North American pit vipers

Pit vipers belong to the family Viperidae (Vipers), subfamily Crotalinae (Pit Vipers). The following list of pit viper species and subspecies found in the United States and Canada is based on the master list of The Center for North American Herpetology. The links to the corresponding Wikipedia pages are added when available to facilitate finding additional information about these species, but linking to external pages does not imply that all information on those pages is fully correct.

The Book
“Though generally one may expect a more impressive or less impressive clinical picture with a bite by one species of snake over another species, it is important to remember that it is symptomatology and lab values that determine treatment, not the size or type of pit viper.”