Harman US

Grass Valley, OR Weather & Growing Conditions

Overnight
49°F
Mostly Clear
Mostly clear. Low around 49, with temperatures rising to around 51 overnight. South wind around 3 mph.

7-day forecast

WhenTempForecastWindPrecip
Overnight 49°F Mostly Clear 3 mph S 0%
Saturday 77°F Sunny 5 mph SW 0%
Saturday Night 52°F Partly Cloudy 1 to 5 mph NE 0%
Sunday 79°F Sunny 1 to 7 mph E 0%
Sunday Night 53°F Mostly Clear 1 to 7 mph NW 0%
Monday 79°F Sunny 1 to 9 mph NW 0%
Monday Night 51°F Partly Cloudy 3 to 9 mph W 0%
Tuesday 74°F Sunny 3 to 12 mph W 0%
Tuesday Night 48°F Partly Cloudy 5 to 12 mph W 0%
Wednesday 70°F Mostly Sunny 5 to 9 mph W 1%
Wednesday Night 48°F Partly Cloudy 2 to 9 mph W 1%
Thursday 68°F Mostly Sunny 2 to 8 mph NW 2%
Thursday Night 47°F Partly Cloudy 2 to 8 mph NW 6%
Friday 64°F Mostly Sunny 2 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.