Greenhorn, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenhorn, a city in Grant County, Oregon.
Overnight
39°F
Mostly Clear
Mostly clear, with a low around 39. Northwest wind around 5 mph.
7-day forecast for Greenhorn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Mostly Clear | 5 mph NW | 3% |
| Saturday | 64°F | Sunny | 2 to 6 mph NW | 1% |
| Saturday Night | 45°F | Partly Cloudy | 5 mph S | 1% |
| Sunday | 68°F | Sunny | 5 mph S | 0% |
| Sunday Night | 47°F | Mostly Clear | 2 to 6 mph SE | 0% |
| Monday | 68°F | Sunny | 2 to 6 mph S | 1% |
| Monday Night | 47°F | Partly Cloudy | 3 mph W | 1% |
| Tuesday | 68°F | Sunny | 6 mph SW | 1% |
| Tuesday Night | 49°F | Mostly Clear | 3 mph N | 1% |
| Wednesday | 68°F | Sunny | 1 to 6 mph S | 2% |
| Wednesday Night | 48°F | Partly Cloudy | 3 mph N | 2% |
| Thursday | 68°F | Mostly Sunny | 5 mph SE | 1% |
| Thursday Night | 48°F | Partly Cloudy | 5 mph NE | 3% |
| Friday | 62°F | Mostly Sunny | 3 to 7 mph W | 8% |
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 Sep 19, 2026.