Grass Valley, OR Weather & Growing Conditions
This Afternoon
50°F
Mostly Cloudy
Mostly cloudy. High near 50, with temperatures falling to around 43 in the afternoon. Northeast wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Mostly Cloudy | 8 mph NE | 2% |
| Tonight | 33°F | Partly Cloudy | 1 to 5 mph S | 2% |
| Wednesday | 53°F | Mostly Sunny | 2 to 6 mph SW | 10% |
| Wednesday Night | 40°F | Rain Showers Likely | 3 to 9 mph SW | 63% |
| Thursday | 54°F | Mostly Sunny | 3 to 10 mph SW | 1% |
| Thursday Night | 38°F | Mostly Cloudy | 5 mph SW | 4% |
| Friday | 55°F | Mostly Cloudy | 3 to 7 mph SW | 4% |
| Friday Night | 39°F | Mostly Cloudy | 3 mph SW | 3% |
| Saturday | 58°F | Partly Sunny | 5 mph SE | 1% |
| Saturday Night | 41°F | Mostly Cloudy then Slight Chance Rain Showers | 2 to 9 mph SW | 16% |
| Sunday | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 12 mph SW | 16% |
| Sunday Night | 39°F | Mostly Cloudy | 1 to 5 mph SW | 9% |
| Monday | 53°F | Mostly Cloudy | 3 mph S | 9% |
| Monday Night | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 1 to 5 mph W | 17% |
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 Nov 4, 2026.