Harper, OR Weather & Growing Conditions
Overnight
51°F
Partly Cloudy
Partly cloudy, with a low around 51. North wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Partly Cloudy | 7 mph N | 2% |
| Saturday | 77°F | Sunny | 6 mph N | 2% |
| Saturday Night | 53°F | Mostly Clear | 6 mph NNE | 1% |
| Sunday | 77°F | Sunny | 2 to 7 mph ESE | 0% |
| Sunday Night | 54°F | Mostly Clear | 7 mph ENE | 0% |
| Monday | 78°F | Sunny | 1 to 7 mph ESE | 0% |
| Monday Night | 55°F | Partly Cloudy | 5 to 10 mph NE | 0% |
| Tuesday | 81°F | Sunny | 6 mph SE | 0% |
| Tuesday Night | 56°F | Mostly Clear | 5 mph NNE | 0% |
| Wednesday | 81°F | Sunny | 0 to 7 mph SE | 0% |
| Wednesday Night | 55°F | Mostly Clear | 5 to 8 mph NW | 1% |
| Thursday | 80°F | Sunny | 1 to 5 mph NE | 0% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph NE | 1% |
| Friday | 77°F | Mostly Sunny | 2 to 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harper, OR
Last spring frost
May 7
First fall frost
Oct 3
Growing season
147 days
Hardiness zone
6a
Explore more for Harper, OR: full frost dates · planting calendar · Oregon frost dates
Climate data from the nearest NOAA station, Westfall, Or (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.