Deconstruct SunPortland, OR: Hardiness Zone 9a & Sunlight by Season
Portland is in USDA hardiness zone 9a. Here’s what that means for winter, plus sunrise, sunset, daylight hours and the sun’s path through the year.
Zone 9a in Portland
On the 2023 USDA Plant Hardiness Zone Map, Portland falls in zone 9a. That means the coldest night of a typical winter drops to between 20 and 25 °F. Perennials, shrubs and trees labeled for zone 9a or colder (a lower number) should survive the winter here. Parts of the area sit near the boundary with zone 8b, so a sheltered courtyard or an exposed hilltop can behave like the neighboring zone.
A zone only covers winter cold. For a plant to do well it also needs the right amount of sun, and that varies far more from one corner of a yard to the next than the zone does across town.
This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km.
Nearby cities
- Vancouver, WA Zone 8b
- Gresham, OR Zone 8b
- Hillsboro, OR Zone 8b
- Salem, OR Zone 8b
- Corvallis, OR Zone 8b
- Olympia, WA Zone 8b
- Eugene, OR Zone 8b
- Tacoma, WA Zone 8b
The sun over Portland
On the June solstice the sun rises in the northeast at 5:21 AM and climbs to 68° above the horizon at 1:12 PM. On the December solstice the noon sun reaches only 21°, so a 20-foot tree casts a noon shadow about 52 feet long. In June the same tree’s noon shadow is only 8 feet.
Sunrise, sunset & daylight by month
| Date | Sunrise | Sunset | Daylight | Noon sun |
|---|---|---|---|---|
| Jan 21 | 7:42 AM | 5:01 PM | 9h 19m | 25° |
| Feb 21 | 7:02 AM | 5:46 PM | 10h 44m | 34° |
| Mar 21 | 7:11 AM | 7:24 PM | 12h 13m | 45° |
| Apr 21 | 6:14 AM | 8:04 PM | 13h 51m | 57° |
| May 21 | 5:33 AM | 8:41 PM | 15h 08m | 65° |
| Jun 21 | 5:21 AM | 9:03 PM | 15h 41m | 68° |
| Jul 21 | 5:42 AM | 8:51 PM | 15h 09m | 65° |
| Aug 21 | 6:18 AM | 8:07 PM | 13h 49m | 56° |
| Sep 21 | 6:56 AM | 7:09 PM | 12h 13m | 45° |
| Oct 21 | 7:35 AM | 6:14 PM | 10h 39m | 34° |
| Nov 21 | 7:18 AM | 4:34 PM | 9h 16m | 24° |
| Dec 21 | 7:47 AM | 4:29 PM | 8h 42m | 21° |
Local time (Los Angeles), including daylight saving time. “Noon sun” is the sun’s height above the horizon at solar noon.
Daylight through the year
What “full sun” means in Portland
Full sun is 6+ hours of direct sun. In Portland an open spot has 15.7 hours of daylight to work with in June and 8.7 in December, so a bed that clears 6 hours in summer can easily drop to part shade in winter once the low sun slips behind trees and houses.
Measure the sun in your Portland yard
Daylight is the ceiling. Deconstruct Sun traces the trees and buildings around one exact spot and tells you its real direct-sun hours, today and at every solstice and equinox.
Questions
What hardiness zone is Portland, OR in?
Portland, Oregon is in USDA plant hardiness zone 9a on the 2023 map. The average coldest winter night is 20 to 25 °F (−6.7 to −3.9 °C). It is near the boundary with zone 8b.
How many hours of daylight does Portland get?
About 15.7 hours on the June solstice (sunrise 5:21 AM, sunset 9:03 PM) and 8.7 hours on the December solstice (sunrise 7:47 AM, sunset 4:29 PM). Around the equinoxes it is close to 12 hours.
How many hours of sun does my Portland yard get?
Up to the daylight hours above, minus whatever trees, buildings and fences block. In winter, when the sun stays low, that can be most of it. The Deconstruct Sun iPhone app measures the real direct-sun hours for one exact spot by having you trace what is around it.
When is the best time to plant in Portland?
Zone 9a tells you which perennials survive winter, not planting dates. For timing, use your local average frost dates from your county extension office, and choose plants rated for zone 9a or colder.
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30. Sun times calculated for 45.537, -122.650.