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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.