Zones / 6a

Zone 6a

In the 2023 PRISM ZIP table, zone 6a is labeled with an average annual extreme minimum of -10°F to -5°F. 5,183 ZIP codes carry that half-zone. USDA’s map page describes these bands as 5°F half-zones inside 10°F zones.

Among cities on this site in this half-zone, the median last 32°F date at each city’s station runs from April 10 to June 4. That is a range across stations, not a zone-wide frost normal. USDA does not publish a single frost date per half-zone.

• Chicago, ILZIP 60608 · 1 miles from the city point
• Denver, COZIP 80238 · 1.1 miles from the city point
• Milwaukee, WIZIP 53210 · 0.5 miles from the city point
• Colorado Springs, COZIP 80909 · 1.3 miles from the city point
• Omaha, NEZIP 68114 · 0.1 miles from the city point
• Aurora, COZIP 80018 · 1.9 miles from the city point
• Lincoln, NEZIP 68503 · 1 miles from the city point
• Fort Wayne, INZIP 46805 · 1.5 miles from the city point
• Worcester, MAZIP 01608 · 0.6 miles from the city point
• Grand Rapids, MIZIP 49503 · 0.2 miles from the city point
• Lakewood, COZIP 80226 · 1.6 miles from the city point
• Springfield, MAZIP 01109 · 0.6 miles from the city point
• Thornton, COZIP 80241 · 0.9 miles from the city point
• Syracuse, NYZIP 13202 · 0.4 miles from the city point
• Ann Arbor, MIZIP 48104 · 1.2 miles from the city point
• Arvada, COZIP 80005 · 1.6 miles from the city point
• Manchester, NHZIP 03101 · 1.1 miles from the city point
• Westminster, COZIP 80031 · 1.3 miles from the city point
• Lansing, MIZIP 48933 · 1.1 miles from the city point
• Springfield, ILZIP 62701 · 0.7 miles from the city point
• Peoria, ILZIP 61614 · 0.9 miles from the city point
• Pueblo, COZIP 81003 · 2.5 miles from the city point
• Centennial, COZIP 80112 · 1.2 miles from the city point
• Boulder, COZIP 80310 · 1.5 miles from the city point
• Fishers, INZIP 46037 · 1.3 miles from the city point
• South Bend, INZIP 46601 · 0.9 miles from the city point
• Carmel, INZIP 46032 · 1.4 miles from the city point
• Albany, NYZIP 12206 · 1 miles from the city point
• Champaign, ILZIP 61821 · 0.2 miles from the city point
• Nashua, NHZIP 03060 · 1.7 miles from the city point
• Waukegan, ILZIP 60085 · 1.1 miles from the city point
• Farmington Hills, MIZIP 48334 · 1.9 miles from the city point
• Cicero, ILZIP 60804 · 0.3 miles from the city point
• Flint, MIZIP 48502 · 0.7 miles from the city point
• Bloomington, ILZIP 61701 · 1.2 miles from the city point
• Wyoming, MIZIP 49519 · 0.7 miles from the city point
• Rochester Hills, MIZIP 48309 · 1.5 miles from the city point
• Broomfield, COZIP 80020 · 2 miles from the city point
• Racine, WIZIP 53405 · 0.8 miles from the city point
• Flagstaff, AZZIP 86005 · 6.7 miles from the city point
• Hammond, INZIP 46320 · 0.7 miles from the city point
• Evanston, ILZIP 60201 · 0.6 miles from the city point
• Arlington Heights, ILZIP 60004 · 1.1 miles from the city point
• Noblesville, INZIP 46062 · 3.2 miles from the city point
• Bolingbrook, ILZIP 60440 · 1.8 miles from the city point
• Kalamazoo, MIZIP 49008 · 1.5 miles from the city point
• Lafayette, INZIP 47901 · 1.9 miles from the city point
• St. Joseph, MOZIP 64501 · 1.3 miles from the city point
• Commerce City, COZIP 80022 · 1.5 miles from the city point
• Portland, MEZIP 04108 · 0.3 miles from the city point
• Schenectady, NYZIP 12307 · 0.3 miles from the city point
• Decatur, ILZIP 62523 · 1.3 miles from the city point
• Haverhill, MAZIP 01830 · 2 miles from the city point
• Greenwood, INZIP 46143 · 0.7 miles from the city point
• Novi, MIZIP 48375 · 1.5 miles from the city point
• Gary, INZIP 46407 · 1.2 miles from the city point
• Skokie, ILZIP 60076 · 0.6 miles from the city point
• Muncie, INZIP 47305 · 0.6 miles from the city point
• Bellevue, NEZIP 68056 · 1.8 miles from the city point
• Westfield, INZIP 46074 · 1.1 miles from the city point
• Pontiac, MIZIP 48342 · 0.7 miles from the city point
• Kokomo, INZIP 46902 · 2.5 miles from the city point
• Youngstown, OHZIP 44503 · 0.2 miles from the city point
• Des Plaines, ILZIP 60016 · 1.3 miles from the city point
• Terre Haute, INZIP 47807 · 1.6 miles from the city point
• Pocatello, IDZIP 83209 · 2.2 miles from the city point
• Springfield, OHZIP 45501 · 0.7 miles from the city point
• Orland Park, ILZIP 60467 · 1.6 miles from the city point
• Logan, UTZIP 84341 · 2.6 miles from the city point
• Oak Lawn, ILZIP 60453 · 0 miles from the city point
• Anderson, INZIP 46016 · 0.7 miles from the city point
• Mount Prospect, ILZIP 60056 · 0.2 miles from the city point
• Chicopee, MAZIP 01020 · 0.5 miles from the city point
• Berwyn, ILZIP 60402 · 0.7 miles from the city point
• Tinley Park, ILZIP 60477 · 1 miles from the city point
• Kentwood, MIZIP 49508 · 2 miles from the city point
• Manhattan, KSZIP 66506 · 1.4 miles from the city point
• Elkhart, INZIP 46516 · 1.1 miles from the city point
• Normal, ILZIP 61761 · 2.4 miles from the city point
• Oak Park, ILZIP 60302 · 0.5 miles from the city point
• Battle Creek, MIZIP 49015 · 1.4 miles from the city point
• Newark, OHZIP 43055 · 3.6 miles from the city point
• Troy, NYZIP 12183 · 1.2 miles from the city point
• Mishawaka, INZIP 46545 · 1.5 miles from the city point
• Downers Grove, ILZIP 60515 · 1.1 miles from the city point
• Portage, MIZIP 49024 · 1.5 miles from the city point
• Lawrence, INZIP 46216 · 1 miles from the city point
• Sheboygan, WIZIP 53081 · 2 miles from the city point
• East Lansing, MIZIP 48825 · 1.3 miles from the city point
• Glenview, ILZIP 60026 · 0.7 miles from the city point
• Mansfield, OHZIP 44903 · 0.7 miles from the city point
• Binghamton, NYZIP 13902 · 3.2 miles from the city point
• West Lafayette, INZIP 47907 · 1.6 miles from the city point
• Elmhurst, ILZIP 60126 · 0.1 miles from the city point
• Littleton, COZIP 80120 · 0.5 miles from the city point
• Lombard, ILZIP 60148 · 0.2 miles from the city point
• Leominster, MAZIP 01453 · 0.4 miles from the city point
• Buffalo Grove, ILZIP 60089 · 0.1 miles from the city point
• Saginaw, MIZIP 48607 · 1.2 miles from the city point
• Midland, MIZIP 48642 · 5.4 miles from the city point
• Fitchburg, MAZIP 01420 · 1.2 miles from the city point
• Lancaster, OHZIP 43130 · 2.1 miles from the city point
• Romeoville, ILZIP 60446 · 0.4 miles from the city point
• Amherst Town, MAZIP 01003 · 2.1 miles from the city point

Source: PRISM 2023 PHZM ZIP CSV and USDA Plant Hardiness Zone Map.