Mount Vernon, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Grant County, Oregon.
This Afternoon
57°F
Cloudy
Cloudy. High near 57, with temperatures falling to around 50 in the afternoon. Southeast wind around 5 mph.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Cloudy | 5 mph SE | 1% |
| Tonight | 33°F | Partly Cloudy | 1 to 6 mph SE | 1% |
| Wednesday | 57°F | Sunny | 2 mph SW | 0% |
| Wednesday Night | 38°F | Slight Chance Rain Showers | 2 mph S | 23% |
| Thursday | 54°F | Mostly Sunny | 2 mph W | 11% |
| Thursday Night | 34°F | Partly Cloudy | 0 to 9 mph E | 5% |
| Friday | 59°F | Partly Sunny | 0 to 9 mph SE | 5% |
| Friday Night | 38°F | Partly Cloudy | 0 to 9 mph E | 1% |
| Saturday | 66°F | Mostly Sunny | 7 to 12 mph SE | 0% |
| Saturday Night | 41°F | Mostly Cloudy | 7 to 21 mph SE | 2% |
| Sunday | 61°F | Partly Sunny | 1 to 15 mph SW | 9% |
| Sunday Night | 39°F | Mostly Cloudy | 1 to 7 mph S | 9% |
| Monday | 61°F | Partly Sunny | 1 to 7 mph S | 9% |
| Monday Night | 40°F | Mostly Cloudy | 1 to 7 mph S | 11% |
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.