From my own experience Winter trailrunning will be done at a somewhat slower pace than on smoother gravel or dirt trails. That depends on the surface of course. Some of my fastest Quandary (Colorado Fourteener) ascents were done on mostly firmly packed snow. Something that you can do on snow that you can't do on more solid surfaces is churning uphill with your feet cranking away in circles while you barely move up a steep slope. It feels a lot like riding a mountain bike uphill with your feet spinning at a 100 rpm cadence while barely making forward progress.
I usually wear spiked running shoes. I've added 3/8" #6 hex head sheet metal screws to the bottom of some Hoka One One Mafate WP (waterproof) and a pair of Hoka One One Stinson Evo. The former have about 50 miles on them, and the latter had about 240 miles on them when I spiked them. I have a pair of Salomon Spikecross CS that are a more traditional style running shoe with solid lugs and embedded carbon steel spikes. These shoes have been pretty good in the dry snow of Quandary and up the Gulch Road, but the last time I did Mount Royal in melting slush they leaked horribly and I don't know if that was coming in through the top or through leaking seams that need to be sealed. I also use a pair of Pearl Izumi Trail N2 that are not spiked. If the traction and ice is an issue I can wear microspikes with them.
I have been running in the winter for about five years now, almost all at altitude in Summit County Colorado, near the ski resorts of Keystone and Breckenridge as well as the Fourteeners in the area, Grays, Torreys, and Quandary. It's an excellent way to get in shape for high peaks and I'm sure it was instrumental in my one-day climb of Orizaba with Todd, and my successful completion of the Elbrus Race 2013 Qualifier and Race, in spite of the stormy conditions.
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