# Do Tortoises Hibernate or Brumate? A Safe Owner's Guide Do tortoises hibernate? In the strict sense, no. Tortoises are reptiles, and reptiles brumate, a cold-weather slowdown that is similar to hibernation but not identical. Many tortoise species do brumate in the wild, and some pet tortoises should be allowed to do so, while others should never be cooled at all. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Brumation is the correct term for reptiles. It is a state of low activity and low metabolism driven by cold temperatures, not true mammalian hibernation. - Not every tortoise brumates. Mediterranean species such as Hermann's, Greek, and marginated tortoises commonly do. Tropical species such as red-footed, leopard, and sulcata tortoises generally should not be cooled. - A healthy tortoise that brumates needs weeks of preparation, a controlled temperature, and regular weight checks. Brumation is a managed process, not something you simply let happen. - A tortoise that will not settle into brumation, or one that wakes in the middle of winter, is a medical concern. Book a veterinary visit. - Never brumate a sick, underweight, newly acquired, or recently treated tortoise. ## Do Tortoises Brumate or Hibernate? The Terms Matter Brumation and hibernation describe two different physiological events. Hibernation is the deep winter state seen in many mammals, with a large drop in body temperature and metabolism. Brumation is the reptile version, and it is triggered mainly by falling environmental temperatures and shorter days. Research on hibernating reptiles shows the body does not simply shut down. In Chinese soft-shelled turtles, fat stores shrink and liver lipid droplets decrease during hibernation, which means the animal is actively burning energy reserves the whole time [1]. Juvenile Chinese three-keeled pond turtles show clear phases of brumation onset, deep brumation, and gradual arousal that track water temperature [2]. Your tortoise is doing real physiological work in winter, even when it looks lifeless. Temperature and duration both matter. In common wall lizards, hibernation length changed antioxidant defenses in the liver and tail, while temperature had smaller effects [3]. This is one reason a warm, erratic winter is harder on a reptile than a steady cold one. ## Which Pet Tortoises Brumate? Species that evolved in places with cold winters usually brumate. Species from warm, tropical regions usually do not, and forcing them into cold can be fatal. | Species group | Typical brumation need | Notes for owners | |---|---|---| | Hermann's, Greek, marginated, Russian (Horsfield's) | Usually brumates | Mediterranean and steppe species. Plan a full pre-brumation season. | | Sulcata, leopard, red-footed, yellow-footed | Should not be cooled | Tropical or subtropical. Keep warm year round. | | Box turtles (Terrapene) | Usually brumates | Native North American species. Similar preparation rules apply. | | Juvenile or hatchling tortoises of any species | Often skipped | Small body mass loses heat and water fast. Many vets advise overwintering them warm for the first year or two. | If you are unsure what species you have, ask your veterinarian before you change any temperatures. If you keep a sulcata, see this [Sulcata Tortoise Care Guide](/knowledge/veterinary-medicine/reptile-care/sulcata-tortoise-care) and this guide to [Sulcata Tortoise Care: Pyramiding prevention high-humidity diet guide](/knowledge/veterinary-medicine/exotic-small-animals/sulcata-tortoise-care-pyramiding-prevention-high-humidity-diet-guide) for warm-housing basics. ## Is My Tortoise Trying to Hibernate? Owners often ask this in October, when a normally busy tortoise slows down. The signs overlap with illness, so read them carefully. Normal pre-brumation behavior includes eating less, basking less, sleeping in the hide more, and slowing down as nights get cooler. A tortoise that is simply cooling off will still have clear eyes, a firm shell, and a reasonable body weight. Concerning behavior includes weight loss, runny or foul droppings, discharge from the nose or eyes, open-mouth breathing, or a tortoise that stops eating while temperatures are still warm. Those are illness signs, not brumation signs. Weigh your tortoise every one to two weeks on a kitchen scale in grams. Write the numbers down. A steady small drop as appetite falls is expected. A rapid drop, or any drop in a tortoise that is still warm and active, needs a vet visit. ## How to Prepare a Tortoise for Brumation Preparation takes six to eight weeks. Rushing it is the most common cause of a bad outcome. ### Step 1: Book a pre-brumation exam Have a veterinarian examine your tortoise and check a fecal sample for parasites. A tortoise carrying a heavy parasite load can crash during brumation. Your vet will tell you whether your tortoise is a safe candidate. If any treatment is needed, it must be finished and the tortoise must be eating well again before cooling begins. ### Step 2: Confirm the tortoise is fit enough A tortoise should be at a stable, healthy weight before brumation. Ask your vet to help you judge body condition. Thin tortoises, tortoises with shell or respiratory disease, and tortoises that were recently imported or rehomed should overwinter warm instead. ### Step 3: Fast the tortoise Stop offering food about two to three weeks before cooling starts. The gut must be empty before brumation. Food left in the digestive tract can rot when metabolism drops. Keep fresh water available during the fast. ### Step 4: Cool gradually Lower the enclosure temperature slowly over two to three weeks. Do not drop from summer heat to winter cold in a few days. A gradual decline mimics the natural temperature curve that reptiles use to time brumation [2]. ### Step 5: Set the target temperature Most Mediterranean tortoises brumate safely between about 41 and 50 degrees Fahrenheit (5 to 10 degrees Celsius). Keep the range steady. A refrigerator dedicated to the tortoise, a cool garage, or a temperature-controlled cabinet works better than a spot that swings with outdoor weather. ### Step 6: Monitor through winter Weigh the tortoise every two to four weeks. Check the temperature daily with a digital thermometer. Handle the tortoise as little as possible, but do look at the eyes and nostrils each time you weigh it. ## Brumation Schedule and Checklist | Timeframe | Task | |---|---| | 8 weeks before cooling | Veterinary exam, fecal check, parasite treatment if needed | | 6 weeks before cooling | Confirm healthy weight and body condition | | 3 weeks before cooling | Stop all food, keep water available | | 2 to 3 weeks | Lower temperatures gradually to target range | | Every 2 to 4 weeks in brumation | Weigh the tortoise, record the number, check eyes and nostrils | | Daily | Check temperature with a digital thermometer | | End of winter | Warm gradually over 1 to 2 weeks, offer shallow water first, then small meals | For a deeper look at the physiology and the warm-housing alternative, read [Reptile Brumation: What Owners Need to Know](/knowledge/veterinary-medicine/reptile-care/reptile-brumation-guide). ## My Tortoise Won't Hibernate This is a common and frustrating problem. A tortoise that stays awake, paces, or keeps eating when temperatures drop may not be getting the right cues. Check these first: - Temperature is too warm or too unstable. A garage that warms in the afternoon sun will keep the tortoise semi-active. - Light cycle is too long. Aim for a natural winter photoperiod. - The tortoise is not empty. If it is still passing food, it will not settle. - The tortoise is sick. A low-grade infection can look like restlessness. A tortoise that will not settle is not automatically in danger, but it should be examined. A reptile that cannot complete brumation may burn through fat reserves while staying partly active, which is worse than either state alone. Research on hibernating lizards shows that warmer winter temperatures change hibernation depth and stress the animal's physiology [4]. If your tortoise is awake and losing weight, that is a veterinary problem. ## Signs That Something Is Wrong Call your veterinarian if you see any of these during or after brumation: - Weight loss of more than a small, steady amount, or any rapid loss - Nasal or eye discharge, wheezing, or open-mouth breathing - Swollen eyes, sunken eyes, or a soft shell - A tortoise that wakes mid-winter and stays awake - A tortoise that does not wake when temperatures rise - Sores, shell rot, or a foul smell - No appetite or no droppings for more than a week after full warming Post-brumation anorexia is a specific concern. A tortoise that wakes but will not eat needs prompt evaluation, fluid support, and a careful refeeding plan. See [Tortoise Post-Hibernation Anorexia: Evaluation, Fluid Support, and Refeeding](/knowledge/veterinary-medicine/reptile-care/tortoise-post-hibernation-anorexia-evaluation-fluid-support-refeeding). ## Common Mistakes Owners Make - Brumating a sick or underweight tortoise. This is the most dangerous mistake. - Skipping the fast. Food in the gut during brumation can cause serious problems. - Cooling too fast. A sudden drop shocks the body. - Using a spot with unstable temperatures. A shed or garage that swings from 35 to 60 degrees is not safe. - Forgetting to weigh the tortoise. You cannot judge brumation health by looking. - Waking the tortoise for baths or handling. This burns energy the tortoise needs. - Assuming every tortoise should brumate. Tropical species should stay warm. - Letting a tortoise brumate in its first year without veterinary advice. ## Setup Details That Matter Temperature control is the single most important piece of equipment. Use a digital thermometer with a probe inside the brumation box, not a wall thermometer across the room. Check it daily. The brumation container should be dark, ventilated, and escape proof. A plastic storage bin with air holes works well. Use a substrate that holds a little moisture, such as dampened paper towels or chemical-free soil, so the tortoise does not dehydrate. Keep a separate "hospital" enclosure ready at normal temperatures. If something goes wrong, you want to move the tortoise into warmth immediately without scrambling for equipment. Weigh your tortoise on the same scale every time. Record the date and weight. Bring that log to your veterinary visit. It is the most useful information you can provide. If you keep other reptiles, remember that brumation is not unique to tortoises. Turtles, snakes, and lizards all use it. For a related example in a different species, see [Hamster Care: Hibernation torpor vs hypothermia differential guide](/knowledge/veterinary-medicine/exotic-small-animals/hamster-care-hibernation-torpor-vs-hypothermia-differential-guide). ## Limitations and When to Contact a Veterinarian This article gives general guidance only. Every tortoise is an individual, and brumation decisions depend on species, age, weight, health history, and your local climate. Your veterinarian should make the final call for your tortoise. Contact a veterinarian the same day if your tortoise has nasal or eye discharge, open-mouth breathing, a sudden large weight drop, or swelling anywhere on the shell or limbs. Treat it as an emergency if your tortoise is unresponsive after warming, has labored breathing, is passing blood, or has been at brumation temperatures far below the safe range. Book a routine visit before brumation season starts, ideally in late summer or early fall. A pre-brumation exam and fecal check are the cheapest insurance you can buy. If your tortoise wakes mid-winter and will not resettle, or if it fails to wake in spring, call your veterinarian. Do not wait for warmer weather to fix the problem on its own. ## Frequently Asked Questions ### Do turtles hibernate? Turtles brumate, just like tortoises. They slow down and drop their metabolism in cold water or on land, and some species can tolerate being under ice for months. The physiology is similar, but the term for reptiles is brumation. ### Do tortoises brumate or hibernate? Tortoises brumate. Hibernation is the term for mammals. The two states look similar from the outside, but the triggers and the internal changes are different in reptiles. ### Is my tortoise trying to hibernate? If your tortoise is slowing down, eating less, and sleeping more as temperatures fall, it may be entering brumation. If it is losing weight quickly, has discharge, or is breathing oddly, that is illness and needs a vet. ### My tortoise won't hibernate. What should I do? First check the temperature, light cycle, and whether the tortoise is still passing food. If those are correct and the tortoise stays restless, have it examined. Restlessness in winter can be a sign of underlying disease. ### Does my tortoise need to hibernate? Not always. Tropical species such as sulcatas and red-footed tortoises should stay warm year round. For Mediterranean species, brumation is natural, but it is optional for many healthy pets kept indoors. Your veterinarian can help you decide. ## Related Articles - [Tortoise Post-Hibernation Anorexia: Evaluation, Fluid Support, and Refeeding](/knowledge/veterinary-medicine/reptile-care/tortoise-post-hibernation-anorexia-evaluation-fluid-support-refeeding) - [Reptile Brumation: What Owners Need to Know](/knowledge/veterinary-medicine/reptile-care/reptile-brumation-guide) - [Hamster Care: Hibernation torpor vs hypothermia differential guide](/knowledge/veterinary-medicine/exotic-small-animals/hamster-care-hibernation-torpor-vs-hypothermia-differential-guide) - [Sulcata Tortoise Care: Pyramiding prevention high-humidity diet guide](/knowledge/veterinary-medicine/exotic-small-animals/sulcata-tortoise-care-pyramiding-prevention-high-humidity-diet-guide) - [Sulcata Tortoise Care Guide](/knowledge/veterinary-medicine/reptile-care/sulcata-tortoise-care) - [Hermann's Tortoise Care Guide](/knowledge/veterinary-medicine/reptile-care/hermanns-tortoise-care) ## References 1. [Analysis of Lipid Metabolism in Adipose Tissue and Liver of Chinese Soft-Shelled Turtle Pelodiscus sinensis During Hibernation](https://pubmed.ncbi.nlm.nih.gov/39596192/). International journal of molecular sciences, 2024. 2. [Adaptations That Track Environmental Temperature Cues in Hibernation: Insights From Time-Series Transcriptomic Profiles in a Hibernating Freshwater Turtle](https://pubmed.ncbi.nlm.nih.gov/42383568/). Integrative zoology, 2026. 3. [Effects of hibernation temperature and duration on oxidative status in the common wall lizard (Podarcismuralis)](https://pubmed.ncbi.nlm.nih.gov/41702111/). Journal of thermal biology, 2026. 4. [Hibernating male lizards (Eremias argus) cleverly respond to insecticide exposure and warming temperatures: survival rate and physical condition cannot coexist](https://pubmed.ncbi.nlm.nih.gov/40513444/). The Science of the total environment, 2025. ## Further Reading - [Merck Veterinary Manual: Reptiles](https://www.merckvetmanual.com/all-other-pets/reptiles)