I've got a cheaper option for you than the tractor. Buy 4 cheap rims and 4 of these
Toss 'em on around Thanksgiving, and take them off around the first of April.
My VW Jetta Wagon (front wheel drive, 4.5" of ground clearance) drove thru about 3/8 mile of 20" deep snow on a gravel drive. FMC67693's wife had a heck of a time getting her car into their garage due to snow/ice and I pulled right up to it without slipping the tires. Once you have them on for a winter you'll never go thru another winter with summer shoes on again. He's been in the car a few times. PM him how they do in the snow/ice.
They'll last you about 3-4 winters depending on the miles that you drive. I average about 40K on a set before they need replacing. I don't run them all year long, they don't like the heat of summer.
The place is shaping up nicely! Be thankful that you aren't in the lake effect snow belt. South Bend this weekend got whacked with 38" of snow between Friday afternoon and Sunday morning.