Grass Valley, OR Weather & Growing Conditions
Overnight
50°F
Mostly Clear
Mostly clear. Low around 50, with temperatures rising to around 52 overnight. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Clear | 6 mph SW | 0% |
| Saturday | 77°F | Sunny | 2 to 7 mph SE | 0% |
| Saturday Night | 53°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Sunday | 79°F | Sunny | 3 to 8 mph E | 0% |
| Sunday Night | 54°F | Mostly Clear | 1 to 8 mph E | 0% |
| Monday | 79°F | Sunny | 2 to 8 mph W | 0% |
| Monday Night | 54°F | Partly Cloudy | 3 to 8 mph W | 0% |
| Tuesday | 75°F | Sunny | 5 to 10 mph W | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 10 mph W | 0% |
| Wednesday | 71°F | Mostly Sunny | 5 to 9 mph W | 2% |
| Wednesday Night | 49°F | Partly Cloudy | 3 to 9 mph W | 2% |
| Thursday | 68°F | Mostly Sunny | 3 to 8 mph NW | 1% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 8 mph W | 7% |
| Friday | 64°F | Mostly Sunny | 5 to 13 mph W | 8% |
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 (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.