Harper, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harper, a community in Malheur County, Oregon.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. Northwest wind around 6 mph.
7-day forecast for Harper
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 6 mph NW | 5% |
| Tonight | 52°F | Partly Cloudy | 2 to 8 mph NW | 12% |
| Saturday | 82°F | Sunny | 5 mph NNW | 2% |
| Saturday Night | 54°F | Mostly Clear | 0 to 3 mph WNW | 0% |
| Sunday | 83°F | Sunny | 0 to 7 mph N | 0% |
| Sunday Night | 54°F | Mostly Clear | 0 to 8 mph ENE | 0% |
| Monday | 84°F | Sunny | 0 to 7 mph NNE | 0% |
| Monday Night | 56°F | Partly Cloudy | 1 to 7 mph N | 0% |
| Tuesday | 86°F | Sunny | 1 to 6 mph ENE | 1% |
| Tuesday Night | 56°F | Mostly Clear | 1 to 7 mph NNE | 2% |
| Wednesday | 85°F | Sunny | 0 to 6 mph N | 0% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 8 mph NNE | 1% |
| Thursday | 87°F | Sunny | 0 to 7 mph ENE | 0% |
| Thursday Night | 56°F | Partly Cloudy | 1 to 9 mph S | 0% |
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 Sep 19, 2026.