Oregon Hardiness Zones

Oregon covers USDA plant hardiness zones 5a to 9b on the 2023 map, so its coldest areas average −20 to −15 °F on the coldest winter night. Find your zone by ZIP code, or pick a city below for its zone, sunrise and daylight by month.

Oregon hardiness zone map

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This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km. Dots mark cities with their own page.

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.

Zones and daylight by city

City	Zone	Coldest night	Longest day	Shortest day
Portland	9a	20 to 25 °F	15h 41m	8h 42m
Salem	8b	15 to 20 °F	15h 37m	8h 47m
Eugene	8b	15 to 20 °F	15h 30m	8h 53m
Gresham	8b	15 to 20 °F	15h 41m	8h 42m
Hillsboro	8b	15 to 20 °F	15h 41m	8h 42m
Bend	6b	−5 to 0 °F	15h 30m	8h 53m
Medford	8b	15 to 20 °F	15h 17m	9h 05m
Corvallis	8b	15 to 20 °F	15h 34m	8h 49m
Ashland	8a	10 to 15 °F	15h 16m	9h 06m

Gardening in Oregon?

Your zone says what survives winter. Deconstruct Sun measures how many hours of direct sun your exact spot gets, so you can pick plants that thrive. Free on iPhone.

Questions

What hardiness zones are in Oregon?

Oregon spans USDA zones 5a to 9b on the 2023 map. Among its larger cities, Bend is coldest (zone 6b) and Portland is warmest (zone 9a).

How do I find my exact zone in Oregon?

Enter your ZIP code in the hardiness zone lookup on this site. It reads the 2023 USDA data for that ZIP and warns you if you are near a zone boundary.

How much sun do gardens in Oregon get?

In Portland, an open spot gets up to 15.7 hours of daylight in June but only 8.7 in December. Trees and buildings cut that down, especially in winter. The Deconstruct Sun app measures the real direct-sun hours for one exact spot.