What Hardiness Zone Is Indiana?

USDA 2023 Plant Hardiness Zone Map · 929 ZIP codes · Data updated 2026-10-28

Quick answer

Indiana spans USDA hardiness zones 5b–7a on the 2023 Plant Hardiness Zone Map. The most common zone is 6a, covering 61% of Indiana's ZIP codes, followed by zone 6b (24%). Zone 6a means the coldest night of an average winter reaches −10°F to −5°F (−23°C to −21°C). Enter your ZIP code for your exact zone.

Indiana hardiness zones by share of ZIP codes

Zone 5b5% · 45 ZIPs

Zone 6a61% · 567 ZIPs

Zone 6b24% · 226 ZIPs

Zone 7a10% · 91 ZIPs

What the zones mean for Indiana gardeners

Coldest and warmest towns: among towns with NOAA weather stations, Wanatah 2 WNW (735 ft) is in zone 5b, while Jt Myers Locks & Dam (340 ft) is in zone 7a. That is a difference of about 15°F in the coldest night of a typical winter.
Same zone, different frost dates: within zone 6a, the median last spring frost ranges from April 12 at Indianapolis Eagle Creek Airport to May 2 at Garrett 1 S, 20 days apart. Your zone tells you which perennials survive winter; your frost dates tell you when to plant.

Typical frost dates in each Indiana 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
5b	April 26	October 17	7
6a	April 23	October 20	70
6b	April 15	October 25	31
7a	April 5	October 31	9

Hardiness zones for Indiana cities

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


Bedford 5 WNW	6b	−5°F to 0°F	760	Apr 10	Oct 30
Bloomington Monroe County Airport	6b	−5°F to 0°F	844	Apr 17	Oct 22
Evansville Regional Airport	7a	0°F to 5°F	400	Apr 4	Oct 29
Fort Wayne Intl Airport	6a	−10°F to −5°F	791	Apr 24	Oct 21
Goshen Municipal Airport	6a	−10°F to −5°F	827	Apr 28	Oct 19
Indianapolis	6b	−5°F to 0°F	790	Apr 15	Oct 26
Indianapolis Eagle Creek Airport	6a	−10°F to −5°F	823	Apr 12	Oct 29
Lafayette Purdue University Airport	6a	−10°F to −5°F	599	Apr 26	Oct 18
Muncie Delaware County Airport	6a	−10°F to −5°F	937	Apr 16	Oct 25
Shelbyville Municipal Airport	6a	−10°F to −5°F	804	Apr 14	Oct 23
South Bend Michiana Regional Airport	6a	−10°F to −5°F	773	May 1	Oct 19
Terre Haute CAA Airport	6a	−10°F to −5°F	575	Apr 14	Oct 24
Terre Haute Hulman Regional Airport	6a	−10°F to −5°F	575	Apr 16	Oct 18
Valparaiso Porter County Municipal Airport	6a	−10°F to −5°F	770	Apr 20	Oct 26

Hardiness zones for 117 towns in Indiana

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.

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Anderson Sewage Plt	6a	−10°F to −5°F	841	Apr 19	Oct 23
Angola	6a	−10°F to −5°F	1,020	Apr 30	Oct 16
Attica 2E	6a	−10°F to −5°F	727	Apr 22	Oct 17
Bedford 5 WNW	6b	−5°F to 0°F	760	Apr 10	Oct 30
Berne Wwtp	6a	−10°F to −5°F	839	Apr 23	Oct 22
Bloomington Indiana University	6b	−5°F to 0°F	830	Apr 15	Oct 26
Bloomington Monroe County Airport	6b	−5°F to 0°F	844	Apr 17	Oct 22
Bluffton 6N	6a	−10°F to −5°F	861	Apr 24	Oct 20
Boonville 1S	7a	0°F to 5°F	400	Apr 12	Oct 25
Boswell 4WNW	6a	−10°F to −5°F	772	Apr 25	Oct 13
Brookville	6a	−10°F to −5°F	630	Apr 20	Oct 21
Cambridge City 3 N	6a	−10°F to −5°F	1,000	Apr 27	Oct 9
Cannelton	7a	0°F to 5°F	402	Apr 2	Nov 7
Carmel 3 E	6a	−10°F to −5°F	752	Apr 21	Oct 21
Castleton 2 S	6a	−10°F to −5°F	824	Apr 18	Oct 26
Chalmers 5 W	6a	−10°F to −5°F	720	Apr 25	Oct 17
Columbia City	6a	−10°F to −5°F	834	Apr 27	Oct 17
Columbus	6b	−5°F to 0°F	609	Apr 11	Oct 25
Crane Nsa	6b	−5°F to 0°F	730	Apr 9	Oct 31
Crawfordsville 6 SE	6a	−10°F to −5°F	836	Apr 27	Oct 12
Decatur 1 N	6a	−10°F to −5°F	785	Apr 23	Oct 19
Delphi 2 N	6a	−10°F to −5°F	556	Apr 22	Oct 17
Dubois S In Forage Fm	6b	−5°F to 0°F	690	Apr 25	Oct 15
Elnora	6b	−5°F to 0°F	480	Apr 9	Oct 25
Elwood	6a	−10°F to −5°F	866	Apr 24	Oct 18
English	6b	−5°F to 0°F	510	Apr 17	Oct 19
Evansville Museum	7a	0°F to 5°F	374	Mar 29	Nov 10
Evansville Regional Airport	7a	0°F to 5°F	400	Apr 4	Oct 29
Farmersburg Tv-2	6b	−5°F to 0°F	548	Apr 8	Oct 27
Farmland 5 NNW	6a	−10°F to −5°F	965	Apr 25	Oct 16
Fort Wayne Intl Airport	6a	−10°F to −5°F	791	Apr 24	Oct 21
Francesville	5b	−15°F to −10°F	680	Apr 26	Oct 17
Frankfort Disposal	6a	−10°F to −5°F	824	Apr 21	Oct 21
Franklin Wwtp	6b	−5°F to 0°F	720	Apr 20	Oct 19
Freelandville	6b	−5°F to 0°F	550	Apr 9	Oct 30
Garrett	6a	−10°F to −5°F	880	Apr 29	Oct 17
Garrett 1 S	6a	−10°F to −5°F	870	May 2	Oct 10
Goshen 3SW	6a	−10°F to −5°F	875	Apr 26	Oct 21
Goshen Municipal Airport	6a	−10°F to −5°F	827	Apr 28	Oct 19
Greencastle 1 W	6a	−10°F to −5°F	735	Apr 27	Oct 15
Greenfield	6a	−10°F to −5°F	869	Apr 19	Oct 22
Greensburg	6b	−5°F to 0°F	937	Apr 15	Oct 26
Hartford City 4 ESE	6a	−10°F to −5°F	924	Apr 22	Oct 22
Huntington	6a	−10°F to −5°F	725	May 1	Oct 14
Indiana Dunes Nl	6a	−10°F to −5°F	680	Apr 22	Oct 27
Indianapolis	6b	−5°F to 0°F	790	Apr 15	Oct 26
Indianapolis Eagle Creek Airport	6a	−10°F to −5°F	823	Apr 12	Oct 29
Indianapolis Nwfo	6b	−5°F to 0°F	790	Apr 12	Oct 27
Indianapolis SE Side	6b	−5°F to 0°F	845	Apr 20	Oct 21
Jamestown 2 E	6a	−10°F to −5°F	962	Apr 23	Oct 19
Jt Myers Locks & Dam	7a	0°F to 5°F	340	Apr 5	Oct 31
Kentland	5b	−15°F to −10°F	695	Apr 23	Oct 14
Knox Wwtp	5b	−15°F to −10°F	690	Apr 26	Oct 19
Kokomo 3 WSW	6a	−10°F to −5°F	822	Apr 27	Oct 18
Lafayette 8 S	6a	−10°F to −5°F	732	Apr 20	Oct 20
Lafayette Purdue University Airport	6a	−10°F to −5°F	599	Apr 26	Oct 18
Lagrange	6a	−10°F to −5°F	900	Apr 26	Oct 21
Lakeville	6a	−10°F to −5°F	841	May 1	Oct 13
Laporte	6a	−10°F to −5°F	809	Apr 19	Oct 27
Logansport Cicott St	6a	−10°F to −5°F	600	Apr 20	Oct 23
Lowell	5b	−15°F to −10°F	665	Apr 29	Oct 16
Madison Sewage Plt	6b	−5°F to 0°F	460	Apr 11	Oct 31
Marion 2 N	6a	−10°F to −5°F	790	Apr 26	Oct 20
Martinsville 2 SW	6a	−10°F to −5°F	592	Apr 24	Oct 15
Milan 5 NE	6b	−5°F to 0°F	975	Apr 30	Oct 16
Mount Vernon	7a	0°F to 5°F	357	Apr 7	Oct 28
Muncie Delaware County Airport	6a	−10°F to −5°F	937	Apr 16	Oct 25
N Manchester Wwtp	6a	−10°F to −5°F	760	Apr 26	Oct 19
N Vernon 2 ESE	6b	−5°F to 0°F	743	Apr 21	Oct 21
New Castle 3 SW	6a	−10°F to −5°F	991	Apr 27	Oct 17
Newburgh L&d	7a	0°F to 5°F	380	Apr 3	Nov 2
Northern Indiana WFO	6a	−10°F to −5°F	951	Apr 24	Oct 24
Oolitic Purdue Ex Fm	6b	−5°F to 0°F	652	Apr 20	Oct 20
Paoli	6b	−5°F to 0°F	560	Apr 21	Oct 18
Patoka Lake	6b	−5°F to 0°F	561	Apr 10	Nov 1
Perrysville 4 WNW	6a	−10°F to −5°F	611	Apr 23	Oct 14
Petersburg 61 Brg	6b	−5°F to 0°F	472	Apr 20	Oct 22
Plymouth	6a	−10°F to −5°F	815	Apr 25	Oct 21
Portland 1 SW	6a	−10°F to −5°F	910	Apr 28	Oct 15
Princeton 1 W	6b	−5°F to 0°F	480	Apr 13	Oct 25
Rensselaer	6a	−10°F to −5°F	630	Apr 23	Oct 18
Richmond Wtr Wks	6a	−10°F to −5°F	1,005	Apr 24	Oct 20
Rochester	6a	−10°F to −5°F	760	Apr 23	Oct 21
Rockville	6a	−10°F to −5°F	689	Apr 30	Oct 12
Rushville	6a	−10°F to −5°F	948	Apr 19	Oct 23
S Bend	6a	−10°F to −5°F	710	Apr 23	Oct 23
Saint Meinrad	6b	−5°F to 0°F	510	Apr 11	Oct 26
Salem	6b	−5°F to 0°F	785	Apr 17	Oct 22
Scottsburg	6b	−5°F to 0°F	570	Apr 18	Oct 20
Seymour 2 N	6b	−5°F to 0°F	570	Apr 16	Oct 21
Shakamak State Park	6a	−10°F to −5°F	549	Apr 14	Oct 26
Shelbyville Municipal Airport	6a	−10°F to −5°F	804	Apr 14	Oct 23
Shelbyville Sewage Plt	6a	−10°F to −5°F	752	Apr 17	Oct 22
Shoals 8 S	6b	−5°F to 0°F	477	Apr 15	Oct 23
South Bend Michiana Regional Airport	6a	−10°F to −5°F	773	May 1	Oct 19
Spencer	6a	−10°F to −5°F	549	Apr 20	Oct 20
Stendal	7a	0°F to 5°F	635	Apr 6	Oct 30
Tell City	7a	0°F to 5°F	390	Apr 5	Nov 1
Terre Haute CAA Airport	6a	−10°F to −5°F	575	Apr 14	Oct 24
Terre Haute Hulman Regional Airport	6a	−10°F to −5°F	575	Apr 16	Oct 18
Terre Haute Indiana State	6a	−10°F to −5°F	507	Apr 15	Oct 19
Tipton 5 SW	6a	−10°F to −5°F	890	Apr 23	Oct 17
Valparaiso Porter County Municipal Airport	6a	−10°F to −5°F	770	Apr 20	Oct 26
Valparaiso Wtr Wks	6a	−10°F to −5°F	800	Apr 22	Oct 25
Vevay	6b	−5°F to 0°F	495	Apr 9	Nov 1
Vincennes 5 NE	6b	−5°F to 0°F	452	Apr 11	Oct 26
W Lafayette 6 NW	6a	−10°F to −5°F	708	Apr 26	Oct 12
Wabash	6a	−10°F to −5°F	665	Apr 23	Oct 21
Wanatah 2 WNW	5b	−15°F to −10°F	735	Apr 29	Oct 13
Warsaw	6a	−10°F to −5°F	815	Apr 28	Oct 18
Washington 1 W	6b	−5°F to 0°F	482	Apr 10	Oct 25
Wheatfield	5b	−15°F to −10°F	665	Apr 25	Oct 17
Whitestown	6a	−10°F to −5°F	941	Apr 21	Oct 20
Winamac 2SSE	5b	−15°F to −10°F	690	Apr 25	Oct 18
Winchester Airport 3 E	6a	−10°F to −5°F	1,110	Apr 20	Oct 21
Woodburn 3N	6a	−10°F to −5°F	710	Apr 27	Oct 19
Young America	6a	−10°F to −5°F	773	Apr 25	Oct 17

Frequently asked questions

What hardiness zone is Indiana?

Indiana is in USDA hardiness zones 5b–7a on the 2023 USDA Plant Hardiness Zone Map. Zone 6a is the most common, covering 61% of Indiana's ZIP codes, and zone 6b covers 24%. Enter your ZIP code for your exact zone.

What does zone 6a mean?

Zone 6a means the average annual extreme minimum temperature, the coldest night of a typical winter, is −10°F to −5°F (−23°C to −21°C). Perennials, shrubs and trees rated for zone 6a or colder should survive winter there.

What is the coldest hardiness zone in Indiana?

Zone 5b is the coldest zone mapped in Indiana, found around Wanatah 2 WNW, and zone 7a is the warmest, found around Jt Myers Locks & Dam.

Did Indiana'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 6a?

Hardiness zones don't set planting dates; frost dates do. Inside zone 6a in Indiana, the median last spring frost varies from April 12 to May 2. 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 Indiana 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.