Corn snakes reach sexual maturity between two and three years of age (18 to 36 months).

Breeding season is between March and May. After mating, it takes about 40 days for fertilized eggs to be laid.  Corn snakes are oviparous and lay a clutch of 10-30 eggs in late May to early July.  Eggs are laid in rotting stumps, piles of decaying vegetation, or other similar locations where there is sufficient heat and humidity to incubate them. Gestation is 60-65 days provided that the average ambient temperature maintains about 82 degrees Fahrenheit.  The adult snakes do not care for the eggs. 

The eggs hatch sometime in July through September. Hatchlings are 9 to 15 inches (22 to 38 cm) long lack much of the bright coloration found on adults.
Corn snakes are one of the easiest snakes to breed in captivity. Consult a breeder or a good corn snake book if and when you are ready to breed your snake.  Remember, after the offspring hatch they are an enormous responsibility and if you don't know what you will do with the babies, don't breed the adults.

Breeding is not necessary for their health and you don't want to be responsible for the deaths of the babies because you were unprepared to maintain them or otherwise couldn't find a good home for them.