Greenhorn, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenhorn, a city in Grant County, Oregon.
Overnight
45°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 45. North wind around 2 mph.
7-day forecast for Greenhorn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Areas Of Smoke | 2 mph N | 0% |
| Tuesday | 76°F | Areas Of Smoke | 3 mph NW | 0% |
| Tuesday Night | 50°F | Smoke | 3 mph NW | 0% |
| Wednesday | 83°F | Areas Of Smoke | 1 to 6 mph SW | 0% |
| Wednesday Night | 58°F | Smoke | 1 to 5 mph W | 0% |
| Thursday | 88°F | Patchy Smoke | 1 to 9 mph SW | 0% |
| Thursday Night | 60°F | Patchy Smoke | 5 mph W | 0% |
| Friday | 85°F | Sunny | 2 to 7 mph NW | 0% |
| Friday Night | 58°F | Mostly Clear | 1 to 7 mph NW | 0% |
| Saturday | 82°F | Sunny | 1 to 7 mph NW | 0% |
| Saturday Night | 56°F | Mostly Clear | 2 to 7 mph NW | 0% |
| Sunday | 77°F | Sunny | 2 to 7 mph W | 0% |
| Sunday Night | 52°F | Mostly Clear | 2 to 7 mph NW | 0% |
| Monday | 76°F | Sunny | 2 to 7 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Greenhorn (44.709, -118.497). Updated through the day.
Growing snapshot for Greenhorn
Growing season
74 days
Hardiness zone
6b
More local growing data for Greenhorn: nearby ZIP 97877 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Austin 3 S, Or (17 mi from Greenhorn). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.