Grass Valley, OR Weather & Growing Conditions
Today
78°F
Sunny
Sunny, with a high near 78. Northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 5 mph NE | 0% |
| Tonight | 53°F | Mostly Clear | 1 to 5 mph E | 0% |
| Sunday | 81°F | Sunny | 1 to 7 mph SE | 0% |
| Sunday Night | 55°F | Mostly Clear | 1 to 7 mph E | 0% |
| Monday | 81°F | Sunny | 2 to 8 mph W | 0% |
| Monday Night | 52°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Tuesday | 73°F | Mostly Sunny | 5 to 14 mph W | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 14 mph W | 0% |
| Wednesday | 69°F | Mostly Sunny | 5 to 12 mph W | 0% |
| Wednesday Night | 47°F | Partly Cloudy | 2 to 12 mph W | 0% |
| Thursday | 66°F | Mostly Sunny | 2 to 8 mph N | 4% |
| Thursday Night | 47°F | Mostly Cloudy | 2 to 8 mph NW | 7% |
| Friday | 63°F | Partly Sunny | 2 to 13 mph NW | 7% |
| Friday Night | 44°F | Partly Cloudy | 3 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.