I'll preface this with saying I have yet to incubate colubrid eggs (hopefully next year), I do have Kathy and Bill Love's book, Corn Snakes: The Complete Owner's Guide.


She recommends and enclosed container with a few scattered holes (no bigger than 1/8 inch) with the goal of keeping humidity at 100%. The container should be at least 4 inches deep (3 inches for the incubation material and an extra inch or more to spare on al sides of the eggs. They use both sphagnum moss and coarse vermiculite as incubation mediums, though prefer to use the moss. They wet it completely and squeeze out the excess water by hand to for the right moisture level (wet but not wet enough to wring water out of it).

They lay an inch of moss then place the eggs (which are usually laid in a vertical mass) in and surround and cover the eggs with at least an inch of moss on all sides. A suggestion is to pack an 1 inch layer of moss which you can lay overtop of the eggs and pull back once week to check on humidity or the eggs. (If using vermiculite a papertowel covering them will suffice, though I don't see why this wouldn't work with moss as well). Note: the moss with lightly stain the eggs brown and there is no need to be concerned.

Eggs hatch in approximately 9 weeks at 85 degrees F. If there is some fluctuating of temps from 70 - 90 degrees it is usually tolerable for the eggs (better to be to high than low).

Anyways, that's the short version from the book, hope it helps!