Mount Vernon, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Grant County, Oregon.
Tonight
49°F
Mostly Clear
Mostly clear, with a low around 49. Northeast wind around 2 mph.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Mostly Clear | 2 mph NE | 0% |
| Saturday | 79°F | Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 51°F | Partly Cloudy | 0 to 6 mph NE | 0% |
| Sunday | 84°F | Sunny | 1 to 6 mph E | 0% |
| Sunday Night | 52°F | Mostly Clear | 0 to 8 mph NE | 0% |
| Monday | 85°F | Sunny | 1 to 7 mph NE | 0% |
| Monday Night | 54°F | Partly Cloudy | 0 to 3 mph NE | 0% |
| Tuesday | 84°F | Sunny | 0 to 6 mph NW | 0% |
| Tuesday Night | 52°F | Mostly Clear | 2 to 6 mph NE | 0% |
| Wednesday | 82°F | Sunny | 2 to 6 mph SW | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 6 mph N | 1% |
| Thursday | 82°F | Mostly Sunny | 2 to 7 mph SW | 1% |
| Thursday Night | 51°F | Partly Cloudy | 3 to 7 mph NE | 4% |
| Friday | 76°F | Mostly Sunny | 3 to 9 mph NW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Mount Vernon (44.417, -119.113). Updated through the day.
Growing snapshot for Mount Vernon
Last spring frost
May 28
First fall frost
Sep 18
Growing season
113 days
Hardiness zone
6b
More local growing data for Mount Vernon: nearby ZIP 97865 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, John Day, Or (11.2 mi from Mount Vernon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.