Mount Vernon, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Grant County, Oregon.
Overnight
49°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 49, with temperatures rising to around 51 overnight. East wind around 2 mph.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Areas Of Smoke | 2 mph E | 0% |
| Tuesday | 90°F | Areas Of Smoke | 1 to 7 mph W | 0% |
| Tuesday Night | 54°F | Areas Of Smoke | 2 to 6 mph NE | 0% |
| Wednesday | 98°F | Areas Of Smoke | 2 to 7 mph N | 0% |
| Wednesday Night | 59°F | Areas Of Smoke then Mostly Clear | 1 to 7 mph NE | 0% |
| Thursday | 102°F | Sunny | 2 to 8 mph W | 0% |
| Thursday Night | 62°F | Mostly Clear | 2 to 8 mph W | 0% |
| Friday | 98°F | Sunny | 2 to 13 mph W | 0% |
| Friday Night | 60°F | Mostly Clear | 2 to 13 mph N | 0% |
| Saturday | 95°F | Sunny | 2 to 14 mph NW | 0% |
| Saturday Night | 58°F | Mostly Clear | 2 to 14 mph N | 0% |
| Sunday | 91°F | Sunny | 2 to 12 mph NW | 0% |
| Sunday Night | 55°F | Mostly Clear | 2 to 12 mph N | 0% |
| Monday | 90°F | Sunny | 1 to 12 mph N | 0% |
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 Aug 4, 2026.