Milky Way Planner has pages for 5 dark sky places in Virginia: 5 parks. Their Bortle classes run from 4 to 6. Each page has the Bortle class, the best months for the Milky Way and a free visibility calendar.
Park · Bortle 4
Park · Bortle 5
Park · Bortle 6
Park · Bortle 6
Park · Bortle 5