If it is not very deep they can. but they are more likly to claw chew threw the fencing first weak grad fencing wont hold them out for long.
fix it by placing rocks around the fence.
Very nice thank you for the good advise . I am a little worried about it I think the people next to me have a raccoon that is living on top of there wood shed and the shed is just on the other side of the fence from my coop .