Fencing is the standard recommendation and the only thing that seems to consistently work effectively.

There have been many discussions here about keeping various varmints - rabbits, gophers, woodchucks, deer, armadillos, squirrels, etc. - out of the garden that the search will pull up for you. They have reports on other efforts like repellants, motion detectors, sprinklers, various types of lights, etc. but it always comes back to a fence for the best results.

Dave

Fence , I second.
For rabbits a couple feet high wire chicken net will do. Make sue it is galvanized and buried at least 6" deep, so the rabbits cannot tunnel under it. They will chew plastic material.

The next option is a gun.
Yet another option is TRAP.

You may also try yelling, chasing and throwing stones. hahaha