Answer: Centennial is only considered hardy into zone 7 and according to your zip code you are gardening in zone 5. Two zones is a big difference to try to overcome with microclimate and so I definitely would not recommend Centennial for your area.
In zone 5, you have a fairly limited selection of crepe myrtles. You might try Pecos, Zuni or Tuscarora -- these are considerd hardy into zone 6 so would have a better chance in your area if you have a sheltered spot with protection from winter winds and excellent drainage. Please understand that they are not reliably hardy in zone 5 so they may not survive for you, or they may be root hardy but never grow to their full size due to dieing back every winter. Your local professional nursery staff and/or county extension should be most familiar with what you can expect. Good luck with your experiment!
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