Greenhorn, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenhorn, a city in Grant County, Oregon.
This Afternoon
41°F
Mostly Cloudy
Mostly cloudy. High near 41, with temperatures falling to around 37 in the afternoon. Southeast wind 2 to 7 mph.
7-day forecast for Greenhorn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 41°F | Mostly Cloudy | 2 to 7 mph SE | 3% |
| Tonight | 28°F | Mostly Cloudy | 1 to 5 mph W | 5% |
| Wednesday | 47°F | Sunny | 3 mph NW | 1% |
| Wednesday Night | 33°F | Mostly Cloudy then Chance Snow Showers | 3 mph W | 32% |
| Thursday | 40°F | Chance Snow Showers then Partly Sunny | 1 to 6 mph W | 32% |
| Thursday Night | 29°F | Partly Cloudy | 1 to 7 mph S | 6% |
| Friday | 44°F | Partly Sunny | 2 to 7 mph SE | 8% |
| Friday Night | 34°F | Partly Cloudy | 2 to 7 mph SE | 2% |
| Saturday | 48°F | Mostly Sunny | 9 mph SE | 1% |
| Saturday Night | 37°F | Mostly Cloudy | 7 to 14 mph SE | 2% |
| Sunday | 47°F | Partly Sunny | 1 to 10 mph SW | 11% |
| Sunday Night | 36°F | Mostly Cloudy | 1 to 7 mph E | 11% |
| Monday | 47°F | Partly Sunny | 1 to 7 mph SE | 11% |
| Monday Night | 36°F | Mostly Cloudy | 3 mph SW | 12% |
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 Nov 4, 2026.