How Many Times a Year do Corn Snakes Lay Eggs?

If you are breeding corn snakes or just curious about their reproductive habits, one of the basic questions you will want answered is how often they lay eggs. Corn snakes are one of the most popular pet snake species in the world, and their breeding is well understood thanks to decades of captive breeding by enthusiasts. Here is what you need to know about corn snake egg laying.

How Often Do Corn Snakes Lay Eggs?

Corn snakes typically lay eggs once per year, usually in late spring or early summer. In the wild, their breeding cycle is tied to seasonal temperature changes. They breed in the spring after emerging from brumation (the reptile equivalent of hibernation), and females lay their eggs about 4 to 6 weeks after successful mating. In captivity, this cycle can be replicated by cooling the snakes during the winter months and warming them back up in spring.

Some corn snakes can produce a second clutch of eggs in the same year, though this is not common and is generally not recommended by experienced breeders. A second clutch puts significant physical strain on the female, depleting her fat reserves and calcium stores. Most breeders allow their females to breed only once per year to maintain their health and longevity.

How Many Eggs Do They Lay?

A typical corn snake clutch contains 10 to 30 eggs, though the exact number varies based on the female’s size, age, health, and genetics. First time mothers usually lay smaller clutches of 8 to 15 eggs. Larger, more experienced females can produce clutches of 20 to 30 eggs. Very rarely, an exceptionally large female may lay even more.

Not all eggs in a clutch will necessarily be fertile. Even with a successful mating, it is normal for a few eggs to be infertile (often called “slugs”). Fertile eggs are plump, white, and slightly soft, while infertile eggs tend to be smaller, yellowish, and may collapse or mold within a few days of being laid.

The Egg Laying Process

When a female corn snake is ready to lay (also called “gravid”), she will show some telltale signs. She may refuse food in the weeks leading up to egg laying, her body will look noticeably swollen in the mid section, and she will become more restless, actively searching her enclosure for a suitable nesting spot.

Providing a nesting box is important for gravid corn snakes. A plastic container filled with damp sphagnum moss or vermiculite gives the female a dark, humid space to deposit her eggs. Without an appropriate nesting spot, some females will hold their eggs too long (a condition called egg binding) or deposit them in unsuitable locations within the enclosure.

The actual egg laying process usually takes a few hours. The female will coil around in the nesting box and deposit eggs one at a time or in small groups. Once she is finished, she will leave the eggs and show no further interest in them. Unlike some python species, corn snakes do not brood or protect their eggs.

Incubating Corn Snake Eggs

After the eggs are laid, they need to be carefully transferred to an incubator. Corn snake eggs should be incubated at 78 to 84 degrees Fahrenheit with high humidity (around 90 percent). Vermiculite mixed with water at a 1:1 ratio by weight is the most commonly used incubation substrate.

Handle the eggs gently and try not to rotate them, as the embryo attaches to the top of the egg within the first day or two and rotating can be fatal. If eggs are stuck together (which is common), do not try to separate them. The eggs will hatch in about 55 to 65 days at proper temperatures, with baby corn snakes using an egg tooth to slit the shell and emerge over a period of hours to a day.

Can Female Corn Snakes Lay Eggs Without a Male?

Yes, female corn snakes can lay infertile eggs even without mating with a male. These infertile eggs (slugs) will not develop into baby snakes but are a normal part of the reproductive cycle. If your female corn snake lays eggs unexpectedly, they are almost certainly infertile if she has not been with a male.