May congregate at winter dens; at least formerly, dens served up to 100-200 individuals.
Movements tend to be greatest in spring, less in summer and fall (e.g., around 45-60 m per day), and least in winter (Landreth 1973). In southeastern Arizona, mean home range size was 5.42 ha and individuals moved an average of 51 m per day during the active season (Beck 1995).
In Oklahoma, slightly more than half of the snakes collected in rattlesnake roundups in April were second-year young and young adults thought to be 3-4 years old; annual adult mortality was estimated at 20% (Fitch and Pisani 1993).
Young are vulnerable to various carnivorous animals; humans are the only significant predators on adults.