Grow Out Enclosures

Grow out enclosures are the intermediate housing step that takes a young snake from its hatchling setup into something larger without jumping straight to a full adult enclosure. This matters more than most new keepers realize because a hatchling that outgrows its first tub but gets dropped into a four-foot enclosure often stops eating, hides constantly, and shows stress behaviors that can take weeks to resolve. The grow out phase exists to match enclosure size to the snake's current body size and confidence level, stepping up gradually as the animal grows.

Snakes are not like fish where you can buy the big tank first and let them grow into it. A young corn snake in an adult-sized enclosure has too much open space to patrol, cannot find its hides efficiently, and often struggles to locate its water bowl consistently. The result is a snake that feels exposed and insecure, which translates directly into feeding refusal and defensive behavior. Grow out enclosures solve this by keeping the environment manageable for a young animal while still providing enough room for healthy movement and thermoregulation.

The grow out phase typically spans from the time a snake outgrows its hatchling tub, usually around three to six months of age depending on species and growth rate, until the animal is large enough and confident enough to transition into permanent adult housing. For fast-growing species like common boas or carpet pythons, this phase might only last six months. For slower growers like ball pythons, the grow out stage can stretch past a year. The timing depends entirely on the individual animal's size and behavior rather than arbitrary age milestones.

A common misconception is that grow out enclosures are unnecessary expenses that duplicate what the adult enclosure will eventually provide. In practice, the opposite is true. Keepers who skip the grow out phase often deal with prolonged feeding strikes, higher veterinary costs from stress-related health issues, and a snake that takes much longer to settle into its permanent home because it was overwhelmed during a critical developmental period.

This article walks through what grow out enclosures are, how to set them up properly, when to size up, and how to make the transition smooth for your snake at every stage.

Grow out enclosures come in several forms, and the best choice depends on your species, your available space, and how many animals you are raising simultaneously. The most common options are plastic storage tubs with ventilation holes, small PVC enclosures in the 24 to 36 inch range, and small glass terrariums. Each has advantages worth considering based on your situation.

Plastic tubs are the workhorse of grow out housing for good reason. They are inexpensive, stackable, easy to clean, hold humidity well with minimal modification, and come in a wide range of sizes that let you step up gradually as your snake grows. A six-quart tub works for most hatchlings, a 15-quart for juveniles, and a 28 to 32-quart for sub-adults before they transition to adult enclosures. The main drawback is visibility since you cannot observe your snake without opening the tub, but for a grow out setup where the priority is the snake's comfort rather than display, this is a minor trade-off. Tubs also make it easier to manage multiple animals since they stack neatly on shelving units and each one can be maintained independently without disturbing the others.

Small PVC enclosures offer a more polished version of the tub approach with better access, built-in ventilation, and more consistent heating options. These work well for keepers raising one or two snakes who want a cleaner setup than plastic tubs without investing in full-sized adult enclosures yet. PVC holds heat and humidity effectively and front-opening doors reduce the stress of top-access feeding and maintenance that some species respond poorly to.

Temperature management in grow out enclosures follows the same principles as any snake housing. You still need a warm side and a cool side with a thermostat controlling the heat source. Under-tub heat mats work well for plastic tubs when placed under one end to create a gradient. The warm side should match your species requirements, typically 85 to 90 degrees for most commonly kept species, with the cool side naturally falling to the mid-70s. Smaller enclosures heat up faster and can overshoot temperatures more easily, making a thermostat even more critical at this stage than in a large adult enclosure where thermal mass provides some buffer.

Humidity and hide placement in grow out enclosures require the same attention as adult setups despite the smaller scale. Your snake still needs a warm-side hide and a cool-side hide sized so the animal can curl up inside with its body touching the walls, which provides the sense of security that keeps stress low. Water bowls should be appropriately sized so the snake can soak if needed but not so large that a small snake risks drowning or the bowl dominates the available floor space.

Setting up a grow out enclosure starts with choosing the right size for your snake's current body. A good rule of thumb is that the enclosure's length plus width should roughly equal the snake's total length. This gives the animal enough room to stretch, move between hides, and thermoregulate without creating so much open space that it feels exposed. When the snake's body length exceeds the enclosure's length plus width, it is time to size up.

Heat source placement in smaller enclosures needs more precision than in larger setups because you have less room to create a gradient. Place the heat mat or heat source under one third of the enclosure floor on the warm end, leaving the remaining two thirds to naturally cool. Check surface temperatures with an infrared temperature gun rather than relying solely on the thermostat probe, which reads air temperature and can differ significantly from the surface temperature your snake actually contacts inside its hide.

Cleaning grow out enclosures is straightforward and should happen on a consistent schedule. Spot clean waste immediately, refresh water daily, and do a full substrate change every two to three weeks for paper towel or newspaper substrates, or every four to six weeks for coconut fiber or similar loose substrates. The smaller volume means waste concentrates faster than in adult enclosures, so staying on top of cleaning prevents bacterial buildup that young snakes are particularly susceptible to.

Knowing when to upgrade is one of the most practical skills in the grow out process. Watch for your snake consistently resting in stretched-out positions that span the full length of the enclosure, outgrowing its hides so that significant portions of its body stick out, or showing increased restlessness and nose-rubbing along the enclosure edges. These behaviors signal that the current enclosure no longer meets the snake's spatial needs.

The transition between grow out sizes should be as low-stress as possible. Move the snake's existing hides and water bowl into the new enclosure so familiar scent markers carry over. Set up the new enclosure and let it stabilize for temperature and humidity for at least 24 hours before moving the snake in. Avoid handling the snake for a few days after the move to let it settle.

Escape prevention in grow out enclosures deserves special attention because small snakes are dramatically better at finding and exploiting gaps than adults. A hatchling corn snake can push through ventilation holes that look impossibly small, and juvenile ball pythons are strong enough to pop poorly secured tub lids. Every ventilation hole in a plastic tub should be smaller than the snake's head at its widest point, and lids need clips, weights, or locking mechanisms that the snake cannot defeat by pushing upward. Check closures every time you finish maintenance because a lid that is almost latched is not latched.

Heating safety becomes more critical in smaller enclosures because there is less margin for error. A heat mat that overshoots by five degrees in a large adult enclosure might still leave safe zones for the snake to retreat to, but the same overshoot in a small grow out tub can make the entire warm side dangerously hot with nowhere for the snake to escape the heat. A thermostat is absolutely mandatory, and a secondary check with an infrared temperature gun at least weekly catches thermostat failures before they harm your snake.

Ventilation in plastic tub setups requires a deliberate balance between airflow and humidity retention. Too few ventilation holes create stagnant air conditions that promote respiratory infections and mold growth on substrate. Too many holes make humidity impossible to maintain. A good starting point is a row of small holes along the upper portion of each long side of the tub, which allows warm air to rise and exit while cooler, more humid air settles near the snake's level. Adjust by adding or covering holes based on your humidity readings.

Keep grow out enclosures in a location where other household pets cannot access them. A tub lid that holds against a snake pushing from inside may not withstand a curious cat pawing from outside. Elevated shelving, a dedicated room, or a rack system all provide protection. Ensure the location is also away from direct sunlight, heating vents, and drafty windows that can create temperature swings the thermostat struggles to manage in small enclosures.

Never house multiple young snakes together in a single grow out enclosure. The temptation to save space by combining two hatchlings in one tub leads to stress, competition for hides and warm spots, potential cannibalism in some species, and difficulty monitoring individual feeding and health. Each snake needs its own enclosure from day one.

Ball python grow out enclosures need to emphasize security and humidity above all else. Juvenile ball pythons are notorious for going off feed when they feel exposed, so a tub with snug-fitting hides on both ends, minimal open floor space, and humidity in the 60 to 70 percent range sets them up for consistent feeding from the start. A 15-quart tub works for most juvenile ball pythons, stepping up to a 28 to 32-quart as they approach 200 to 300 grams, and then transitioning to adult housing once they reach around 500 to 700 grams depending on the enclosure size available.

Corn snakes and king snakes grow faster than ball pythons and are considerably more active, which means they outgrow their grow out enclosures more quickly and benefit from slightly larger setups at each stage. These colubrids are also the most likely to escape from improperly secured enclosures, so lid security is the top priority. A juvenile corn snake in a 15-quart tub with a climbing branch and two hides will thrive, but check that lid every single time because if there is a way out, a colubrid will find it.

Boa constrictors grow rapidly and can move through grow out stages faster than keepers expect. A hatchling boa that fits comfortably in a six-quart tub at birth may need a 28-quart within three months and a full transition to a larger juvenile enclosure by six to eight months. Plan your grow out sizes in advance and have the next enclosure ready before you need it, because boas that outgrow their housing tend to become restless and nippy.

Arboreal species like green tree pythons and Amazon tree boas need grow out enclosures that provide vertical space and perching even at small sizes. A small front-opening PVC enclosure or a modified deli cup with a thin perch works for neonates, stepping up to a small arboreal enclosure as the snake grows. The key difference from terrestrial species is that floor space matters less than perch availability and vertical room. Make sure perches are thin enough for the juvenile to grip comfortably, since a thick adult-sized perch in a grow out enclosure is essentially useless to a tiny snake.

Grow out enclosures exist for one simple reason, which is that young snakes do better in appropriately sized spaces that match their current body and confidence level rather than being overwhelmed by adult-sized housing they have not grown into yet. The principle is the same whether you are raising a ball python, a corn snake, a boa, or an arboreal species. Match the enclosure to the snake, provide a proper thermal gradient with a thermostat, include hides on both the warm and cool sides, maintain appropriate humidity, and secure the enclosure against escape. These basics do not change just because the enclosure is smaller. If anything, they matter more in smaller setups because young snakes are more vulnerable to temperature swings, dehydration, and stress than established adults with reserves to draw on.

The most important thing to remember about grow out enclosures is that they are transitional by design. You should be planning the next size up before your snake needs it rather than scrambling to find a larger enclosure after the snake has already outgrown its current one. Watch your snake's behavior and body size regularly, and when you see signs that the current enclosure is too small, have the next setup ready to go. A smooth, planned transition is always better for the snake than an emergency upgrade. Keep a grow out schedule in mind based on your species, knowing that ball pythons may stay in each size for months while boas and colubrids can blow through a tub size in weeks during growth spurts.

Common mistakes during the grow out phase include housing young snakes in enclosures that are too large too soon, skipping thermostats because the enclosure is small, neglecting humidity because tubs seem simple, and housing multiple juveniles together to save space. Every one of these shortcuts creates problems that cost more time, money, and animal welfare than doing it right from the start. A thermostat costs less than a veterinary visit for burns. Separate enclosures cost less than treating a snake that was bitten by a tankmate. The keeper who cuts corners during grow out ends up spending more in the long run than the keeper who invests in proper setups from the beginning, and the animals under their care show the difference in feeding response, temperament, and overall health.

Grow out housing is not glamorous and nobody keeps snakes because they enjoy setting up plastic tubs. But this phase of keeping is where you build the foundation for a healthy, well-adjusted adult snake that feeds reliably, sheds cleanly, and tolerates handling without defensive behavior. The keepers who invest attention in getting the grow out phase right consistently end up with better animals than those who rush through it. Young snakes that feel secure in their environment during these formative months carry that confidence forward into adulthood, feeding more willingly, reacting less defensively to routine maintenance, and generally being more pleasant animals to work with. Take your time, size up gradually, and let your snake tell you when it is ready for the next step.