Q. How deep do worms dig into the Earth?
A. Some species of worms can go as far as six feet deep. Sometimes there is a shallow upper layer, some rock and better soil beneath. Worms can go several feet is they need to get to the better-developed soil. Also, during winter, worms tend to migrate downward, below the frost line. But worms usually tend to lay their eggs in the upper 12 inches of soil. Incidentally, one thing that all worms have in common is that they are longer than they are wide, and they have no backbone.