Six venomous snakes make their home in the Greater Houston area, the Texas coral snake and five pit vipers: the southern copperhead, western cottonmouth, western pygmy rattlesnake, western diamondback rattlesnake and timber rattlesnake. Disturb a snake, no matter the time of day or year, and it could strike. You’re more likely to see a snake during the day in spring or fall and at night in summer. But don’t relax in winter, cautions Jon Thompson, director of Southeast Texas Poison Center at UTMB. “There’s no guarantee that snakes this far south are going to hibernate. They’ll be less active in colder months, but we’ve gotten calls about snakebites even on Christmas day.”