What Growing Zone Is Oregon In?
USDA hardiness zones
5b to 9b
2023 USDA Plant Hardiness Zone Map
Oregon spans USDA hardiness zone 5b to 9b across its major population centers, according to the 2023 USDA Plant Hardiness Zone Map. That's a real range, not a single number: where you fall in it depends on where in the state you actually are.
Hardiness zone for ZIP 97204 (Portland)
Your USDA hardiness zone
Zone 9a
Avg. annual minimum (°F)
20°F to 25°F
Avg. annual minimum (°C)
-7°C to -4°C
Nearest reference point: Portland, OR
This is a regional estimate based on the nearest of 826 reference points, each matched to the official 2023 USDA zone map. It’s accurate to within about a half-zone across most of the country, but elevation shifts zones over short distances, so if you’re in mountainous terrain, check the official USDA map for your exact address (see Sources below).
Oregon's USDA Hardiness Zones
Here's how the zone shifts across Oregon's major cities:
For your exact zone by ZIP code, use the Hardiness Zone Finder, and for what a zone number actually measures (and doesn't), see how zones actually work.
Frost Dates in Oregon
Frost dates track zone, so they shift across Oregon the same way the zone number does:
- High desert (Burns) (zone 5): average last frost Apr 8 - Apr 22, average first frost Oct 8 - Oct 22.
- Southern coast (Florence) (zone 9): average last frost Feb 8 - Feb 22, average first frost Dec 8 - Dec 22.
These are averages, not guarantees. For your specific frost window, use the Frost Date Calculator. For a full vegetable-by-vegetable planting calendar already calculated from Oregon's frost dates, see the Oregon Planting Calendar.
Oregon's coastline alone spans two zones -- roughly 9a from Astoria down to Sand Lake, and 9b from Sand Lake to Brookings -- on top of a much larger west-to-east spread driven by the Cascade Range, per Oregon State University Extension.
What Grows Well in Oregon's Zones
A few real, zone-appropriate picks recommended by Oregon State University Extension Service for Oregon landscapes: not an exhaustive list, but a genuine starting point.
- Serviceberry (Amelanchier alnifolia)
- Ninebark 'Diablo' (Physocarpus opulifolius 'Diablo')
- Flowering currant (Ribes sanguineum)
- Snowberry (Symphoricarpos albus)
- Manzanita (Arctostaphylos spp.)
- California lilac (Ceanothus spp.)
Ready to find your exact zone? Use the Hardiness Zone Finder: enter your ZIP code for a precise match against the 2023 USDA map.
Oregon Growing Zone FAQ
What growing zone is Oregon in?
Oregon spans USDA hardiness zones 5b to 9b on the 2023 USDA Plant Hardiness Zone Map. Burns is zone 5b and Bend is zone 6b; enter your ZIP code in the Hardiness Zone Finder for your exact zone.
What growing zone is Portland, OR?
Portland is in USDA hardiness zone 9a on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Salem, OR?
Salem is in USDA hardiness zone 8b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Eugene, OR?
Eugene is in USDA hardiness zone 8b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Medford, OR?
Medford is in USDA hardiness zone 8b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
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The Spacing & Planting Cheat Sheet
When to start, when to plant, how far apart.
Sources & further reading
Zone and city data checked against the official USDA Plant Hardiness Zone Map. Plant recommendations sourced from Oregon State University Extension Service. Climate note sourced from Oregon State University Extension Service. For more on how we build and verify reference data across this site, see our methodology page.
Growing zones in nearby states
Gardening near a state line? Zones don't stop at the border:
Or browse all 51 state growing-zone guides.