Harper, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harper, a community in Malheur County, Oregon.
Today
62°F
Sunny
Sunny. High near 62, with temperatures falling to around 58 in the afternoon. South southeast wind around 5 mph.
7-day forecast for Harper
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Sunny | 5 mph SSE | 0% |
| Tonight | 38°F | Mostly Cloudy | 1 to 5 mph S | 1% |
| Thursday | 59°F | Mostly Sunny | 5 mph WNW | 1% |
| Thursday Night | 31°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Friday | 55°F | Mostly Sunny | 0 to 5 mph ESE | 0% |
| Friday Night | 32°F | Partly Cloudy | 1 to 5 mph W | 0% |
| Saturday | 58°F | Mostly Sunny | 1 to 7 mph ESE | 0% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 3 mph NW | 0% |
| Sunday | 62°F | Mostly Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 36°F | Mostly Cloudy | 2 mph NNW | 0% |
| Monday | 60°F | Partly Sunny | 2 mph NNE | 1% |
| Monday Night | 36°F | Mostly Cloudy | 2 mph W | 6% |
| Tuesday | 63°F | Mostly Sunny | 0 to 3 mph N | 6% |
| Tuesday Night | 37°F | Partly Cloudy | 0 to 3 mph W | 10% |
Forecast source: National Weather Service (api.weather.gov) for Harper (43.857, -117.627). Updated through the day.
Growing snapshot for Harper
Last spring frost
May 7
First fall frost
Oct 3
Growing season
147 days
Hardiness zone
6a
More local growing data for Harper: nearby ZIP 97920 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Westfall, Or (5.5 mi from Harper). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.