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
33°F
Mostly Clear
Mostly clear, with a low around 33. East wind around 1 mph.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 33°F | Mostly Clear | 1 mph E | 0% |
| Wednesday | 57°F | Sunny | 1 mph SW | 2% |
| Wednesday Night | 38°F | Mostly Cloudy then Slight Chance Rain Showers | 2 mph S | 20% |
| Thursday | 53°F | Slight Chance Rain Showers then Mostly Sunny | 2 mph NW | 20% |
| Thursday Night | 32°F | Mostly Clear | 0 to 9 mph E | 0% |
| Friday | 60°F | Partly Sunny | 0 to 9 mph SE | 0% |
| Friday Night | 36°F | Partly Cloudy | 0 to 10 mph E | 0% |
| Saturday | 66°F | Mostly Sunny | 7 to 10 mph SE | 0% |
| Saturday Night | 39°F | Mostly Cloudy | 7 to 21 mph SE | 3% |
| Sunday | 58°F | Partly Sunny | 0 to 10 mph SW | 4% |
| Sunday Night | 37°F | Mostly Cloudy | 0 to 7 mph E | 1% |
| Monday | 60°F | Partly Sunny | 0 to 7 mph SE | 4% |
| Monday Night | 38°F | Mostly Cloudy | 0 to 7 mph SE | 13% |
| Tuesday | 59°F | Slight Chance Rain Showers | 2 to 7 mph SE | 15% |
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 Nov 4, 2026.