Generally — Most Areas
eastern red cedar (zones 3-9) suits most of Oregon (5a-10a) — zones 5-9 are in range, and the rest of the state is the exception.
Eastern Red Cedar in Oregon — the short answer
Eastern Red Cedar in Oregon: hardy in zones 3–9, full sun, against a state median of ~213 frost-free days.
- Plant zones
- 3-9
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Oregon zones
- 5a-10a
- USDA PHZM 2023
- Frost window
- Feb 25 - Apr 26 – Oct 19 - Nov 26
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 86 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Oregon spans zones 5a-10a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score eastern red cedar against your parcel's actual hardiness, soil, and sun.
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Oregon is not one climate
Oregon’s winter-low ladder runs across 36 counties, from zone 6 in Klamath County to zone 9.5 in Curry County. That is 35°F between the two counties’ average coldest night — the difference between eastern red cedar overwintering in the ground and coming under cover.
The middle half of 36 counties runs 6.5–8.5 zones, with a median of 7.5 zones — a 3.5-zone span end to end.
Measured across 36 Oregon counties. USDA PHZM 2023, per county. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Oregon Fits Best
Eastern Red Cedar is rated for zones 3–9 — a cold floor USDA puts at -40 to -30°F. Against Oregon’s 36 counties that band holds in 35 of them, and the line runs at Klamath County (zone 6a), the coldest county still inside it.
Inside zones 3–9
35 counties
- Baker County · zone 6b
- Crook County · zone 6b
- Deschutes County · zone 6b
3 of 35 shown
Above the zone 9 ceiling
1 county
- Curry County · zone 9b
Too little winter chill rather than too much cold — a low-chill selection is what changes it.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. A zone is a 10°F band of average annual extreme minimum temperature, so the floor above is the band the plant's rating denotes, not a single measured kill point. Slope, shelter and cold-air drainage routinely move a site half a zone either way from its county figure — which is the part only your address resolves.
Even within Oregon's zones 5a-10a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for eastern red cedar (USDA PHZM 2023):
Zone Comparison
Eastern Red Cedar Needs
- USDA Zones: 3-9
- Sun: Full Sun
- Mature size: 45 ft tall
- Drought tolerance: High
Oregon Has
- USDA Zones: 5a-10a
- Last Hard Freeze (28°F): Feb 25 - Apr 26
- First Hard Freeze (28°F): Oct 19 - Nov 26
- Annual Rainfall: 8-90 inches
- Common Soils: Volcanic, Silt loam (Willamette), Sandy loam
Plant Zone Range (zones 3-9)
Preferred Soil pH
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Eastern Red Cedar in Oregon
The frost window
Across Oregon, the last spring hard freeze (28°F) clears between Feb 25 and Apr 26, and the first fall hard freeze lands between Oct 19 and Nov 26 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 176-day window you can count on — up to 274 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
Oregon runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for eastern red cedar, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether eastern red cedar is a permanent planting or a replant-every-spring crop for you turns on your own zone within Oregon; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
The zone check says eastern red cedar survives winter in part of Oregon, not across all of it. Whether the season is long enough — and warm enough — is a different question.
Chill hours
Eastern Red Cedar requires ~800 chill hours (32-45°F dormancy window). Oregon typically banks ~2500 chill hours per winter (from PRISM 1991-2020 climate normals), which keeps this plant on track.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Eastern Red Cedar tolerates a wide pH range (pH 4.7-8) — 3.3 units, acid ground through alkaline — so soil acidity is rarely what limits it in Oregon. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Oregon soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Eastern Red Cedar in Oregon
Zone compatibility tells you about winter cold survival — but Oregon growers also need to think about:
West side: excessive rain and overcast skies reduce sun for warm-season crops
East side: arid conditions (8-15 inches rainfall) require irrigation
Slug pressure is extreme in western Oregon
Mountain areas have very short seasons (60-90 frost-free days)
What to actually do about these — and the constraints that apply to every Oregon grower, not just eastern red cedar — is covered on the Oregon growing guide.
Where in Oregon Eastern Red Cedar Is Zone-Hardy
Eastern Red Cedar is rated for USDA zones 3–9. 35 of Oregon’s 36 counties fall inside that band. The coldest that does is Klamath County at zone 6a. 1 county sits above its zone 9 ceiling, where the limit is too little winter chill rather than too much cold. Where you are in Oregon decides this one.
Across those 36 counties Oregon’s winter-low ladder runs from zone 6a in Klamath County to zone 9b in Curry County — 3.5 USDA zones of spread, which is 35°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Klamath County holds its last hard freeze (28°F) until about Jun 9, while Lincoln County is clear by Feb 3 — 126 days apart. Set eastern red cedar out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Eastern Red Cedar’s zone 3–9 band: USDA PLANTS / Growable Ground plant database. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Oregon Cooperative Extension
For Oregon-specific cultivar recommendations, planting calendars, and pest pressure for eastern red cedar, the canonical source is OSU Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Eastern Red Cedar native to Oregon?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Eastern Red Cedar as native to Oregon. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Eastern Red Cedar in Oregon
When can I plant Eastern Red Cedar in Oregon?
Oregon's last spring hard freeze (28°F) clears between Feb 25 and Apr 26, and the first fall hard freeze lands between Oct 19 and Nov 26 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Eastern Red Cedar, so this page does not state whether it overwinters in Oregon and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Eastern Red Cedar grown in across Oregon?
Oregon spans USDA hardiness zones 5a-10a (USDA ARS PHZM 2023). Eastern Red Cedar carries a range of zones 3-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Oregon site have?
A typical Oregon site sees ~213 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Eastern Red Cedar should be matched against that window, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Eastern Red Cedar native to Oregon?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Eastern Red Cedar as native to Oregon. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Eastern Red Cedar in Oregon?
Eastern Red Cedar tolerates pH 4.7-8 (USDA PLANTS). That is a 3.3-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Oregon site — amend for drainage and organic matter first.
Will Eastern Red Cedar actually grow on my specific land in Oregon?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores eastern red cedar against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Oregon
State-level data is a sketch. Your Growable Ground report scores eastern red cedar against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Oregon eastern red cedar averages can't show:
We read public map data around Oregon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Oregon eastern red cedar average
Explore More
Growing guides for eastern red cedar
Explore Oregon county by county
Oregon carries 36 counties with their own USDA zone — a sample of the growing pages for eastern red cedar there:
Where else eastern red cedar grows
Eastern Red Cedar's zone band crosses state lines — these are the states closest to Oregon in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Oregon
Oregon has a growing page for 1,038 plants — a rotating sample of the rest of the shelf.
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