mostly Cloudy then Slight Chance Light Rain | 5 mph NNW | 16% |
| Saturday | 53°F | Slight Chance Light Rain then Partly Sunny | 3 mph WSW | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Corvallis, MT
Last spring frost
May 23
First fall frost
Sep 21
Growing season
118 days
Hardiness zone
5b
Explore more for Corvallis, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Western Ag Rsch Ctr, Mt (6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.