Bull Snake — care sheet

Beginner–Intermediate. Hardy, forgiving, and a strong eater, which makes a bull snake a genuinely good first big snake. The "intermediate" nudge is about size and attitude, not fragility: adults are large, powerful, active snakes, and many are dramatic bluffers (loud hiss, tail-rattle, S-strike) before they settle. Give it space, respect the bluff, and it becomes calm and manageable.

Strictly carnivorous: appropriately sized frozen-thawed rodents (mice graduating to rats), each roughly as wide as the snake's thickest point. Hatchlings/juveniles about every 5-7 days; adults about every 7-14 days. Provide a large, sturdy water bowl at all times.

Adult minimum around 4 x 2 x 2 ft (48\" L x 24\" D x 24\" H) of floor space; bigger is better, and large 6-8 ft animals need substantially more room. A front-opening wooden or PVC vivarium holds heat and low humidity better than a screen-top glass tank.

Warm-side hotspot around 88-90°F (31-32°C); a basking surface up to ~90-92°F (32-33°C) is fine. Always verify with a probe thermometer at snake level, not a stick-on dial.

Cool end around 70-78°F (21-26°C), giving the snake a proper thermal gradient to choose from across the enclosure.

A modest night drop is natural and healthy; letting the cool end fall to the low 70s°F (around 68-72°F / 20-22°C) is fine. No overnight bright light is needed.

Optional but recommended. Bull snakes can thrive on whole prey without UVB, but modern best practice provides low-level UVB for overall health: a T5 HO 5-6% tube (e.g., Arcadia Forest 6% or Zoo Med ReptiSun 5.0) spanning about half the enclosure on the warm side, mounted so the basking zone sits in a low UVI band. Replace UVB tubes about every 12 months.

Low and dry: roughly 30-50% ambient humidity. Chronically damp, high humidity paired with cool temps invites scale rot and respiratory infection. Always offer a humid hide (damp sphagnum moss) and raise humidity briefly around shed to help a clean, one-piece slough.

A deep, dry, burrow-friendly layer of aspen shavings, cypress mulch, or a naturalistic soil-based (bioactive) mix. Provide several inches for burrowing. Avoid cedar and pine shavings, which release oils harmful to reptiles.

None required when feeding nutritionally complete whole prey (frozen-thawed rodents supply the vitamins and calcium a bull snake needs). Skip dusting and vitamin drops; correct prey size and feeding frequency matter far more.

Typically 4-6 ft, with some individuals reaching 8 ft. One of the largest colubrid (non-python) snakes in North America.

15-20+ years in captivity; well-kept animals can reach 25 years or more.

See a reptile or exotics vet if you notice: Open-mouth breathing, wheezing, gurgling, or bubbly mucus around the nose/mouth (possible respiratory infection) - see an exotics vet.; Discolored, blistered, or raw scales on the belly, or a red/sour-smelling mouth (scale rot or mouth rot) - needs veterinary care.; Refusing food for an unusually long stretch alongside weight loss or lethargy (beyond a normal seasonal or pre-shed slowdown).; Repeated incomplete sheds, or retained eye caps or tail-tip skin, which can constrict and cause injury.; Tiny moving dots (mites) on the snake or in the water bowl, especially with excessive soaking.; Regurgitation of meals, straining, visible swelling, or a wound/burn from a heat source - get it checked promptly..