I’ve been wanting to get to Colorado for some high altitude cold training, since Utah has been so warm and dry so far this winter (aside from nice ice climbing I got in). Earlier today I got a chance to run at 5 degrees F on a dirt road for emergency and maintenance access to the back lifts at Keystone Resort. The Keystone Gulch Road starts at about 9,240′ and at my 2.5 mile turnaround point was 9,850′ for a total of approximately 600′ of gain and loss. Enough stats though, and since a friend on the net asked me about layering for winter running, here’s how I approached running…