The 1990 USDA Plant Hardiness Zone Map for Illinois was the official USDA zone reference for over two decades. It was based on average annual extreme minimum winter temperature data collected from 1974 to 1986. Use the table below to compare 1990 zones to the revised 2012 zones and the current 2023 zones.
| Location | 1990 Hardiness Zone | 2012 Zone | 2023 Zone |
|---|---|---|---|
| Addison | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Algonquin | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Alsip | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Alton | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Arlington Heights | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Aurora | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Bartlett | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Batavia | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Belleville | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Bellwood | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Belvidere | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Bensenville | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Berwyn | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Bloomingdale | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Bloomington | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Blue Island | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Bolingbrook | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Bourbonnais | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Bradley | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Bridgeview | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Brookfield | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Burbank | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Calumet City | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Carbondale | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Carol Stream | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Carpentersville | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Cary | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Champaign | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Charleston | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Chicago | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6b — -5°F to 0°F |
| Chicago Heights | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Cicero | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Collinsville | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Country Club Hills | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Crest Hill | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Crystal Lake | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Danville | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Darien | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Darien | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Decatur | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Deerfield | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| DeKalb | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Des Plaines | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Dixon | 5a — -20°F to -15°F | 5a — -20°F to -15°F | 5b — -15°F to -10°F |
| Dolton | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Downers Grove | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| East Moline | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| East Peoria | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Edwardsville | 6a — -10°F to -5°F | 6a — -10°F to -5°F | 7a — 0°F to 5°F |
| Elgin | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Elk Grove Village | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Elmhurst | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Elmwood Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Evanston | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Evergreen Park | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Fairview Heights | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Frankfort | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Franklin Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Freeport | 5a — -20°F to -15°F | 5a — -20°F to -15°F | 5b — -15°F to -10°F |
| Galesburg | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Geneva | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Glen Ellyn | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Glendale Heights | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Glenview | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Godfrey | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6b — -5°F to 0°F |
| Granite City | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Grayslake | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Gurnee | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Hanover Park | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Harvey | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Highland Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Hinsdale | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Hoffman Estates | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Homer Glen | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Homewood | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Huntley | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Jacksonville | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Joliet | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Kankakee | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| La Grange | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lake Forest | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lake in the Hills | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Lake Zurich | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Lansing | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lemont | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Libertyville | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lisle | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lockport | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Lombard | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Loves Park | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Machesney Park | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Macomb | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Marion | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Matteson | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Mattoon | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6b — -5°F to 0°F |
| Maywood | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| McHenry | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Melrose Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Mokena | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Moline | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Montgomery | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Morton | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Morton Grove | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Mount Prospect | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Mundelein | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Naperville | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| New Lenox | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Niles | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Normal | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Norridge | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| North Aurora | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| North Chicago | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Northbrook | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| O'Fallon | 6a — -10°F to -5°F | 6b — -5°F to 0°F | 7a — 0°F to 5°F |
| Oak Forest | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Oak Lawn | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Oak Park | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Orland Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Oswego | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Ottawa | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Palatine | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Palos Hills | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Park Forest | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Park Ridge | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Pekin | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Peoria | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Plainfield | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Prospect Heights | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Quincy | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Rock Island | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Rockford | 4b — -25°F to -20°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Rolling Meadows | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Romeoville | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Roselle | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Round Lake | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Round Lake Beach | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Schaumburg | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Shorewood | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Skokie | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| South Elgin | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| South Holland | 5b — -15°F to -10°F | 6a — -10°F to -5°F | 6a — -10°F to -5°F |
| Springfield | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Streamwood | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Sycamore | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Tinley Park | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Urbana | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Vernon Hills | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Villa Park | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Washington | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Waukegan | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| West Chicago | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Westchester | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Westmont | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Wheaton | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Wheeling | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Wilmette | 5b — -15°F to -10°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Woodridge | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
| Woodstock | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Yorkville | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 5b — -15°F to -10°F |
| Zion | 5a — -20°F to -15°F | 5b — -15°F to -10°F | 6a — -10°F to -5°F |
The 1990 USDA Plant Hardiness Zone Map was produced by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) in collaboration with the American Horticultural Society. It served as the official US planting zone reference from 1990 until the 2012 revision.
Official source: USDA Plant Hardiness Zone Map — planthardiness.ars.usda.gov
This interactive map presentation is provided by PlantMaps. The underlying hardiness zone boundary data is sourced from the USDA Agricultural Research Service. Zone assignments for individual cities and towns are derived from PlantMaps climate data.