Grass Valley, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grass Valley, a city in Sherman County, Oregon.
Overnight
53°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 53, with temperatures rising to around 55 overnight. Southeast wind around 3 mph.
7-day forecast for Grass Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Areas Of Smoke | 3 mph SE | 0% |
| Tuesday | 84°F | Areas Of Smoke | 2 to 15 mph E | 0% |
| Tuesday Night | 57°F | Areas Of Smoke | 1 to 12 mph E | 0% |
| Wednesday | 91°F | Areas Of Smoke | 1 to 8 mph E | 0% |
| Wednesday Night | 61°F | Patchy Smoke then Mostly Clear | 2 to 8 mph W | 0% |
| Thursday | 96°F | Sunny | 5 to 13 mph W | 0% |
| Thursday Night | 62°F | Mostly Clear | 6 to 13 mph W | 0% |
| Friday | 91°F | Sunny | 6 to 18 mph W | 0% |
| Friday Night | 60°F | Mostly Clear | 5 to 18 mph W | 0% |
| Saturday | 87°F | Sunny | 5 to 21 mph W | 0% |
| Saturday Night | 56°F | Mostly Clear | 6 to 21 mph W | 0% |
| Sunday | 79°F | Sunny | 6 to 18 mph W | 0% |
| Sunday Night | 53°F | Mostly Clear | 5 to 18 mph W | 0% |
| Monday | 79°F | Sunny | 5 to 16 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Grass Valley (45.359, -120.784). Updated through the day.
Growing snapshot for Grass Valley
Last spring frost
May 15
First fall frost
Oct 11
Growing season
147 days
Hardiness zone
7a
More local growing data for Grass Valley: nearby ZIP 97029 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Kent, Or (9.1 mi from Grass Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.