Any snake 36 inches long or less should live comfortably in that size enclosure. There is an old rule of thumb that the length and width of the enclosure should be the same length or less than the snake being kept in it. Therefore, an 18x18 enclosure (height is not that big a factor) can house up to a 36 inch, or three foot snake. Smaller corns, mountain kings, thayeri kings, etc. should live comfortably in a cage that size, are very to moderately easy to keep, and are generally docile and good natured once accustomed to handling.

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