Harman US

Grass Valley, OR Weather & Growing Conditions

Today
78°F
Sunny
Sunny, with a high near 78. Northeast wind around 5 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 78°F Sunny 5 mph NE 0%
Tonight 53°F Mostly Clear 1 to 5 mph E 0%
Sunday 81°F Sunny 1 to 7 mph SE 0%
Sunday Night 55°F Mostly Clear 1 to 7 mph E 0%
Monday 81°F Sunny 2 to 8 mph W 0%
Monday Night 52°F Partly Cloudy 5 to 8 mph W 0%
Tuesday 73°F Mostly Sunny 5 to 14 mph W 0%
Tuesday Night 47°F Partly Cloudy 5 to 14 mph W 0%
Wednesday 69°F Mostly Sunny 5 to 12 mph W 0%
Wednesday Night 47°F Partly Cloudy 2 to 12 mph W 0%
Thursday 66°F Mostly Sunny 2 to 8 mph N 4%
Thursday Night 47°F Mostly Cloudy 2 to 8 mph NW 7%
Friday 63°F Partly Sunny 2 to 13 mph NW 7%
Friday Night 44°F Partly Cloudy 3 to 13 mph W 7%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Grass Valley, OR

Last spring frost
May 15
First fall frost
Oct 11
Growing season
147 days
Hardiness zone
7a

Explore more for Grass Valley, OR: full frost dates · planting calendar · Oregon frost dates

Climate data from the nearest NOAA station, Kent, Or (9.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.