All rattlesnakes also molt as they grow. Timber rattlesnakes shed their skin about once a year. They are not completely nocturnal. However, they see better in dimmer light because of their high sensitive eyes. Rattlesnakes usually lay around more during the day, getting some sunlight, and move more at night.
Females begin to mate when they are about two and a half years old.
The male usually slithers beside the female and nudges her. The posterior part of his body shakes rapidly as his tail goes around the females. Rattlesnakes copulation lasts about an hour or a little more. Six to twelve hours in duration is also common. In about six months the female will give birth to the young.