I did the winter Skyline loop shown on the MRNP Paradise winter recreation map at the link. It follows most of the summer trails shown on Gaia with a few deviations.
This is an incredible hike, but there are a lot of caveats. The first is that I was advised by the Ranger I spoke to that it should only be done on a low (green) avalanche danger day according to nwac.us, which is pretty rare. The loop crosses two avy slopes--one on the final ascent to Panorama Point (I hiked it clockwise) and one on the northeast corner of the loop, when it descends out of 7000' to the north of the Edith Creek basin.
Caveat #2: Traction on the descents. Since the avy danger was low on the day I hiked it, I wasn't overly worried about avalanches. But the traction on the two avy slopes was challenging. The snow was so firm that it was difficult for the teeth on my snowshoes to get a grip. Descending the second avy chute, I was getting so little traction that I decided to glissade. (Safety reminder--take off your snowshoes/spikes/crampons before glissading or you could break a bone, and use an ice axe to steer and brake.)
Caveat #3: Routefinding and ability to assess avy terrain is also required, since the winter route doesn't exactly follow the summer route. The portion between Panorama Point and the intersection with the Paradise Glacier trail is infrequently traveled, so there may be only one set of tracks to follow, if any. And of course as with all snowshoeing, the footprints you are following may or may not be correct.
Caveat #4: Weather. Most of this route is above treeline, and whiteouts are common. Have a plan for what to do if this happens. For me this meant carrying enough emergency gear so I could safely spend the night on the mountain if needed.
Caveat #5: The time window. Since the Longmire Gate doesn't open until 9, realistically you won't start before 10, and the Rangers advise you to get back to your car by 4 to make the gate closure at 5. I started at 1030 and got back at 330. I didn't stop for lunch on the hike, but getting set up for glissading slowed me down. As a backup I had gotten a $6 permit to camp in the Deadhorse Creek Basin in case I didn't make it back in time.
So, lots of caveats but nothing that can't be planned for. And it's worth it!
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