Where zone 6a shows up
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Albany, NY | 6a | Apr 27 | Oct 15 | 171 |
| Chicago, IL | 6a | Apr 16 | Oct 28 | 195 |
| Dayton, OH | 6a | Apr 16 | Oct 28 | 195 |
| Denver, CO | 6a | May 5 | Oct 9 | 157 |
| Flagstaff, AZ | 6a | Jun 4 | Sep 28 | 116 |
| Goodland, KS | 6a | May 2 | Oct 11 | 162 |
| Marquette, MI | 6a | May 8 | Oct 21 | 166 |
| Pocatello, ID | 6a | May 23 | Sep 18 | 118 |
| Portland, ME | 6a | Apr 26 | Oct 15 | 172 |
| Syracuse, NY | 6a | Apr 29 | Oct 19 | 173 |
| Milwaukee, WI | 6a | Apr 27 | Oct 20 | 176 |
| Colorado Springs, CO | 6a | May 13 | Oct 3 | 143 |
| Aurora, CO | 6a | May 5 | Oct 8 | 156 |
| Lincoln, NE | 6a | Apr 23 | Oct 14 | 174 |
| Fort Wayne, IN | 6a | Apr 28 | Oct 17 | 172 |
| Buffalo, NY | 6a | May 3 | Oct 17 | 167 |
| Grand Rapids, MI | 6a | May 4 | Oct 14 | 163 |
| Springfield, MA | 6a | May 5 | Oct 9 | 157 |
| Thornton, CO | 6a | May 5 | Oct 8 | 156 |
| Sterling Heights, MI | 6a | May 2 | Oct 16 | 167 |
| Amherst, NY | 6a | May 3 | Oct 17 | 167 |
| Independence, MO | 6a | Apr 15 | Oct 22 | 190 |
| Ann Arbor, MI | 6a | May 2 | Oct 12 | 163 |
| Springfield, IL | 6a | Apr 14 | Oct 21 | 190 |
| Lansing, MI | 6a | May 1 | Oct 15 | 167 |
| Lowell, MA | 6a | Apr 28 | Oct 13 | 168 |
| East Independence, MO | 6a | Apr 15 | Oct 22 | 190 |
| Manchester, NH | 6a | Apr 28 | Oct 13 | 168 |
| Centennial, CO | 6a | May 5 | Oct 8 | 156 |
| Waterbury, CT | 6a | May 2 | Oct 12 | 163 |
| South Bend, IN | 6a | Apr 28 | Oct 20 | 175 |
| Kenosha, WI | 6a | Apr 25 | Oct 21 | 179 |
| Clinton Township, MI | 6a | May 1 | Oct 20 | 172 |
| Flint, MI | 6a | May 4 | Oct 12 | 161 |
| Highlands Ranch, CO | 6a | May 5 | Oct 8 | 156 |
| West Albany, NY | 6a | Apr 30 | Oct 13 | 166 |
| Carmel, IN | 6a | Apr 17 | Oct 24 | 190 |
| Waukegan, IL | 6a | Apr 24 | Oct 23 | 182 |
| Nashua, NH | 6a | Apr 28 | Oct 13 | 168 |
| West Town, IL | 6a | Apr 17 | Oct 26 | 192 |
| Champaign, IL | 6a | Apr 20 | Oct 18 | 181 |
| Near North Side, IL | 6a | Apr 17 | Oct 26 | 192 |
| Ogden, UT | 6a | May 13 | Oct 4 | 144 |
| Bloomington, IN | 6a | Apr 17 | Oct 22 | 188 |
| Cicero, IL | 6a | Apr 17 | Oct 26 | 192 |
| Troy, MI | 6a | May 2 | Oct 16 | 167 |
States with zone 6a ground
Arizona
Colorado
Connecticut
Idaho
Illinois
Indiana
Kansas
Massachusetts
Maine
Michigan
Missouri
Nebraska
New Hampshire
New York
Ohio
Utah
Wisconsin
Bottom line: zone 6a tells you what will survive your
winter. It does not tell you when to plant — two zone-6a gardens in this list are
51 days apart on last frost.
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