Oregon runs from USDA zone 4a to 9b, and no single hedge list fits that spread. Of twelve widely planted hedge species, four survive in every zone of the state, eight survive in only part of it, and none fail everywhere. The eight are where mistakes happen. A privet suited to the cold interior is out of its range in the mildest zones, while Leyland cypress is the reverse. Find your zone first, then choose the plant. For background on the whole subject, see Hedges.
What actually holds in Oregon
Zone numbers here come from the USDA Plant Hardiness Zone Map 2023, which rests on one variable: the average annual extreme minimum temperature. It says nothing about summer heat, wind or wet feet. And “holds” means survives, not thrives. The upper end of a plant’s range often marks where heat starts wearing it down rather than where cold kills it, so a shrub on the edge of its range can live for years and still look tired.
The eight that depend on your zone
Here is what falls outside each plant’s range within Oregon’s 4a to 9b spread:
| Plant | Hardy zones | Outside its range in Oregon |
|---|---|---|
| Arrowwood viburnum | 4a to 8b | 9a, 9b |
| Boxwood | 5a to 8b | 4a, 4b, 9a, 9b |
| Cherry laurel | 6a to 8b | 4a to 5b, 9a, 9b |
| Leyland cypress | 6a to 9b | 4a to 5b |
| Privet | 4a to 7b | 8a to 9b |
| Yew | 4a to 7b | 8a to 9b |
| Arborvitae | 4a to 7b | 8a to 9b |
| Eastern hemlock | 4a to 7b | 8a to 9b |
Read it from both ends. In the coldest zones, 4 and 5a, Leyland cypress and cherry laurel will not make it, and boxwood is out in zone 4. In the mild zones, 8 and 9, privet, yew, arborvitae and eastern hemlock are past their limit at 7b. Zone 9 also drops boxwood, cherry laurel and arrowwood viburnum, which stop at 8b. Only Leyland carries through 9b.
Your own zone is a ZIP code lookup on the USDA map, and it can differ from a town twenty miles away. Gardeners east of the Cascades in the colder zones can also compare notes with Hedge Plants for Idaho: What Holds, and What Only Looks Hardy and Hedge Plants for Montana: What Holds, and What Only Looks Hardy, since those states share the same cold-end problems.
The four that hold across every zone
American hornbeam grows about 12 inches a year and reaches 6 to 15 feet as a hedge. It is deciduous, trimmed in midsummer after the first flush of growth. Inkberry holly is the evergreen option, growing 6 to 12 inches a year to 5 to 15 feet. Winterberry holly grows at the same pace and height but loses its leaves in winter, so it screens only half the year. Both hollies are pruned in late winter while dormant.
Eastern red cedar is the fast one, adding 12 to 24 inches a year and reaching 8 to 20 feet as a screen. It takes light cuts only in late winter, and it belongs on the list of plants that cannot be cut back hard (more on that next). Surviving in every zone is not the same as liking every site, so soil and exposure still count.
The hedges you can never cut back down
Most hedge plants forgive a bad haircut. Cut a boxwood or privet down to stubs and it sprouts from old wood. Three of the twelve do not. Cut a branch back to bare, leafless wood and no new growth emerges from it, so the hedge keeps the gap permanently. The size you let these grow to is the size you live with, or the plant comes out.
- Leyland cypress (zones 6a to 9b) grows 3 to 4 feet a year and reaches 15 to 25 feet as a screen. It is pruned from late spring to midsummer and cannot regrow from old wood.
- Arborvitae (Thuja occidentalis, zones 4a to 7b) grows 6 to 9 inches a year and stays at 4 to 15 feet as a hedge. Prune it in late winter before growth starts, or in midsummer. It does not regrow from old wood either.
- Eastern red cedar (every zone) adds 12 to 24 inches a year and reaches 8 to 20 feet. It takes light cuts only in late winter and will not regrow from old wood.
Leyland is the one that catches people. At 3 to 4 feet a year, a hedge planted at 3 feet and gaining 3 feet each year reaches 15 feet in four years, and 15 feet is the bottom of its screen range. Plenty of suburban lots have a row planted four feet from a property line or a roofline that is now a wall of foliage. Topping it halfway down leaves brown, bare stubs that stay brown. If the lot cannot take a 15-to-25-foot plant, Leyland is the wrong choice at any price.
Arborvitae is slower, which feels safer and mostly is. A hedge growing 6 to 9 inches a year needs only a light annual trim to hold its width. The trap is letting it get ahead of you, then cutting past the green foliage. Trim a little each year, always into foliage, and it behaves.
Everything else on the list, including boxwood, privet, cherry laurel, yew, eastern hemlock, arrowwood viburnum, hornbeam and both hollies, regrows from old wood. Hemlock does best with light cuts, but a hard renovation is survivable for it. For an owner who wants the option to start over, that single difference matters more than the choice between evergreen and deciduous.
Matching the plant to the job
Start with how tall the hedge needs to be and how often you want to cut it, since growth rate and mature height decide both.
For low, formal, clipped edges, boxwood (2 to 6 feet, growing 3 to 6 inches a year) and yew (3 to 8 feet, 6 to 12 inches a year) are the slow, tidy choices. Both are slow enough that one trim a year is plenty. Boxwood is pruned in late spring after the last frost and yew in late spring after the new growth hardens. They are also zone-limited: boxwood from 5a to 8b, yew from 4a to 7b.
For privacy at eye level and above, the choices split by speed. Eastern hemlock (10 to 20 feet, 12 to 24 inches a year, zones 4a to 7b, light cuts only) and Leyland (zones 6a to 9b) are the tall evergreen options. Arrowwood viburnum (6 to 10 feet, 12 to 24 inches a year, zones 4a to 8b) is a deciduous alternative, pruned right after flowering. Cherry laurel (6 to 15 feet) grows only 1 to 2 feet a year but holds its leaves in zones 6a to 8b and is pruned in late spring after flowering.
Common privet (4 to 12 feet, 2 to 3 feet a year, zones 4a to 7b) is the high-maintenance one. It wants two cuts a season, in spring and midsummer. It rewards that with a dense hedge and forgives neglect better than most, because it regrows from old wood.
Timing the cuts
Spring pruning dates depend on where frost ends. At Portland, NOAA NCEI’s 1991-2020 normals put the last 32°F freeze between March 6 and March 21, and the first fall freeze between November 11 and November 27. East of the Cascades the picture changes: central and eastern Oregon are high desert with a far shorter season, so those Portland windows should not be borrowed. There, wait until frost risk has passed on your own lot before shearing a boxwood, and stop pruning early enough that new growth hardens before fall.
The ground you are planting into
Oregon’s official state soil, named by law in 2011, is the Jory series. Its surface layer is an Ultisol, an old, heavily weathered and leached soil that is naturally acid and low in nutrients. USDA NRCS records a representative surface pH of about 5.6, slightly acid. Texture is 14 percent sand, 34 percent clay and 52 percent silt, with about 5.0 percent organic matter. It is well drained despite the clay.
That combination tells you what the state’s ground tends to do. It leans acid, holds nutrients less well than it holds water, and sheds extra water rather than sitting wet. Hedge roots like that drainage, but fast feeders such as Leyland and privet may need regular feeding where nutrients are low.
Still, Jory represents the state, not your yard. Oregon has hundreds of soil series, and river bottoms, high-desert flats and any lot a builder has scraped or filled can look nothing like it. The pH of 5.6 is a typical surface value for that series, not a number to assume for your bed. Before planting a row of anything, get your own pH and nutrient numbers with a soil test. Oregon State University Extension and county offices can point you to labs and read the results with you.
Dig a test hole before planting, too. Fill it with water, let it drain, then fill it again. If the second fill is still standing after several hours, drainage on that spot is the problem, and no hardiness zone will fix it. Raise the planting line or pick another spot.
Common questions
Which hedge plants survive anywhere in Oregon?
American hornbeam, inkberry holly, winterberry holly and eastern red cedar are hardy across the whole 4a to 9b range. Hornbeam and winterberry lose their leaves in winter. Inkberry holly and red cedar keep theirs.
Can I grow Leyland cypress in colder parts of Oregon?
Leyland is hardy in zones 6a to 9b, so zones 4 and 5 are outside its range. It also grows 3 to 4 feet a year and cannot regrow from old wood, which makes it a poor fit for small lots even where it survives.
Which hedges can I cut back hard if they get too big?
Boxwood, privet, cherry laurel, yew, eastern hemlock, arrowwood viburnum, hornbeam and both hollies all regrow from old wood. Leyland cypress, arborvitae and eastern red cedar do not.
When should I prune?
It depends on the plant. Boxwood is pruned in late spring after the last frost, arrowwood viburnum right after flowering, and both hollies in late winter while dormant. Frost timing varies a lot between western Oregon and the high desert, so use your own local last-frost date, and check your county extension office if you are unsure.