They are found in woodlands and forests of eastern United States of America, from southern Minnesota and southern New Hampshire, south to east Texas and north Florida. During the summer pregnant females prefer open, rocky ledges, where the temperature is higher, while males and non-pregnant females spend more time in cooler woodlands with a closed forest canopy. Females usually bask in the sun before having babies in open rocky areas, known as "basking knolls". In the winter Timber Rattlesnakes hibernate in dens and caves.