What Hardiness Zone Is Oregon?

Q: What hardiness zone is Oregon?

Oregon is in USDA hardiness zones 5b–9b on the 2023 USDA Plant Hardiness Zone Map. Zone 8b is the most common, covering 40% of Oregon's ZIP codes, and zone 9a covers 24%. Enter your ZIP code for your exact zone.

Q: What does zone 8b mean?

Zone 8b means the average annual extreme minimum temperature, the coldest night of a typical winter, is 15°F to 20°F (−9°C to −7°C). Perennials, shrubs and trees rated for zone 8b or colder should survive winter there.

Q: What is the coldest hardiness zone in Oregon?

Zone 5b is the coldest zone mapped in Oregon, found around Seneca, and zone 9b is the warmest, found around Newport 1 SE.

Q: Did Oregon's hardiness zones change in 2023?

The USDA released a new Plant Hardiness Zone Map in November 2023, based on 1991–2020 temperatures instead of 1976–2005. About half of the United States shifted half a zone warmer. Check your ZIP code here, because plant tags and older books may still list your 2012 zone.

Q: When should I plant in zone 8b?

Hardiness zones don't set planting dates; frost dates do. Inside zone 8b in Oregon, the median last spring frost varies from February 25 to May 16. Look up your local frost dates and plant tender crops such as tomatoes after the 10%-risk last-frost date.

USDA 2023 Plant Hardiness Zone Map · 473 ZIP codes · Data updated 2026-10-28

Quick answer

Oregon spans USDA hardiness zones 5b–9b on the 2023 Plant Hardiness Zone Map. The most common zone is 8b, covering 40% of Oregon's ZIP codes, followed by zone 9a (24%). Zone 8b means the coldest night of an average winter reaches 15°F to 20°F (−9°C to −7°C). Enter your ZIP code for your exact zone.

Oregon hardiness zones by share of ZIP codes

Zone 5b<1% · 1 ZIP

Zone 6a6% · 27 ZIPs

Zone 6b13% · 62 ZIPs

Zone 7a8% · 37 ZIPs

Zone 7b4% · 17 ZIPs

Zone 8a3% · 14 ZIPs

Zone 8b40% · 189 ZIPs

Zone 9a24% · 115 ZIPs

Zone 9b2% · 11 ZIPs

What the zones mean for Oregon gardeners

Coldest and warmest towns: among towns with NOAA weather stations, Seneca (4,660 ft) is in zone 5b, while Newport 1 SE (8 ft) is in zone 9b. That is a difference of about 40°F in the coldest night of a typical winter.
Same zone, different frost dates: within zone 8b, the median last spring frost ranges from February 25 at Portland Kgw-tv to May 16 at Sexton Summit, 80 days apart. Your zone tells you which perennials survive winter; your frost dates tell you when to plant.

Typical frost dates in each Oregon zone

Medians across NOAA weather stations in each zone. Colder zones usually have later spring frosts, but local terrain can shift the dates by weeks.

Zone	Last spring frost	First fall frost	Stations
6a	June 7	September 28	5
6b	June 5	September 18	14
7a	May 7	October 9	15
7b	April 27	October 7	7
8a	May 5	October 11	8
8b	April 11	November 1	43
9a	March 26	November 18	28
9b	February 28	December 7	6

Hardiness zones for Oregon cities

Zones at the National Weather Service stations, mostly city airports, with their median frost dates.


Astoria Regional Airport	9a	20°F to 25°F	9	Mar 26	Nov 11
Aurora State Airport	8b	15°F to 20°F	196	Mar 16	Nov 14
Baker City Municipal Airport	6b	−5°F to 0°F	3,361	May 25	Sep 15
Burns Municipal Airport	6a	−10°F to −5°F	4,140	Jun 11	Sep 6
Corvallis 10 SSW	8b	15°F to 20°F	312	Apr 11	Oct 30
Eugene Mahlon Sweet Airport	8b	15°F to 20°F	353	Apr 11	Oct 23
Hermiston Municipal Airport	7a	0°F to 5°F	641	Apr 26	Oct 10
Klamath Falls Intl Airport	6b	−5°F to 0°F	4,084	Jun 9	Sep 18
McMinnville Municipal Airport	8b	15°F to 20°F	159	Apr 15	Oct 26
Meacham	6b	−5°F to 0°F	3,723	Any month	Any month
Medford Rogue Valley Airport	8b	15°F to 20°F	1,297	Apr 8	Oct 29
North Bend Regional Airport	9a	20°F to 25°F	17	Feb 21	Dec 9
Ontario Municipal Airport	7a	0°F to 5°F	2,190	Apr 21	Oct 14
Portland Intl Airport	9a	20°F to 25°F	19	Mar 13	Nov 19
Portland Troutdale Airport	9a	20°F to 25°F	29	Mar 16	Nov 20
Portland-hillsboro Airport	8b	15°F to 20°F	204	Apr 16	Oct 23
Redmond Roberts Field	6b	−5°F to 0°F	3,043	Jun 9	Sep 14
Roseburg Regional Airport	8b	15°F to 20°F	525	Mar 19	Nov 20
Salem McNary Field	8b	15°F to 20°F	205	Apr 3	Nov 1
Scappoose Ind Airport	8b	15°F to 20°F	55	Apr 10	Nov 2
Sexton Summit	8b	15°F to 20°F	3,832	May 16	Oct 30

Hardiness zones for 133 towns in Oregon

Each NOAA weather station is shown with the USDA zone of the nearest ZIP code (within 8 miles). Coldest night is the zone's range for the average annual extreme minimum temperature. Click a column to sort.

Filter by town


Alsea Fh (fall Creek)	9a	20°F to 25°F	230	Apr 13	Nov 3
Ashland	8a	10°F to 15°F	1,729	May 6	Oct 8
Astoria Regional Airport	9a	20°F to 25°F	9	Mar 26	Nov 11
Aurora State Airport	8b	15°F to 20°F	196	Mar 16	Nov 14
Baker City Municipal Airport	6b	−5°F to 0°F	3,361	May 25	Sep 15
Bandon 2 NNE	9b	25°F to 30°F	23	Mar 9	Nov 27
Beaverton 2 SSW	9a	20°F to 25°F	270	Apr 1	Nov 6
Bend	6b	−5°F to 0°F	3,660	Jun 6	Sep 20
Boardman	7b	5°F to 10°F	280	Apr 14	Oct 21
Bonneville Dam	9a	20°F to 25°F	62	Mar 14	Nov 27
Burns Municipal Airport	6a	−10°F to −5°F	4,140	Jun 11	Sep 6
Cascade Locks	8a	10°F to 15°F	142	Mar 24	Nov 20
Cave Junction 1 WNW	8b	15°F to 20°F	1,377	May 1	Oct 12
Chiloquin 12 NW (fort Klamath)	6b	−5°F to 0°F	4,180	Any month	Any month
Clatskanie	8b	15°F to 20°F	22	Apr 24	Oct 24
Cloverdale	9b	25°F to 30°F	12	Mar 17	Nov 22
Condon	7a	0°F to 5°F	2,881	May 10	Oct 7
Coquille City	9a	20°F to 25°F	23	Mar 28	Nov 6
Corvallis 10 SSW	8b	15°F to 20°F	312	Apr 11	Oct 30
Corvallis State University	8b	15°F to 20°F	225	Apr 17	Oct 28
Corvallis Water Bureau	8b	15°F to 20°F	592	May 15	Oct 8
Cottage Grove 2E	8b	15°F to 20°F	595	Apr 24	Oct 25
Cottage Grove Dam	8b	15°F to 20°F	831	Apr 12	Nov 1
Crater Lake Nps HQ	6b	−5°F to 0°F	6,485	Any month	Any month
Dallas 2 NE	8b	15°F to 20°F	290	Apr 16	Nov 1
Detroit Dam	8b	15°F to 20°F	1,220	Mar 9	Dec 3
Drain	8b	15°F to 20°F	292	Apr 16	Oct 25
Dufur	7b	5°F to 10°F	1,330	May 12	Oct 7
Elgin	6b	−5°F to 0°F	2,697	May 24	Sep 18
Elkton 1SW	9a	20°F to 25°F	125	Apr 11	Nov 6
Estacada 2 SE	8b	15°F to 20°F	514	Mar 27	Nov 14
Eugene Mahlon Sweet Airport	8b	15°F to 20°F	353	Apr 11	Oct 23
Falls City 2 SSW	8b	15°F to 20°F	690	Apr 18	Nov 7
Fern Ridge-veneta	8b	15°F to 20°F	485	Apr 18	Oct 25
Florence #2	9a	20°F to 25°F	75	Apr 10	Nov 15
Forest Grove	8b	15°F to 20°F	180	Apr 16	Oct 26
Fort Clatsop Natl Memorial	9a	20°F to 25°F	42	Mar 30	Nov 18
Fossil	7a	0°F to 5°F	2,650	Jun 3	Sep 14
Foster Dam	8b	15°F to 20°F	550	Apr 12	Oct 28
Gold Beach Ranger Station	9b	25°F to 30°F	50	Feb 16	Dec 16
Government Camp	7a	0°F to 5°F	3,980	May 27	Oct 9
Grants Pass	8b	15°F to 20°F	932	Apr 8	Oct 28
Headworks Portland Wtr B	8b	15°F to 20°F	748	Mar 27	Nov 18
Heppner	7a	0°F to 5°F	1,885	Apr 26	Oct 19
Hermiston 2 NW	7b	5°F to 10°F	460	Apr 27	Oct 7
Hermiston Municipal Airport	7a	0°F to 5°F	641	Apr 26	Oct 10
Honeyman State Park	9a	20°F to 25°F	115	Mar 28	Nov 22
Hood River Experiment Station	8a	10°F to 15°F	500	Apr 20	Oct 13
Howard Prairie Dam	8a	10°F to 15°F	4,567	Jun 8	Sep 24
Huntington	7a	0°F to 5°F	2,110	Apr 23	Oct 13
Illahe	9a	20°F to 25°F	348	Mar 30	Nov 17
John Day	6b	−5°F to 0°F	3,063	May 28	Sep 18
Joseph	6a	−10°F to −5°F	4,184	May 24	Oct 1
Kent	7a	0°F to 5°F	2,710	May 15	Oct 11
Klamath Falls Intl Airport	6b	−5°F to 0°F	4,084	Jun 9	Sep 18
La Grande	6b	−5°F to 0°F	2,755	May 6	Oct 1
Lacomb 3 NNE	8b	15°F to 20°F	520	Apr 26	Oct 24
Lakeview 2 NNW	6b	−5°F to 0°F	4,890	Jun 4	Sep 17
Langlois #2	9a	20°F to 25°F	90	Mar 16	Nov 29
Leaburg 1 SW	8b	15°F to 20°F	675	Apr 3	Nov 11
Lebanon	8b	15°F to 20°F	330	Mar 14	Nov 18
Long Creek	6b	−5°F to 0°F	3,740	Jun 5	Sep 14
Lookout Point Dam	9a	20°F to 25°F	712	Mar 7	Nov 27
Lost Creek Dam	8a	10°F to 15°F	1,580	Apr 29	Oct 17
Madras	7a	0°F to 5°F	2,230	Any month	Any month
Malheur Branch Experiment Station	7a	0°F to 5°F	2,260	Apr 23	Oct 13
Mapleton	9a	20°F to 25°F	17	Feb 15	Dec 9
Marion Forks Fish Hatchery	7b	5°F to 10°F	2,475	May 15	Sep 30
Mc Minnville	8b	15°F to 20°F	155	Apr 5	Nov 7
McMinnville Municipal Airport	8b	15°F to 20°F	159	Apr 15	Oct 26
McNary Dam #2	7b	5°F to 10°F	361	Mar 30	Nov 4
Meacham	6b	−5°F to 0°F	3,723	Any month	Any month
Medford Rogue Valley Airport	8b	15°F to 20°F	1,297	Apr 8	Oct 29
Milton Freewater	7a	0°F to 5°F	970	Mar 25	Oct 29
Molalla 7NE	8b	15°F to 20°F	647	Mar 16	Nov 19
Monument 2	7a	0°F to 5°F	1,995	May 9	Sep 27
Moro	7a	0°F to 5°F	1,870	May 12	Oct 4
N Willamette Experiment Station	8b	15°F to 20°F	150	Mar 18	Nov 13
Nature Park-beaverton	9a	20°F to 25°F	185	Feb 11	Dec 5
Newport 1 SE	9b	25°F to 30°F	8	Feb 19	Dec 16
Newport 3N	9b	25°F to 30°F	220	Mar 12	Dec 10
North Bend Regional Airport	9a	20°F to 25°F	17	Feb 21	Dec 9
Oakridge Fish Hatchery	8b	15°F to 20°F	1,275	Apr 24	Oct 24
Ontario Municipal Airport	7a	0°F to 5°F	2,190	Apr 21	Oct 14
Oregon City	9a	20°F to 25°F	167	Mar 18	Nov 18
Otis 2 NE	9a	20°F to 25°F	150	Apr 4	Nov 16
Owyhee Dam	7a	0°F to 5°F	2,400	May 7	Oct 5
Paisley	6b	−5°F to 0°F	4,360	Jun 6	Sep 14
Parkdale 1 NNE	7b	5°F to 10°F	1,520	May 13	Oct 3
Pendleton Dwtn	7a	0°F to 5°F	1,040	Apr 22	Oct 9
Pilot Rock 1 SE	6b	−5°F to 0°F	1,720	May 7	Oct 4
Port Orford #2	9b	25°F to 30°F	42	Feb 17	Dec 3
Portland Intl Airport	9a	20°F to 25°F	19	Mar 13	Nov 19
Portland Kgw-tv	8b	15°F to 20°F	159	Feb 25	Dec 1
Portland Troutdale Airport	9a	20°F to 25°F	29	Mar 16	Nov 20
Portland WFO	9a	20°F to 25°F	21	Mar 13	Nov 22
Portland-hillsboro Airport	8b	15°F to 20°F	204	Apr 16	Oct 23
Powers	9a	20°F to 25°F	230	Mar 21	Nov 14
Prospect 2 SW	8a	10°F to 15°F	2,482	May 19	Oct 3
Redmond Roberts Field	6b	−5°F to 0°F	3,043	Jun 9	Sep 14
Rex 1 S	8b	15°F to 20°F	515	Mar 21	Nov 22
Richland	6b	−5°F to 0°F	2,215	May 10	Oct 1
Riddle	8b	15°F to 20°F	680	Mar 31	Nov 6
Riverside 7 SSW	6a	−10°F to −5°F	3,380	Jun 7	Sep 6
Rome 2 NW	6b	−5°F to 0°F	3,405	Jun 11	Sep 10
Roseburg Kqen	9a	20°F to 25°F	425	Mar 23	Nov 18
Roseburg Regional Airport	8b	15°F to 20°F	525	Mar 19	Nov 20
Ruch	8a	10°F to 15°F	1,550	May 4	Oct 13
Saint Helens Rfd	8b	15°F to 20°F	269	Apr 18	Nov 7
Salem McNary Field	8b	15°F to 20°F	205	Apr 3	Nov 1
Scappoose Ind Airport	8b	15°F to 20°F	55	Apr 10	Nov 2
Scotts Mills 9 SE	8b	15°F to 20°F	2,315	Apr 27	Nov 4
Seaside	9a	20°F to 25°F	10	Apr 2	Nov 12
Seneca	5b	−15°F to −10°F	4,660	Any month	Any month
Sexton Summit	8b	15°F to 20°F	3,832	May 16	Oct 30
Silver Creek Falls	8b	15°F to 20°F	1,350	Apr 30	Oct 22
Silver Lake Ranger Station	6a	−10°F to −5°F	4,385	Any month	Any month
Silverton	8b	15°F to 20°F	408	Mar 28	Nov 10
Squaw Butte-northern Great Bas	6a	−10°F to −5°F	4,660	Jun 11	Sep 28
Stayton	8b	15°F to 20°F	425	Mar 29	Nov 6
Sunriver	6a	−10°F to −5°F	4,180	Any month	Any month
The Dalles	7b	5°F to 10°F	150	Apr 14	Oct 23
Tillamook	9a	20°F to 25°F	12	Apr 22	Oct 21
Tillamook 6SE	9a	20°F to 25°F	140	Apr 5	Nov 4
Toketee Falls	8b	15°F to 20°F	2,060	Apr 29	Oct 18
Troutdale	9a	20°F to 25°F	33	Mar 26	Nov 17
Vale	7a	0°F to 5°F	2,240	May 8	Sep 29
Vernonia #2	8a	10°F to 15°F	625	May 8	Oct 1
Wallowa	6b	−5°F to 0°F	2,923	Jun 7	Sep 9
Westfall	6a	−10°F to −5°F	3,040	May 7	Oct 3
Winchester	8b	15°F to 20°F	460	Mar 31	Nov 5
Winchester Bay Coast Grd	9a	20°F to 25°F	8	Mar 25	Nov 24
Yachats	9a	20°F to 25°F	50	Feb 19	Dec 11

Frequently asked questions

What hardiness zone is Oregon?

Oregon is in USDA hardiness zones 5b–9b on the 2023 USDA Plant Hardiness Zone Map. Zone 8b is the most common, covering 40% of Oregon's ZIP codes, and zone 9a covers 24%. Enter your ZIP code for your exact zone.

What does zone 8b mean?

Zone 8b means the average annual extreme minimum temperature, the coldest night of a typical winter, is 15°F to 20°F (−9°C to −7°C). Perennials, shrubs and trees rated for zone 8b or colder should survive winter there.

What is the coldest hardiness zone in Oregon?

Zone 5b is the coldest zone mapped in Oregon, found around Seneca, and zone 9b is the warmest, found around Newport 1 SE.

Did Oregon's hardiness zones change in 2023?

The USDA released a new Plant Hardiness Zone Map in November 2023, based on 1991–2020 temperatures instead of 1976–2005. About half of the United States shifted half a zone warmer. Check your ZIP code here, because plant tags and older books may still list your 2012 zone.

When should I plant in zone 8b?

Hardiness zones don't set planting dates; frost dates do. Inside zone 8b in Oregon, the median last spring frost varies from February 25 to May 16. Look up your local frost dates and plant tender crops such as tomatoes after the 10%-risk last-frost date.

Zone and frost dates: use both

Your hardiness zone answers one question: will this plant survive the winter here? Choose perennials, shrubs, trees and bulbs rated for your zone or a colder one. For vegetables and annuals, what matters is the length of the frost-free season. See Oregon frost dates by town, or get a planting calendar for your ZIP code with start-indoors, transplant and sowing dates for 30 crops.

Sources and method

Zones are from the USDA 2023 Plant Hardiness Zone Map ZIP-code files published by the PRISM Climate Group, Oregon State University, based on 1991–2020 minimum temperatures. ZIP codes are assigned to states by USPS prefix. Town zones use the ZIP code nearest each NOAA 1991–2020 Climate Normals station. This is an independent tool, not an official USDA site. Full methodology.