Thanks for the tips. The floor is poured concrete, and the two bay garage is unheated but is under the house so it's often just above freezing. I need to corral the water around the tractor as I share the garage space with my wife (imagine!), and she has some storage containers in her half. It seems I spend an inordinate amount of time brushing snow from the machine and implement before pulling in rather than just letting it "drip dry" inside.
I like the idea of affixing a flexible berm around the perimeter of the tractor, leaving the one end open for sqeegeeing the snow melt out the door. But I can't find any commercial material for that purpose. I can investigate the garage door sealer strips, and I'll try an experimental bead of silicone to see how that works?
I found perforated snap together tiles which look great until you realize that A) they're extremely expensive, and B) they have no bottom tray which means it just melts through the tiles and out onto the floor underneath.
Any other ideas?