One way to keep them coming around is a giant steaming pile of compost. They really like worms.

If the pile is big enough and has the right ingredients it will never freeze as long as you keep adding material to it periodically.

A bit of work in the beginning, but upkeep is minimal.

I start mine with restaurant leftovers, cover it with horse stall cleanup and then throw any sort of vegetation on top. Hogs, Fox and Yotes will all pay it regular visits.

Just be careful where you put it, they can start on fire. I've had mine smoking before.

You can also mix in some Oats, the heat from the compost will cause the Oats to sprout even in winter, Deer love the sprouts.