Oregon Planting Zones by City and ZIP Code
Oregon runs from zones 5b to 9b; 40% of its ZIPs are 8b, Portland is 9a and Eugene is 8b.
Oregon runs from zones 5b to 9b
The coldest night of the winter averages -15°F to -10°F in the coldest of Oregon’s ZIP codes and 25°F to 30°F in the warmest. Most of the state is zone 8b.
Planting zones of Oregon cities
| City | Zone | Coldest night, on average | Since 2012 |
|---|---|---|---|
| Portland97204 | 9a | 20°F to 25°F | same as 2012 |
| Eugene97401 | 8b | 15°F to 20°F | same as 2012 |
| Medford97501 | 8b | 15°F to 20°F | same as 2012 |
| Bend97701 | 6b | -5°F to 0°F | same as 2012 |
| Pendleton97801 | 7a | 0°F to 5°F | same as 2012 |
| Astoria97103 | 8b | 15°F to 20°F | same as 2012 |
Tap a ZIP for that address’s frost dates and this month’s jobs.
Find your zone anywhere in Oregon
A ZIP code or a town gives you its zone, how it moved since 2012, the frost dates at the nearest NOAA station, and the jobs for this month timed from them.
What to plant in Oregon this month
The calendar for each of Oregon's main zones, from vegetables to pruning and winter protection, each job tied to the extension page it comes from. Pick a month, or read the whole year below it.
Timed from the median frost dates of the 45 NOAA stations in Oregon’s zone 8b: last spring frost Apr 12, first fall frost Nov 1. Your own ZIP’s frost dates move every window, so the ZIP tool times them for you.
Pick a month above to see every job in it.
The year at a glance
- Start vegetable seeds indoorsJan to Apr
- Sow vegetables in the gardenMar to Apr
- Sow the fall vegetable gardenJul to Sep
- Set out transplantsMar to May
- Plant trees and shrubsSep 20 to Apr 26
- Plant garlicOct 18 to Nov 22
- Plant pre-chilled tulip bulbsNov 20 to Dec 31
- Divide fall-blooming perennialsMar 22 to May 3
- Divide spring and summer-blooming perennialsSep 20 to Nov 1
- Prune trees and summer-flowering shrubs while dormantMar 1 to Apr 12
- Prune spring-flowering shrubs after they bloomMar 29 to May 24
- Prune out cold damageApr 12 to May 24
- Cover tender plants on a freezing nightOct 25 to Apr 12
- Cut back perennials after a hard freezeNov 8 to Dec 6
What changed in Oregon since 2012
Every ZIP on both mapsCompared ZIP by ZIP from the 2023 and 2012 USDA tables; 473 Oregon ZIP codes appear in both.
Why Oregon’s zones moved
Every city above is in the same half zone it was on the 2012 map.
The USDA explains the national picture: “When compared to the 2012 map, the 2023 version reveals that about half of the country shifted to the next warmer half zone, and the other half of the country remained in the same half zone.” The new map uses 1991 to 2020 and more than 13,000 weather stations, so it draws Oregon’s hills, valleys and cities more finely than the 2012 map did.
A warmer zone changes which perennials and shrubs come through the winter, not when the garden gets planted; that still follows the frost dates.
Frost dates and seed starting in Oregon
Oregon planting zone questions
Planting zones by state
Sources. USDA Plant Hardiness Zone Map, ZIP code tables (2023 and 2012), PRISM Climate Group, Oregon State University; USDA Plant Hardiness Zone Map; USDA Unveils Updated Plant Hardiness Zone Map (USDA Agricultural Research Service, November 15, 2023); NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal, by station (v1.0.1); NC State Extension Gardener Plant Toolbox. Zones are read from the PRISM ZIP code tables, read Oct 9, 2026; a ZIP code’s zone is the zone at its center. The calendar’s extension sources are listed on the planting zones page and under each job.