1. Western North America:
- Pacific Northwest: Washington, Oregon, Idaho, Montana
- Northern California
2. Rocky Mountains:
- Colorado, Wyoming, Utah, Montana
- Central British Columbia
3. New England:
- Maine, Vermont, New Hampshire, Massachusetts, Connecticut
4. Northern Great Plains:
- Minnesota, North Dakota, South Dakota
5. Eastern Canada:
- Newfoundland and Labrador, Québec, Ontario, New Brunswick, Nova Scotia, Prince Edward Island
6. Mid-Atlantic States:
- New York, Pennsylvania, Maryland, Delaware
7. Southern United States:
- West Virginia, Virginia, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Louisiana