A naturalist near me said that when a fisher moves into a neighborhood, it sticks around until the food supply dries up; i.e. when all the cats have been eaten or moved indoors! That was about the time I lost one cat, and found a neighbor's cat disembowelled in the woods near our house.
I moved my kitties back indoors late this past fall when a fisher was seen. And now that it's a bit warmer they're eager to go out, but I think not, probably.
Haven't seen any woodchucks yet!