Harper, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harper, a community in Malheur County, Oregon.
Overnight
55°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 55. South southwest wind around 5 mph.
7-day forecast for Harper
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Areas Of Smoke | 5 mph SSW | 0% |
| Tuesday | 92°F | Smoke | 1 to 6 mph ESE | 0% |
| Tuesday Night | 60°F | Areas Of Smoke | 2 to 6 mph WSW | 0% |
| Wednesday | 97°F | Smoke | 1 to 7 mph ESE | 0% |
| Wednesday Night | 64°F | Areas Of Smoke | 2 to 8 mph S | 0% |
| Thursday | 102°F | Areas Of Smoke | 0 to 5 mph SE | 0% |
| Thursday Night | 66°F | Patchy Smoke | 2 to 8 mph S | 0% |
| Friday | 102°F | Sunny | 2 to 8 mph W | 0% |
| Friday Night | 67°F | Mostly Clear | 5 to 13 mph NW | 0% |
| Saturday | 101°F | Sunny | 3 to 7 mph WNW | 0% |
| Saturday Night | 66°F | Mostly Clear | 5 to 13 mph NW | 0% |
| Sunday | 97°F | Sunny | 3 to 8 mph WNW | 0% |
| Sunday Night | 64°F | Mostly Clear | 6 to 13 mph NW | 0% |
| Monday | 96°F | Sunny | 2 to 7 mph NNW | 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 Aug 4, 2026.