Hibernation, or sometimes called brumation, is an important part of the natural cycle of desert tortoises, box turtles, and many other turtles and tortoises kept as pets. Make sure you know if your turtle or tortoise is supposed to hibernate or not.
Hibernation/brumation is an adaptation used by many species around the world, including many tortoise species, to survive cold weather. Like all poikilotherms (cold-blooded), tortoises are unable to produce their own body heat. As the temperatures outside fall their metabolism slows. A slower metabolism means every physiologic activity, from digestion or reproduction, slows too.
Hibernation is natural and recommended for healthy tortoises. However, it’s extremely important to point out that not all tortoise species can or do hibernate. Before you prepare your pet for hibernation make sure to establish that it will hibernate. For species that do, hibernation is part of their yearly life cycle and many tortoises can even become ill if prevented from doing so year after year.
While hibernation is natural and healthy, sick tortoises should never be allowed to hibernate. For a sick individual, hibernation can be seriously dangerous and potentially deadly. To survive hibernation a tortoise needs good fat and water reserves. Sick tortoises often aren’t eating well and thus not storing the energy they’ll need for successful hibernation. In addition, a tortoise’s immune system slows during hibernation. A sick tortoise won’t be able to adequately fight off infection.
Before hibernation, every tortoise should be examined by a qualified veterinarian to assure they are healthy. Your veterinarian will check for signs of infection (i.e. runny nose or eyes, coughing, respiratory difficulty, etc.) and assess their body condition. Often veterinarians will recommend tests such as checking a fecal sample for parasites, blood work to check for infections and assess overall organ function, and radiographs to check for bladder stones or retained eggs.
We strongly recommend an annual pre-hibernation exam between late August and mid-September to ensure that your turtle or tortoise is healthy and ready for hibernation. We also recommend post-hibernation exams to ensure they have remained healthy upon waking.
Once your pet has passed their physical exam, it’s time to prepare them for hibernation. Monitor your tortoise closely as fall approaches. Usually starting in late September or early October, as the nights start to cool into the 60s, you will notice your outdoor tortoise becoming less active. At this time stop feeding your tortoise any supplemental produce (i.e. Kale, Lettuces, Collard Greens, etc.). Allowing them to eat non-produce and natural or environmental foods is harmless as they typically stop eating before hibernation as part of the cycle anyway. During this time it is important to soak your tortoise once weekly in a shallow container. This will help them to build up water reserves and stimulate them to empty their bladder and bowels before they hibernate.
As the temperatures continue to drop it will stimulate your tortoise to seek a hibernaculum, an appropriate shelter in which to hibernate. You can provide one by creating and constructing an artificial burrow to insulate the tortoise from the cold and protect them from getting wet. Adding hay or straw into the burrow can further increase the insulation. Click here for a diagram on building an artificial burrow for your tortoise.
Most tortoises will hibernate once ground temperatures remain at or below 50°F degrees. An easy way to monitor ground temperatures is by using a simple kitchen thermometer stuck into the soil of your tortoise’s burrow. It is important to make sure ground temperatures do not exceed 60 degrees for an extended period of time, as these warmer temperatures will cause your tortoise to burn through its fat reserves too quickly. Ground temperatures below 39°F degrees are also dangerous and can result in tissue and eye damage and death. If ground temperatures exceed 60 degrees for an extended period or drop below 39 degrees you should bring your tortoise indoors forgoing hibernation, relocate them to a more appropriate area of the yard, move them into an insulated box in a cool area of the house or garage, or hibernate them artificially in a refrigerator.
It is very important to check your tortoise occasionally, at least once a month, to make sure hibernation is going well. Tortoises should only be brought out of hibernation and be examined by a veterinarian if they show any signs of illness, are found attempting to bask on cold days, or remain active within their burrow.
WHAT IF MY TORTOISE IS NOT ONE THAT HIBERNATES?
For tortoises that do not hibernate, they need to be supplied with a heated shelter. For more information on how to provide your tortoise with one click here.
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