USDA hardiness zone 6a

In zone 6a the average coldest winter night reaches -10°F to -5°F. Plants labeled for zone 6 (or a colder zone) can survive the winter outdoors here. 443 U.S. cities with 10,000+ residents are in this zone — the largest are listed below.

City	State	Zone	Avg. last frost	Avg. first frost
Denver	CO	6a	Apr 30	Oct 12
Milwaukee	WI	6a	Apr 26	Oct 22
Omaha	NE	6a	Apr 18	Oct 21
Colorado Springs	CO	6a	May 3	Oct 8
Aurora	CO	6a	May 4	Oct 8
Lincoln	NE	6a	Apr 24	Oct 13
Fort Wayne	IN	6a	Apr 24	Oct 21
Worcester	MA	6a	Apr 23	Oct 21
Grand Rapids	MI	6a	May 6	Oct 10
Lakewood	CO	6a	May 3	Oct 7
Joliet	IL	6a	Apr 19	Oct 25
Syracuse	NY	6a	Apr 29	Oct 19
Thornton	CO	6a	May 2	Oct 11
Ann Arbor	MI	6a	May 5	Oct 10
Westminster	CO	6a	May 2	Oct 11
Arvada	CO	6a	May 5	Oct 5
Peoria	IL	6a	Apr 16	Oct 23
Springfield	IL	6a	Apr 15	Oct 22
North Peoria	IL	6a	Apr 16	Oct 23
Lansing	MI	6a	May 1	Oct 13
Manchester	NH	6a	Apr 30	Oct 11
Centennial	CO	6a	May 5	Oct 8
Pueblo	CO	6a	Apr 30	Oct 9
Boulder	CO	6a	May 6	Oct 5
South Bend	IN	6a	Apr 23	Oct 23
Albany	NY	6a	Apr 27	Oct 15
Kenosha	WI	6a	Apr 19	Oct 26
Flint	MI	6a	May 6	Oct 10
Highlands Ranch	CO	6a	May 5	Oct 8
West Albany	NY	6a	Apr 27	Oct 15
Carmel	IN	6a	Apr 21	Oct 21
Waukegan	IL	6a	Apr 30	Oct 19
Nashua	NH	6a	Apr 30	Oct 12
Champaign	IL	6a	Apr 15	Oct 24
Cicero	IL	6a	Apr 11	Oct 31
Bloomington	IL	6a	Apr 21	Oct 20
Racine	WI	6a	Apr 20	Oct 24
Hammond	IN	6a	Apr 23	Oct 20
Gary	IN	6a	Apr 22	Oct 27
Fishers	IN	6a	Apr 21	Oct 21
Saint Joseph	MO	6a	Apr 19	Oct 17
Kalamazoo	MI	6a	Apr 28	Oct 18
Arlington Heights	IL	6a	Apr 19	Oct 26
Waterford	MI	6a	Apr 29	Oct 20
Evanston	IL	6a	Apr 26	Oct 21
Wyoming	MI	6a	May 6	Oct 10
Bolingbrook	IL	6a	Apr 20	Oct 22
Rochester Hills	MI	6a	Apr 26	Oct 22
Decatur	IL	6a	Apr 14	Oct 24
Lafayette	IN	6a	Apr 26	Oct 18
Flagstaff	AZ	6a	Jun 4	Sep 28
Muncie	IN	6a	Apr 16	Oct 25
Portland	ME	6a	Apr 26	Oct 15
Schenectady	NY	6a	Apr 27	Oct 15
Broomfield	CO	6a	May 2	Oct 11
Skokie	IL	6a	Apr 26	Oct 21
West Bloomfield Township	MI	6a	Apr 29	Oct 20
Youngstown	OH	6a	May 1	Oct 17
Haverhill	MA	6a	May 1	Oct 12
Council Bluffs	IA	6a	Apr 18	Oct 21
Terre Haute	IN	6a	Apr 15	Oct 19
Pontiac	MI	6a	Apr 26	Oct 22
Springfield	OH	6a	Apr 25	Oct 19
Noblesville	IN	6a	Apr 21	Oct 21
Novi	MI	6a	May 1	Oct 17
Des Plaines	IL	6a	Apr 16	Oct 28
Orland Park	IL	6a	Apr 19	Oct 22
Kokomo	IN	6a	Apr 27	Oct 18
Tinley Park	IL	6a	Apr 23	Oct 20
Oak Lawn	IL	6a	Apr 10	Nov 1
Chicopee	MA	6a	May 3	Oct 8
Berwyn	IL	6a	Apr 11	Oct 31
Manhattan	KS	6a	Apr 16	Oct 19
Greenwood	IN	6a	Apr 20	Oct 21
Anderson	IN	6a	Apr 19	Oct 23
North Chicopee	MA	6a	May 3	Oct 8
Mount Prospect	IL	6a	Apr 19	Oct 26
Pocatello	ID	6a	May 2	Oct 11
Normal	IL	6a	Apr 25	Oct 16
Commerce City	CO	6a	May 4	Oct 8
Elkhart	IN	6a	Apr 26	Oct 21
Oak Park	IL	6a	Apr 11	Oct 31
Battle Creek	MI	6a	Apr 30	Oct 19
Kentwood	MI	6a	May 6	Oct 10
Logan	UT	6a	May 8	Oct 2
Troy	NY	6a	Apr 19	Oct 26
Downers Grove	IL	6a	Apr 28	Oct 16
Saginaw	MI	6a	Apr 29	Oct 21
Sheboygan	WI	6a	Apr 25	Oct 23
East Lansing	MI	6a	Apr 28	Oct 17
Mishawaka	IN	6a	Apr 23	Oct 23
Portage	MI	6a	Apr 28	Oct 18
Newark	OH	6a	Apr 29	Oct 16
Lawrence	IN	6a	Apr 18	Oct 26
Glenview	IL	6a	Apr 26	Oct 21
Mansfield	OH	6a	Apr 26	Oct 22
Littleton	CO	6a	May 2	Oct 11
Binghamton	NY	6a	May 2	Oct 11
Elmhurst	IL	6a	Apr 16	Oct 28
West Lafayette	IN	6a	Apr 26	Oct 18
Lombard	IL	6a	Apr 28	Oct 16
Urbana	IL	6a	Apr 15	Oct 24
Midland	MI	6a	Apr 29	Oct 16
Westfield	MA	6a	May 3	Oct 8
Leominster	MA	6a	Apr 29	Oct 11
Buffalo Grove	IL	6a	Apr 19	Oct 26
Quincy	IL	6a	Apr 8	Oct 30
Holyoke	MA	6a	May 3	Oct 8
Fitchburg	MA	6a	May 1	Oct 9
Warren	OH	6a	May 8	Oct 12
Amherst	MA	6a	May 5	Oct 8
Lancaster	OH	6a	Apr 22	Oct 24
Romeoville	IL	6a	Apr 20	Oct 22
Northglenn	CO	6a	May 2	Oct 11
Wheeling	IL	6a	Apr 19	Oct 26
Lima	OH	6a	Apr 24	Oct 24
Park Ridge	IL	6a	Apr 16	Oct 28
Addison	IL	6a	Apr 16	Oct 28
Calumet City	IL	6a	Apr 23	Oct 20
Portage	IN	6a	Apr 22	Oct 27
Westfield	IN	6a	Apr 21	Oct 21
Clifton Park	NY	6a	Apr 27	Oct 15
Marion	OH	6a	Apr 25	Oct 20
West Torrington	CT	6a	May 8	Oct 5
Richmond	IN	6a	Apr 24	Oct 20
Boardman	OH	6a	May 8	Oct 12
Oak Creek	WI	6a	Apr 22	Oct 26
Merrillville	IN	6a	Apr 22	Oct 25
Torrington	CT	6a	May 8	Oct 5
Derry Village	NH	6a	Apr 30	Oct 11
Bay City	MI	6a	Apr 27	Oct 20
Shrewsbury	MA	6a	Apr 23	Oct 21
Dakota Ridge	CO	6a	May 2	Oct 11
Northbrook	IL	6a	Apr 26	Oct 21
Woodridge	IL	6a	Apr 28	Oct 16
Elk Grove Village	IL	6a	Apr 16	Oct 28
Pekin	IL	6a	Apr 16	Oct 23
Jackson	MI	6a	May 1	Oct 14
Englewood	CO	6a	May 2	Oct 11
Goshen	IN	6a	Apr 26	Oct 21
Security-Widefield	CO	6a	May 3	Oct 8
Valparaiso	IN	6a	Apr 22	Oct 25
Ken Caryl	CO	6a	May 2	Oct 11
Danville	IL	6a	Apr 21	Oct 20
Michigan City	IN	6a	Apr 19	Oct 27
Wheat Ridge	CO	6a	May 5	Oct 5
Gurnee	IL	6a	Apr 30	Oct 19
Dover	NH	6a	May 3	Oct 10
Ithaca	NY	6a	May 11	Oct 3
Plainfield	IN	6a	Apr 12	Oct 27
Granger	IN	6a	Apr 23	Oct 23
Liberty	MO	6a	Apr 19	Oct 17
Chicago Heights	IL	6a	Apr 23	Oct 20
Jamestown	NY	6a	May 8	Oct 13
Rochester	NH	6a	Apr 30	Oct 9
Niles	IL	6a	Apr 16	Oct 28
Highland Park	IL	6a	Apr 26	Oct 21
Austintown	OH	6a	May 8	Oct 12
Pueblo West	CO	6a	Apr 26	Oct 13
Salem	NH	6a	Apr 21	Oct 21
North Chicago	IL	6a	Apr 30	Oct 19
Glenville	NY	6a	May 7	Oct 7
Burbank	IL	6a	Apr 10	Nov 1
Marion	IN	6a	Apr 26	Oct 20
Dracut	MA	6a	Apr 30	Oct 10
Schererville	IN	6a	Apr 23	Oct 20
Burton	MI	6a	May 8	Oct 5
East Chicago	IN	6a	Apr 23	Oct 20
Northampton	MA	6a	May 5	Oct 8
Hobart	IN	6a	Apr 22	Oct 27
Lansing	IL	6a	Apr 23	Oct 20
Elmira	NY	6a	May 6	Oct 11
Glen Ellyn	IL	6a	Apr 28	Oct 16
Oak Forest	IL	6a	Apr 23	Oct 20
Vestal	NY	6a	May 5	Oct 12
Fountain	CO	6a	May 3	Oct 8
Lafayette	CO	6a	May 2	Oct 11
West Scarborough	ME	6a	Apr 26	Oct 15
Wilmette	IL	6a	Apr 26	Oct 21
Auburn	NY	6a	May 2	Oct 18
Back Mountain	PA	6a	Apr 23	Oct 20
Wooster	OH	6a	Apr 30	Oct 12
Merrimack	NH	6a	Apr 30	Oct 12
Medina	OH	6a	Apr 29	Oct 19
Vernon Hills	IL	6a	Apr 29	Oct 20
Zionsville	IN	6a	Apr 21	Oct 20
Mount Pleasant	WI	6a	Apr 20	Oct 24
Mount Pleasant	MI	6a	Apr 30	Oct 20
Forest Hills	MI	6a	Apr 29	Oct 20
New Lenox	IL	6a	Apr 19	Oct 25
Troy	OH	6a	Apr 18	Oct 23
South Portland	ME	6a	Apr 26	Oct 15
Burlington	IA	6a	Apr 15	Oct 20
Melrose Park	IL	6a	Apr 16	Oct 28
Harvey	IL	6a	Apr 23	Oct 20
Lockport	IL	6a	Apr 20	Oct 22
Brownsburg	IN	6a	Apr 12	Oct 29
Saginaw Township North	MI	6a	Apr 29	Oct 21
Westmont	IL	6a	Apr 28	Oct 16
Hastings	NE	6a	Apr 22	Oct 16
Elmwood Park	IL	6a	Apr 16	Oct 28
Walker	MI	6a	May 6	Oct 10
Homer Glen	IL	6a	Apr 20	Oct 22
Columbine	CO	6a	May 2	Oct 11
Rolling Meadows	IL	6a	Apr 19	Oct 26
Zion	IL	6a	Apr 30	Oct 21
Maywood	IL	6a	Apr 11	Oct 31
Holt	MI	6a	Apr 28	Oct 17
Waverly	MI	6a	May 1	Oct 13
South Portland Gardens	ME	6a	Apr 26	Oct 15
Blue Island	IL	6a	Apr 10	Nov 1
Morton Grove	IL	6a	Apr 26	Oct 21
Gallup	NM	6a	May 11	Oct 7
Dolton	IL	6a	Apr 23	Oct 20
East Peoria	IL	6a	Apr 16	Oct 23
Solon	OH	6a	Apr 8	Nov 12
Munster	IN	6a	Apr 23	Oct 20
Highland	IN	6a	Apr 23	Oct 20
Auburn Hills	MI	6a	Apr 26	Oct 22
Darien	IL	6a	Apr 19	Oct 22
Ludlow	MA	6a	May 3	Oct 14
Oxford	OH	6a	Apr 19	Oct 22
Alliance	OH	6a	May 2	Oct 13
South Holland	IL	6a	Apr 23	Oct 20
Derry	NH	6a	Apr 30	Oct 11
Villa Park	IL	6a	Apr 28	Oct 16
Park Forest	IL	6a	Apr 23	Oct 20
La Porte	IN	6a	Apr 19	Oct 27
Wadsworth	OH	6a	Apr 29	Oct 19
Westford	MA	6a	Apr 30	Oct 10
Portsmouth	NH	6a	May 4	Oct 8
Greenfield	IN	6a	Apr 19	Oct 22
Okemos	MI	6a	Apr 28	Oct 17
Fairfield Heights	IN	6a	Apr 12	Oct 29
South Milwaukee	WI	6a	Apr 22	Oct 26
Charleston	IL	6a	Apr 15	Oct 23
Bedford	NH	6a	Apr 21	Oct 19
Crest Hill	IL	6a	Apr 20	Oct 22
Sidney	OH	6a	Apr 27	Oct 20
Piqua	OH	6a	Apr 18	Oct 23
Latham	NY	6a	Apr 27	Oct 15
Adrian	MI	6a	May 1	Oct 15
Rotterdam	NY	6a	Apr 27	Oct 15
Libertyville	IL	6a	Apr 30	Oct 19
Louisville	CO	6a	May 6	Oct 5
Golden	CO	6a	May 3	Oct 14
Ashland	OH	6a	Apr 30	Oct 15
Ypsilanti	MI	6a	May 5	Oct 10
Mokena	IL	6a	Apr 23	Oct 20
Evergreen Park	IL	6a	Apr 10	Nov 1
Greenfield	MA	6a	May 1	Oct 11
Papillion	NE	6a	Apr 17	Oct 19
Lake Forest	IL	6a	Apr 30	Oct 19
Homewood	IL	6a	Apr 23	Oct 20
Alsip	IL	6a	Apr 10	Nov 1
Bellwood	IL	6a	Apr 16	Oct 28
Broadview Heights	OH	6a	Apr 20	Nov 3
Haslett	MI	6a	Apr 28	Oct 17
Matteson	IL	6a	Apr 23	Oct 20
Shelbyville	IN	6a	Apr 17	Oct 22
Jacksonville	IL	6a	Apr 17	Oct 21
Amherst Center	MA	6a	May 5	Oct 8
Deerfield	IL	6a	Apr 26	Oct 21
Brookfield	IL	6a	Apr 11	Oct 31
Twinsburg	OH	6a	Apr 30	Oct 21
Mayfield Heights	OH	6a	Apr 26	Oct 31
Brigham City	UT	6a	May 5	Oct 5
Frankfort	IL	6a	Apr 23	Oct 20
Niles	OH	6a	May 8	Oct 12
Goodings Grove	IL	6a	Apr 19	Oct 22
Macomb	IL	6a	Apr 17	Oct 22
Bensenville	IL	6a	Apr 16	Oct 28
Cudahy	WI	6a	Apr 19	Oct 29
Amesbury	MA	6a	May 1	Oct 12
Franklin Park	IL	6a	Apr 16	Oct 28
Sherrelwood	CO	6a	May 2	Oct 11
Palmer	MA	6a	May 3	Oct 14
Mattoon	IL	6a	Apr 11	Oct 29
Hannibal	MO	6a	Apr 10	Oct 27
Logansport	IN	6a	Apr 20	Oct 23
Oswego	NY	6a	Apr 22	Oct 29
Tiffin	OH	6a	Apr 23	Oct 23
South Hadley	MA	6a	May 5	Oct 8
Hinsdale	IL	6a	Apr 28	Oct 16
New Castle	IN	6a	Apr 27	Oct 17
Allendale	MI	6a	Apr 30	Oct 24
Palos Hills	IL	6a	Apr 19	Oct 22
Kirksville	MO	6a	Apr 21	Oct 19
Huntington	IN	6a	May 1	Oct 14
La Vista	NE	6a	Apr 17	Oct 19
Norwalk	OH	6a	Apr 25	Oct 25
Country Club Hills	IL	6a	Apr 23	Oct 20
Lemont	IL	6a	Apr 20	Oct 22
Defiance	OH	6a	Apr 22	Oct 24
Mount Vernon	OH	6a	May 1	Oct 10
Westchester	IL	6a	Apr 11	Oct 31
Auburn	MA	6a	Apr 23	Oct 21
Washington	IL	6a	Apr 21	Oct 17
Easthampton	MA	6a	May 3	Oct 8
Jenison	MI	6a	May 6	Oct 10