Mosquito Pass would fit the bill. Can be run either direction over the mountain from Leadville to Fairplay/Alma.
The real answer here is Red Cone. Its a little further away but absolutely worth it. You have to run it starting on the south side to reach the summit.
If its open, this is the one you dont want to miss. No matter how many times I have run it, the last 100 feet or so to the peak always raise the pucker factor a little.
Wheeler Lake trail is nearby also. Its out and back but totally worth it.
For the love of god be careful. Stay on the trail and dont press your luck in the snow. Shit goes sideways in a hurry.