Grass Valley, OR Weather & Growing Conditions
Tonight
34°F
Partly Cloudy
Partly cloudy. Low around 34, with temperatures rising to around 36 overnight. Southwest wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Partly Cloudy | 2 to 6 mph SW | 1% |
| Wednesday | 52°F | Sunny | 2 to 7 mph SW | 11% |
| Wednesday Night | 43°F | Chance Rain Showers | 3 to 12 mph SW | 54% |
| Thursday | 53°F | Mostly Sunny | 3 to 12 mph SW | 1% |
| Thursday Night | 40°F | Partly Cloudy | 2 to 7 mph SW | 4% |
| Friday | 56°F | Mostly Cloudy | 3 to 7 mph SW | 4% |
| Friday Night | 41°F | Mostly Cloudy | 5 mph SW | 3% |
| Saturday | 58°F | Partly Sunny | 5 mph SE | 1% |
| Saturday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 2 to 14 mph S | 19% |
| Sunday | 55°F | Slight Chance Rain Showers | 5 to 14 mph SW | 19% |
| Sunday Night | 40°F | Mostly Cloudy | 1 to 5 mph SE | 7% |
| Monday | 53°F | Mostly Cloudy | 3 mph S | 7% |
| Monday Night | 41°F | Mostly Cloudy | 2 to 7 mph S | 12% |
| Tuesday | 58°F | Chance Rain Showers | 5 to 8 mph SW | 25% |
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 Nov 4, 2026.