If you've ever had a gardening project ruined by pesky rabbits, you might have wondered just how deep their holes can be. While every rabbit hole is different, they all have one thing in common: they're deeper than you might think . A rabbit's burrow can extend six feet underground and span up to 30 feet in length. The main tunnel is typically around two feet wide, but it can be as large as four feet in diameter. A rabbit hole usually has multiple entrances and exits, and it is often lined with soft materials like grass or fur to keep the rabbits warm and comfortable.