Trickle/ maintainer is the best winter (freezing) solution in my opinion. I don’t need it for my tractor. I’ll use my tractor during winter because once deck is off I can really make use of it to haul my small trailer and pickup fallen limbs.
I’ll use mine in fall/winter to drag tarps full of leaves to the woods. I never disconnect the battery and if it doesn’t start in spring ( but it usually does) I charge it. Harbor Freight sells an inexpensive trickle maintainer I use on grandma’s car which rarely gets driven.