USDA hardiness zone 5b
In zone 5b the average coldest winter night reaches -15°F to -10°F. Plants labeled for zone 5 (or a colder zone) can survive the winter outdoors here. 213 U.S. cities with 10,000+ residents are in this zone.
| City | State | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|---|
| Des Moines | IA | 5b | Apr 18 | Oct 20 |
| Aurora | IL | 5b | Apr 19 | Oct 23 |
| Fort Collins | CO | 5b | May 2 | Oct 7 |
| Rockford | IL | 5b | Apr 24 | Oct 17 |
| Naperville | IL | 5b | Apr 28 | Oct 16 |
| Cedar Rapids | IA | 5b | Apr 28 | Oct 12 |
| Elgin | IL | 5b | Apr 26 | Oct 18 |
| Greeley | CO | 5b | May 2 | Oct 8 |
| Green Bay | WI | 5b | May 7 | Oct 9 |
| Davenport | IA | 5b | Apr 19 | Oct 22 |
| Longmont | CO | 5b | May 7 | Oct 5 |
| Loveland | CO | 5b | May 10 | Oct 1 |
| Schaumburg | IL | 5b | Apr 30 | Oct 13 |
| Iowa City | IA | 5b | Apr 21 | Oct 18 |
| Appleton | WI | 5b | May 4 | Oct 6 |
| Rapid City | SD | 5b | May 3 | Oct 8 |
| Waukesha | WI | 5b | May 1 | Oct 13 |
| Missoula | MT | 5b | May 10 | Oct 1 |
| Palatine | IL | 5b | Apr 25 | Oct 19 |
| Oshkosh | WI | 5b | Apr 24 | Oct 20 |
| Cheyenne | WY | 5b | May 14 | Oct 1 |
| Ames | IA | 5b | Apr 26 | Oct 8 |
| Janesville | WI | 5b | Apr 26 | Oct 15 |
| West Des Moines | IA | 5b | Apr 18 | Oct 20 |
| Utica | NY | 5b | May 1 | Oct 13 |
| West Allis | WI | 5b | Apr 26 | Oct 22 |
| Idaho Falls | ID | 5b | May 9 | Oct 1 |
| Clay | NY | 5b | May 4 | Oct 11 |
| Ankeny | IA | 5b | Apr 23 | Oct 15 |
| Castle Rock | CO | 5b | May 9 | Oct 2 |
| Bellevue | NE | 5b | Apr 17 | Oct 19 |
| Wheaton | IL | 5b | Apr 28 | Oct 16 |
| Hoffman Estates | IL | 5b | Apr 30 | Oct 13 |
| Grand Island | NE | 5b | Apr 23 | Oct 15 |
| Parker | CO | 5b | May 9 | Oct 3 |
| Wauwatosa | WI | 5b | Apr 26 | Oct 18 |
| Urbandale | IA | 5b | Apr 18 | Oct 20 |
| Concord | NH | 5b | May 8 | Oct 3 |
| Pittsfield | MA | 5b | May 5 | Oct 5 |
| DeKalb | IL | 5b | Apr 24 | Oct 18 |
| Fond du Lac | WI | 5b | Apr 27 | Oct 19 |
| Moline | IL | 5b | Apr 19 | Oct 22 |
| East Concord | NH | 5b | May 8 | Oct 3 |
| Plainfield | IL | 5b | Apr 20 | Oct 22 |
| Burlington | VT | 5b | Apr 29 | Oct 15 |
| Bartlett | IL | 5b | Apr 30 | Oct 13 |
| Streamwood | IL | 5b | Apr 30 | Oct 13 |
| Crystal Lake | IL | 5b | Apr 25 | Oct 22 |
| Carol Stream | IL | 5b | Apr 25 | Oct 19 |
| New Berlin | WI | 5b | May 3 | Oct 14 |
| Rock Island | IL | 5b | Apr 19 | Oct 22 |
| Carpentersville | IL | 5b | Apr 26 | Oct 18 |
| Hanover Park | IL | 5b | Apr 30 | Oct 13 |
| Brookfield | WI | 5b | Apr 30 | Oct 14 |
| Brighton | CO | 5b | May 3 | Oct 7 |
| Greenfield | WI | 5b | May 3 | Oct 14 |
| Beloit | WI | 5b | May 1 | Oct 12 |
| Franklin | WI | 5b | May 3 | Oct 14 |
| Lewiston | ME | 5b | Apr 25 | Oct 19 |
| Menomonee Falls | WI | 5b | May 6 | Oct 8 |
| Bettendorf | IA | 5b | Apr 19 | Oct 22 |
| Glendale Heights | IL | 5b | Apr 28 | Oct 16 |
| Oswego | IL | 5b | Apr 19 | Oct 23 |
| Kearney | NE | 5b | Apr 30 | Oct 10 |
| Manitowoc | WI | 5b | Apr 30 | Oct 20 |
| St. Charles | IL | 5b | Apr 25 | Oct 19 |
| Windsor | CO | 5b | May 3 | Oct 6 |
| Rome | NY | 5b | May 6 | Oct 13 |
| West Bend | WI | 5b | May 1 | Oct 12 |
| Cicero | NY | 5b | Apr 29 | Oct 19 |
| Mundelein | IL | 5b | Apr 29 | Oct 20 |
| Galesburg | IL | 5b | Apr 20 | Oct 19 |
| Algonquin | IL | 5b | Apr 26 | Oct 18 |
| Lake in the Hills | IL | 5b | Apr 25 | Oct 22 |
| Crown Point | IN | 5b | Apr 29 | Oct 16 |
| Fitchburg | WI | 5b | May 1 | Oct 9 |
| Round Lake Beach | IL | 5b | Apr 24 | Oct 23 |
| Saratoga Springs | NY | 5b | May 2 | Oct 7 |
| West Chicago | IL | 5b | Apr 25 | Oct 19 |
| Kankakee | IL | 5b | Apr 19 | Oct 24 |
| McHenry | IL | 5b | May 1 | Oct 11 |
| Batavia | IL | 5b | Apr 19 | Oct 23 |
| Fremont | NE | 5b | Apr 23 | Oct 15 |
| Clinton | IA | 5b | Apr 13 | Oct 26 |
| Huntley | IL | 5b | Apr 25 | Oct 22 |
| Neenah | WI | 5b | May 4 | Oct 6 |
| Woodstock | IL | 5b | Apr 25 | Oct 22 |
| Belvidere | IL | 5b | Apr 28 | Oct 12 |
| Muskego | WI | 5b | May 3 | Oct 14 |
| De Pere | WI | 5b | Apr 30 | Oct 9 |
| Caledonia | WI | 5b | Apr 24 | Oct 24 |
| Ottumwa | IA | 5b | Apr 23 | Oct 14 |
| North Platte | NE | 5b | May 3 | Oct 10 |
| Muscatine | IA | 5b | Apr 18 | Oct 24 |
| Watertown | WI | 5b | Apr 28 | Oct 12 |
| Loves Park | IL | 5b | Apr 24 | Oct 17 |
| Keene | NH | 5b | May 14 | Oct 1 |
| Mequon | WI | 5b | May 6 | Oct 8 |
| Roselle | IL | 5b | Apr 30 | Oct 13 |
| Lisle | IL | 5b | Apr 28 | Oct 16 |
| Machesney Park | IL | 5b | May 1 | Oct 12 |
| Auburn | ME | 5b | Apr 25 | Oct 19 |
| Columbus | NE | 5b | Apr 21 | Oct 15 |
| Wasco | IL | 5b | Apr 25 | Oct 19 |
| South Elgin | IL | 5b | Apr 26 | Oct 18 |
| Bloomingdale | IL | 5b | Apr 30 | Oct 13 |
| Kalispell | MT | 5b | May 31 | Sep 10 |
| Geneva | IL | 5b | Apr 25 | Oct 19 |
| Erie | CO | 5b | May 7 | Oct 5 |
| Evans | CO | 5b | May 2 | Oct 8 |
| East Moline | IL | 5b | Apr 24 | Oct 18 |
| Marquette | MI | 5b | May 8 | Oct 21 |
| Biddeford | ME | 5b | May 9 | Oct 3 |
| Grayslake | IL | 5b | Apr 24 | Oct 23 |
| Sanford | ME | 5b | May 16 | Sep 30 |
| Johnston | IA | 5b | Apr 19 | Oct 18 |
| Pleasant Prairie | WI | 5b | Apr 28 | Oct 19 |
| Coralville | IA | 5b | Apr 21 | Oct 18 |
| Gardner | MA | 5b | May 2 | Oct 13 |
| Elko | NV | 5b | May 29 | Sep 18 |
| Lake Zurich | IL | 5b | Apr 29 | Oct 20 |
| Germantown | WI | 5b | May 6 | Oct 8 |
| Montgomery | IL | 5b | Apr 19 | Oct 23 |
| Howard | WI | 5b | May 7 | Oct 9 |
| Saco | ME | 5b | May 9 | Oct 3 |
| Waukee | IA | 5b | Apr 19 | Oct 18 |
| Middleton | WI | 5b | Apr 28 | Oct 15 |
| Cortland | NY | 5b | May 7 | Oct 8 |
| Augusta | ME | 5b | Apr 27 | Oct 16 |
| Bourbonnais | IL | 5b | Apr 19 | Oct 24 |
| Round Lake | IL | 5b | Apr 24 | Oct 23 |
| Yorkville | IL | 5b | Apr 28 | Oct 13 |
| Ottawa | IL | 5b | Apr 20 | Oct 22 |
| Amsterdam | NY | 5b | May 7 | Oct 7 |
| Westbrook | ME | 5b | Apr 26 | Oct 15 |
| Cary | IL | 5b | May 1 | Oct 11 |
| Sycamore | IL | 5b | Apr 24 | Oct 18 |
| Menasha | WI | 5b | May 4 | Oct 6 |
| North Aurora | IL | 5b | Apr 19 | Oct 23 |
| Wilton | NY | 5b | May 2 | Oct 7 |
| Ashwaubenon | WI | 5b | Apr 30 | Oct 9 |
| Altoona | IA | 5b | Apr 21 | Oct 15 |
| Shorewood | IL | 5b | Apr 19 | Oct 25 |
| Oconomowoc | WI | 5b | Apr 30 | Oct 12 |
| Waterville | ME | 5b | May 2 | Oct 10 |
| Laconia | NH | 5b | Apr 30 | Oct 18 |
| Crawfordsville | IN | 5b | Apr 27 | Oct 12 |
| North Liberty | IA | 5b | Apr 21 | Oct 18 |
| Kaukauna | WI | 5b | May 4 | Oct 6 |
| Bradley | IL | 5b | Apr 19 | Oct 24 |
| Indianola | IA | 5b | Apr 24 | Oct 12 |
| Clive | IA | 5b | Apr 18 | Oct 20 |
| Dixon | IL | 5b | Apr 21 | Oct 19 |
| Bellevue | WI | 5b | May 6 | Oct 12 |
| Brunswick | ME | 5b | May 2 | Oct 10 |
| Newton | IA | 5b | Apr 22 | Oct 17 |
| Sterling | IL | 5b | Apr 21 | Oct 19 |
| Gloversville | NY | 5b | May 11 | Oct 3 |
| Ammon | ID | 5b | May 9 | Oct 1 |
| Johnstown | CO | 5b | May 10 | Oct 1 |
| Whitewater | WI | 5b | May 2 | Oct 9 |
| Lindenhurst | IL | 5b | Apr 24 | Oct 23 |
| Morris | IL | 5b | Apr 20 | Oct 23 |
| Greendale | WI | 5b | May 3 | Oct 14 |
| Antioch | IL | 5b | Apr 23 | Oct 21 |
| Sterling | CO | 5b | Apr 30 | Oct 9 |
| Allouez | WI | 5b | Apr 30 | Oct 9 |
| Olean | NY | 5b | May 7 | Oct 11 |
| Oneonta | NY | 5b | May 17 | Oct 3 |
| Wauconda | IL | 5b | Apr 29 | Oct 20 |
| Village of Campton Hills | IL | 5b | Apr 25 | Oct 19 |
| Warrenville | IL | 5b | Apr 28 | Oct 16 |
| North Adams | MA | 5b | May 10 | Oct 4 |
| Streator | IL | 5b | Apr 12 | Oct 28 |
| Black Forest | CO | 5b | May 9 | Oct 6 |
| Saint Marys | PA | 5b | May 14 | Oct 6 |
| Stoughton | WI | 5b | Apr 30 | Oct 11 |
| Claremont | NH | 5b | May 14 | Oct 1 |
| Channahon | IL | 5b | Apr 16 | Oct 26 |
| Kewanee | IL | 5b | Apr 24 | Oct 17 |
| Fort Atkinson | WI | 5b | Apr 28 | Oct 13 |
| Suamico | WI | 5b | May 7 | Oct 9 |
| Cedar Lake | IN | 5b | Apr 29 | Oct 16 |
| Firestone | CO | 5b | May 7 | Oct 5 |
| Maryville | MO | 5b | Apr 19 | Oct 17 |
| Oskaloosa | IA | 5b | Apr 21 | Oct 16 |
| Port Washington | WI | 5b | Apr 27 | Oct 22 |
| Richfield | WI | 5b | Apr 30 | Oct 16 |
| Cedarburg | WI | 5b | Apr 23 | Oct 24 |
| Salem | WI | 5b | Apr 30 | Oct 15 |
| Frederick | CO | 5b | May 7 | Oct 5 |
| Two Rivers | WI | 5b | Apr 27 | Oct 21 |
| Fort Morgan | CO | 5b | May 6 | Oct 6 |
| Spearfish | SD | 5b | May 12 | Oct 2 |
| Plano | IL | 5b | Apr 28 | Oct 13 |
| Minooka | IL | 5b | Apr 16 | Oct 26 |
| Oneida | NY | 5b | May 1 | Oct 13 |
| Little Chute | WI | 5b | May 4 | Oct 6 |
| Marinette | WI | 5b | May 4 | Oct 11 |
| Sussex | WI | 5b | Apr 30 | Oct 16 |
| Grimes | IA | 5b | Apr 19 | Oct 18 |
| Burlington | WI | 5b | May 5 | Oct 9 |
| Roscoe | IL | 5b | May 1 | Oct 12 |
| Fox Lake | IL | 5b | Apr 24 | Oct 23 |
| The Pinery | CO | 5b | May 9 | Oct 3 |
| Big Rapids | MI | 5b | May 13 | Oct 2 |
| Pella | IA | 5b | Apr 20 | Oct 19 |
| Castle Pines North | CO | 5b | May 9 | Oct 2 |
| Barrington | IL | 5b | Apr 25 | Oct 19 |
| Edwards | CO | 5b | Jun 6 | Sep 14 |
| Alpena | MI | 5b | May 5 | Oct 17 |
| Norwalk | IA | 5b | Apr 18 | Oct 20 |
| Lexington | NE | 5b | Apr 26 | Oct 13 |