I almost made it over Weston Pass in the winter. The deep ice finally got me. Had to dig out and go back. ;)
A paved pass closed for the winter is Independence Pass that crosses from Leadville to Aspen. The east side of the pass is no big deal. On the west side though, several miles at the top are notched into the side of a cliff. It's about 1 3/4 lanes wide and the cliff overhangs the road forming a roof. The pass is generally closed by snow and ice from about early to mid October thru early July.
North of Fairplay is Cinnamon Pass. Like Weston Pass, Cinnamon also drops down on it's west side into Leadville area. I've called the Forest Service several times in summers and always was advised to avoid the pass because of ice. I think a mule would work better than a 4wd.
Cinnamon Pass was the old postal route between Leadville and Fairplay. A postman and a couple of mules. IIRC, a number of the silver and lead mines were on the route, especially on the Leadville side.
Next time you're in Leadville, there's an old saloon there that Doc Holiday is reputed to have shot someone in a poker game. Belly up to the bar for a beer or whiskey. If a person were to order a foofoo drink with a little umbrella, I am fairly certain a ghost would haunt the person right out of town.