What Hardiness Zone Is Ohio?

USDA 2023 Plant Hardiness Zone Map · 1,391 ZIP codes · Data updated 2026-10-28

Quick answer

Ohio spans USDA hardiness zones 6a–7a on the 2023 Plant Hardiness Zone Map. The most common zone is 6b, covering 56% of Ohio's ZIP codes, followed by zone 6a (39%). Zone 6b means the coldest night of an average winter reaches −5°F to 0°F (−21°C to −18°C). Enter your ZIP code for your exact zone.

Ohio hardiness zones by share of ZIP codes

Zone 6a39% · 544 ZIPs

Zone 6b56% · 784 ZIPs

Zone 7a5% · 63 ZIPs

What the zones mean for Ohio gardeners

Coldest and warmest towns: among towns with NOAA weather stations, Mansfield 5 W (1,350 ft) is in zone 6a, while Portsmouth-sciotoville (540 ft) is in zone 7a. That is a difference of about 10°F in the coldest night of a typical winter.
Same zone, different frost dates: within zone 6b, the median last spring frost ranges from April 10 at Sandusky to April 30 at Stow 4 SE, 20 days apart. Your zone tells you which perennials survive winter; your frost dates tell you when to plant.

Typical frost dates in each Ohio 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	April 26	October 20	59
6b	April 22	October 23	65
7a	April 16	November 2	4

Hardiness zones for Ohio cities

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


Akron Canton Regional Airport	6b	−5°F to 0°F	1,208	Apr 24	Oct 26
Akron Fulton Intl Airport	6b	−5°F to 0°F	1,044	Apr 24	Oct 28
Ashtabula County Airport	6a	−10°F to −5°F	924	May 2	Oct 21
Cincinnati	6b	−5°F to 0°F	1,056	Apr 19	Oct 22
Cincinnati Lunken Airport	6b	−5°F to 0°F	490	Apr 16	Oct 25
Cleveland	6b	−5°F to 0°F	763	Apr 20	Nov 3
Cleveland Burke Airport	7a	0°F to 5°F	584	Apr 8	Nov 12
Columbus Ohio State University Airport	6b	−5°F to 0°F	905	Apr 22	Oct 23
Columbus Port Columbus Intl Airport	6b	−5°F to 0°F	810	Apr 18	Oct 27
Dayton Intl Airport	6b	−5°F to 0°F	1,000	Apr 16	Oct 28
Dayton Wright Bros Airport	6b	−5°F to 0°F	962	Apr 17	Oct 26
Defiance Memorial Airport	6a	−10°F to −5°F	708	Apr 28	Oct 17
Elyria Lorain County Airport	6b	−5°F to 0°F	794	Apr 24	Oct 24
Findlay Airport	6b	−5°F to 0°F	800	Apr 19	Oct 23
Hamilton Butler County Regional Airport	6b	−5°F to 0°F	634	Apr 22	Oct 18
Lancaster Fairfield Airport	6b	−5°F to 0°F	869	Apr 26	Oct 13
Lima Allen County Airport	6a	−10°F to −5°F	975	Apr 22	Oct 22
Mansfield Lahm Municipal Airport	6a	−10°F to −5°F	1,295	Apr 26	Oct 22
Marion Municipal Airport	6a	−10°F to −5°F	994	Apr 24	Oct 20
New Philadelphia Field	6b	−5°F to 0°F	895	Apr 26	Oct 21
Newark Heath Airport	6a	−10°F to −5°F	884	Apr 22	Oct 18
Sandusky	6b	−5°F to 0°F	584	Apr 10	Nov 5
Toledo Express Airport	6b	−5°F to 0°F	669	Apr 22	Oct 24
Toledo Metcalf Field	6b	−5°F to 0°F	622	Apr 20	Oct 27
Wooster 3 SSE	6a	−10°F to −5°F	1,102	Apr 24	Oct 21
Wooster Wayne County Airport	6a	−10°F to −5°F	1,137	Apr 29	Oct 14
Youngstown Regional Airport	6a	−10°F to −5°F	1,180	May 1	Oct 17
Zanesville Municipal Airport	6b	−5°F to 0°F	880	Apr 26	Oct 19

Hardiness zones for 128 towns in Ohio

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


Akron Canton Regional Airport	6b	−5°F to 0°F	1,208	Apr 24	Oct 26
Akron Fulton Intl Airport	6b	−5°F to 0°F	1,044	Apr 24	Oct 28
Ashland 2 SW	6a	−10°F to −5°F	1,265	Apr 30	Oct 15
Ashtabula County Airport	6a	−10°F to −5°F	924	May 2	Oct 21
Athens Ou	6b	−5°F to 0°F	684	Apr 25	Oct 23
Barnesville	6b	−5°F to 0°F	1,280	Apr 27	Oct 22
Bellefontaine	6a	−10°F to −5°F	1,176	Apr 26	Oct 20
Beverly Stp	6b	−5°F to 0°F	624	Apr 24	Oct 22
Bowling Green Wwtp	6b	−5°F to 0°F	675	Apr 22	Oct 25
Bryan 2 SE	6a	−10°F to −5°F	730	Apr 26	Oct 17
Bucyrus	6a	−10°F to −5°F	955	Apr 19	Oct 27
Cadiz	6b	−5°F to 0°F	1,260	Apr 21	Oct 25
Caldwell 3SE	6b	−5°F to 0°F	880	Apr 30	Oct 14
Cambridge	6b	−5°F to 0°F	800	Apr 28	Oct 17
Carpenter 2 S	6b	−5°F to 0°F	822	Apr 27	Oct 14
Celina 3 NE	6a	−10°F to −5°F	866	Apr 27	Oct 19
Centerburg 2 SE	6a	−10°F to −5°F	1,205	Apr 27	Oct 17
Chardon	6a	−10°F to −5°F	1,130	May 5	Oct 18
Cheviot	6b	−5°F to 0°F	891	Apr 17	Oct 26
Cheviot 3 W	6b	−5°F to 0°F	853	Apr 16	Oct 28
Chillicothe Mound City	6b	−5°F to 0°F	650	Apr 20	Oct 22
Chilo Meldahl Locks & Dam	6b	−5°F to 0°F	480	Apr 16	Oct 31
Chippewa Lake	6a	−10°F to −5°F	1,180	Apr 29	Oct 19
Cincinnati	6b	−5°F to 0°F	1,056	Apr 19	Oct 22
Cincinnati Lunken Airport	6b	−5°F to 0°F	490	Apr 16	Oct 25
Cincinnati-fernbank	6b	−5°F to 0°F	500	Apr 13	Oct 31
Circleville	6b	−5°F to 0°F	675	Apr 17	Oct 28
Cleveland	6b	−5°F to 0°F	763	Apr 20	Nov 3
Cleveland Burke Airport	7a	0°F to 5°F	584	Apr 8	Nov 12
Columbus Ohio State University Airport	6b	−5°F to 0°F	905	Apr 22	Oct 23
Columbus Port Columbus Intl Airport	6b	−5°F to 0°F	810	Apr 18	Oct 27
Columbus Wcmh	6b	−5°F to 0°F	740	Apr 20	Oct 24
Columbus-valley Crossing	6b	−5°F to 0°F	760	Apr 23	Oct 19
Coshocton Agricultural Rsch Station	6b	−5°F to 0°F	1,140	Apr 18	Oct 28
Coshocton Wpc Plt	6b	−5°F to 0°F	760	Apr 27	Oct 18
Danville 2 W	6a	−10°F to −5°F	970	May 2	Oct 8
Dayton Intl Airport	6b	−5°F to 0°F	1,000	Apr 16	Oct 28
Dayton McD	6b	−5°F to 0°F	720	Apr 18	Oct 25
Dayton Wright Bros Airport	6b	−5°F to 0°F	962	Apr 17	Oct 26
Defiance	6a	−10°F to −5°F	700	Apr 22	Oct 24
Defiance Memorial Airport	6a	−10°F to −5°F	708	Apr 28	Oct 17
Dennison Wtr Wks	6b	−5°F to 0°F	860	Apr 29	Oct 15
Dorset	6a	−10°F to −5°F	980	May 10	Oct 10
Eaton	6a	−10°F to −5°F	1,002	Apr 25	Oct 20
Elyria 3 E	6b	−5°F to 0°F	730	Apr 22	Nov 1
Elyria Lorain County Airport	6b	−5°F to 0°F	794	Apr 24	Oct 24
Fairfield	6b	−5°F to 0°F	575	Apr 19	Oct 22
Findlay Airport	6b	−5°F to 0°F	800	Apr 19	Oct 23
Findlay Wpcc	6a	−10°F to −5°F	768	Apr 22	Oct 24
Franklin	6b	−5°F to 0°F	679	Apr 24	Oct 19
Fredericktown 4 S	6a	−10°F to −5°F	1,050	May 1	Oct 10
Fremont	6b	−5°F to 0°F	600	Apr 26	Oct 23
Fremont Agricultural Station	6a	−10°F to −5°F	664	Apr 21	Oct 24
Galion Wtr Wks	6a	−10°F to −5°F	1,170	Apr 26	Oct 20
Gallipolis	6b	−5°F to 0°F	578	Apr 18	Oct 28
Greenville Wtp	6a	−10°F to −5°F	1,030	Apr 21	Oct 20
Hamilton Butler County Regional Airport	6b	−5°F to 0°F	634	Apr 22	Oct 18
Hannibal Locks & Dam	6b	−5°F to 0°F	620	Apr 26	Oct 26
Hicksville	6a	−10°F to −5°F	750	Apr 28	Oct 17
Hillsboro	6b	−5°F to 0°F	953	Apr 24	Oct 20
Hiram	6a	−10°F to −5°F	1,230	May 1	Oct 20
Hoytville 2 NE	6a	−10°F to −5°F	700	Apr 24	Oct 21
Huntsville 3N	6a	−10°F to −5°F	1,034	Apr 22	Oct 27
Jackson 3 NW	6b	−5°F to 0°F	845	Apr 22	Oct 21
Kenton	6a	−10°F to −5°F	997	Apr 22	Oct 24
Kirtland-holden 2	6b	−5°F to 0°F	1,030	Apr 26	Oct 31
Lancaster	6a	−10°F to −5°F	827	Apr 22	Oct 24
Lancaster Fairfield Airport	6b	−5°F to 0°F	869	Apr 26	Oct 13
Lima Allen County Airport	6a	−10°F to −5°F	975	Apr 22	Oct 22
Lima Wwtp	6a	−10°F to −5°F	850	Apr 24	Oct 24
Logan	6b	−5°F to 0°F	722	Apr 30	Oct 14
London Fish Hatchery	6a	−10°F to −5°F	1,120	Apr 24	Oct 18
Lucasville	6b	−5°F to 0°F	568	Apr 21	Oct 24
Mansfield 5 W	6a	−10°F to −5°F	1,350	Apr 30	Oct 15
Mansfield Lahm Municipal Airport	6a	−10°F to −5°F	1,295	Apr 26	Oct 22
Marietta Wwtp	6b	−5°F to 0°F	610	Apr 18	Oct 27
Marion 2 N	6a	−10°F to −5°F	965	Apr 25	Oct 20
Marion Municipal Airport	6a	−10°F to −5°F	994	Apr 24	Oct 20
Marysville	6a	−10°F to −5°F	970	Apr 19	Oct 26
Mc Connellsville Lake 7	6b	−5°F to 0°F	760	Apr 27	Oct 21
Milford	6b	−5°F to 0°F	520	Apr 23	Oct 18
Millersburg	6a	−10°F to −5°F	819	May 2	Oct 14
Millport 4 NE	6a	−10°F to −5°F	1,170	May 2	Oct 13
Montpelier	6a	−10°F to −5°F	860	Apr 28	Oct 18
Mosquito Creek Lake	6a	−10°F to −5°F	910	Apr 30	Oct 23
Napoleon	6a	−10°F to −5°F	682	Apr 24	Oct 21
Napoleon 1SW	6a	−10°F to −5°F	670	Apr 23	Oct 24
New Carlisle	6a	−10°F to −5°F	874	Apr 24	Oct 17
New Lexington 2 NW	6a	−10°F to −5°F	877	Apr 30	Oct 17
New Philadelphia	6b	−5°F to 0°F	925	Apr 30	Oct 15
New Philadelphia Field	6b	−5°F to 0°F	895	Apr 26	Oct 21
Newark Heath Airport	6a	−10°F to −5°F	884	Apr 22	Oct 18
Newark Wtr Wks	6a	−10°F to −5°F	835	Apr 29	Oct 16
Newport	6b	−5°F to 0°F	676	Apr 23	Oct 26
Norwalk Wwtp	6b	−5°F to 0°F	670	Apr 25	Oct 25
Oberlin	6b	−5°F to 0°F	816	Apr 27	Oct 22
Painesville 4 NW	7a	0°F to 5°F	600	Apr 15	Nov 9
Pandora	6a	−10°F to −5°F	770	Apr 23	Oct 22
Paulding	6a	−10°F to −5°F	725	Apr 25	Oct 19
Philo 3 SW	6b	−5°F to 0°F	1,020	Apr 19	Oct 25
Piqua Wwtp	6a	−10°F to −5°F	853	Apr 18	Oct 23
Portsmouth-sciotoville	7a	0°F to 5°F	540	Apr 17	Oct 25
Ravenna 2 S	6a	−10°F to −5°F	1,107	Apr 21	Oct 29
Ripley Experiment Farm	6b	−5°F to 0°F	880	Apr 29	Oct 11
Sandusky	6b	−5°F to 0°F	584	Apr 10	Nov 5
Sidney 1 S	6a	−10°F to −5°F	940	Apr 27	Oct 20
Springfield Wtp	6a	−10°F to −5°F	951	Apr 25	Oct 19
Steubenville	6b	−5°F to 0°F	992	Apr 29	Oct 20
Stow 4 SE	6b	−5°F to 0°F	1,060	Apr 30	Oct 21
Tiffin	6a	−10°F to −5°F	740	Apr 23	Oct 23
Toledo Express Airport	6b	−5°F to 0°F	669	Apr 22	Oct 24
Toledo Metcalf Field	6b	−5°F to 0°F	622	Apr 20	Oct 27
Upper Sandusky	6a	−10°F to −5°F	854	Apr 29	Oct 17
Urbana Wwtp	6a	−10°F to −5°F	1,019	Apr 24	Oct 19
Van Wert 1 S	6a	−10°F to −5°F	790	Apr 21	Oct 26
Warren 3 S	6a	−10°F to −5°F	900	May 8	Oct 12
Washington Court House	6b	−5°F to 0°F	957	Apr 23	Oct 21
Waterloo	7a	0°F to 5°F	625	Apr 30	Oct 15
Wauseon Wtp	6a	−10°F to −5°F	750	Apr 29	Oct 16
Waverly	6b	−5°F to 0°F	572	Apr 21	Oct 22
Westerville	6b	−5°F to 0°F	802	Apr 22	Oct 24
Wilmington 3 N	6b	−5°F to 0°F	1,033	Apr 20	Oct 20
Wooster 3 SSE	6a	−10°F to −5°F	1,102	Apr 24	Oct 21
Wooster Experiment Station	6a	−10°F to −5°F	1,020	Apr 30	Oct 12
Wooster Wayne County Airport	6a	−10°F to −5°F	1,137	Apr 29	Oct 14
Xenia 6 SSE	6b	−5°F to 0°F	997	Apr 18	Oct 24
Youngstown Regional Airport	6a	−10°F to −5°F	1,180	May 1	Oct 17
Zanesville Municipal Airport	6b	−5°F to 0°F	880	Apr 26	Oct 19

Frequently asked questions

What hardiness zone is Ohio?

Ohio is in USDA hardiness zones 6a–7a on the 2023 USDA Plant Hardiness Zone Map. Zone 6b is the most common, covering 56% of Ohio's ZIP codes, and zone 6a covers 39%. Enter your ZIP code for your exact zone.

What does zone 6b mean?

Zone 6b means the average annual extreme minimum temperature, the coldest night of a typical winter, is −5°F to 0°F (−21°C to −18°C). Perennials, shrubs and trees rated for zone 6b or colder should survive winter there.

What is the coldest hardiness zone in Ohio?

Zone 6a is the coldest zone mapped in Ohio, found around Mansfield 5 W, and zone 7a is the warmest, found around Portsmouth-sciotoville.

Did Ohio'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 6b?

Hardiness zones don't set planting dates; frost dates do. Inside zone 6b in Ohio, the median last spring frost varies from April 10 to April 30. 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 Ohio 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.