Grass Valley, OR Weather & Growing Conditions
Overnight
52°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 52, with temperatures rising to around 54 overnight. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Areas Of Smoke | 3 mph SE | 0% |
| Tuesday | 84°F | Areas Of Smoke | 2 to 15 mph E | 0% |
| Tuesday Night | 56°F | Areas Of Smoke | 1 to 12 mph SE | 0% |
| Wednesday | 92°F | Areas Of Smoke | 1 to 8 mph E | 0% |
| Wednesday Night | 60°F | Patchy Smoke then Mostly Clear | 3 to 8 mph NW | 0% |
| Thursday | 96°F | Sunny | 3 to 12 mph W | 0% |
| Thursday Night | 62°F | Mostly Clear | 7 to 12 mph W | 0% |
| Friday | 92°F | Sunny | 7 to 18 mph W | 0% |
| Friday Night | 59°F | Mostly Clear | 5 to 18 mph W | 0% |
| Saturday | 88°F | Sunny | 5 to 21 mph W | 0% |
| Saturday Night | 56°F | Mostly Clear | 7 to 21 mph W | 0% |
| Sunday | 81°F | Sunny | 7 to 18 mph W | 0% |
| Sunday Night | 52°F | Mostly Clear | 5 to 18 mph W | 0% |
| Monday | 81°F | Sunny | 5 to 16 mph W | 0% |
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 Aug 4, 2026.