| Zone 1 | Region 1 | Arizona, California, New Mexico, Nevada, Utah |
| Region 2 | Alaska, Hawaii, Colorado, Idaho, Kansas, Montana, Nebraska, N. Dakota, Oregon, S. Dakota, Washington, Wyoming |
| Zone 2 | Region 3 |
Illinois, Indiana, Iowa, Michigan, Minnesota, Wisconsin |
| Region 4 | Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
|
| Zone 3 | Region 5 | Delaware, Kentucky, Maryland, New Jersey, Ohio, Pennsylvania, Virginia, West Virginia
|
| Region 6 | Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, Missouri, N. Carolina, S. Carolina, Oklahoma, Tennessee, Texas |
