How to Make a Humidity Box for Reptiles

A humidity box is a simple and effective way to provide supplemental moisture for reptiles and amphibians without increasing humidity throughout the entire enclosure. In addition to supporting proper hydration, a humidity box can serve as a secure hiding space, promote healthy shedding, and improve overall well-being.

Humidity boxes are especially helpful for reptiles that shed in pieces and during dry winter months, when indoor heating systems reduce ambient humidity.

What Is a Humidity Box Used For?

A properly maintained humidity box can:

• Support healthy and complete shedding

• Provide a moist retreat without soaking the entire habitat

• Serve as a hiding area for mental comfort

• Act as a pre-shed soaking area

Humidity boxes are commonly used for:

• Snakes (especially ball pythons)

• Iguanas

• Prehensile-tailed skinks

• Box turtles

• Some amphibians, such as tree frogs

Supplies You’ll Need

1. Moisture-Holding Substrate

Sphagnum Moss (Recommended)

• Sold dry in garden or houseplant sections

• Comes in long brown strands

• Holds moisture well and is easy to manage

Alternative: Vermiculite

• A granular soil additive found in garden stores

• Holds moisture well but can be messy

• Tends to stick to reptiles and spread throughout the enclosure

2. Plastic Box with Lid

• Food storage container, plastic shoe box, or sweater box

• Available at most discount or department stores

• Should be large enough for your pet to enter, turn around, and exit comfortably

• A snug fit is best—if the box is too large, pets may use it as a bathroom

How to Make the Humidity Box

Step 1: Create the Entrance

• Cut a single entry hole in one corner of the lid or on one end of the box

• The hole should be large enough for your pet to enter and exit easily

• Do not add extra holes, as this will allow moisture to escape too quickly

Step 2: Prepare the Substrate

Using Sphagnum Moss:

• Loosely pack dry moss into the box

• Add water until the moss is fully damp

• Allow it to sit for 10–15 minutes to absorb moisture

• Squeeze out excess water (like a sponge) so it is moist but not dripping

• Pour off any standing water, replace the moss, and secure the lid

Using Vermiculite:

• Fill the box about halfway

• Moisten thoroughly, ensuring it is damp but not saturated

Step 3: Place the Box in the Enclosure

• Position the box near a heat source

• No more than half of the box should be over the heat to prevent drying out

• If the box is too cool, your reptile may avoid it

• Place your pet in the box the first time, then allow them to use it as desired

Many reptiles will spend hours in the humidity box and then ignore it for long periods—this is normal. Let your pet decide when to use it.

Cleaning and Maintenance

• Check the box every 2–3 days for moisture and cleanliness

• Add water as needed to maintain humidity

• If the moss stays clean, it may last several weeks

  
  

Replace the substrate if you notice:

• Foul or stale odors

• Fecal material

• Food debris

Disinfecting the Box

• Soak the plastic box in a mild bleach solution for 30 minutes

• Rinse thoroughly with clean water

• Allow to dry and refill with fresh substrate

Our Recommendation

Humidity boxes are an easy, affordable way to improve your reptile or amphibian’s comfort and health—especially during shedding or dry indoor conditions. When used properly, they can significantly reduce shedding problems and stress.

If you’re unsure whether a humidity box is appropriate for your pet or need help adjusting enclosure humidity, our veterinary team is happy to help you create the ideal habitat for your reptile or amphibian.