We're so glad we packed light! We were the first visitors to the lookout in ten days and ended up breaking trail the entire way up through a foot plus of fresh snow (at the bottom) and far more at the top. The climb took us 3 hours and 40 mins, with minimal breaks due to the cold -- our 9 year dog was a real trouper. Snowshoes or skis are a must in mid-winter, and if you live at sea level like we do, don't underestimate the impact the elevation will have on your energy level/mood.
A quick note re: snow piling up in the woodshed and outhouse. We noticed that the visitors after us speculated in their review that the doors had possibly been left open. We discovered on our second day at the lookout that strong winds at the summit actually blow the snow inside both buildings -- through the slats in the woodshed and through the air vent in the outhouse, so in a storm you'll have to regularly clear them out. FYI there's a good shovel inside the woodshed that *might* be hidden by a drift of snow when you get there -- it'll make those tasks way easier. Anyhow, we had a memorable & cozy time and hopefully when we return we'll actually catch some views! A real gem of a spot.
One last note -- I believe that FR 28 gets plowed fairly regularly, but it didn't get plowed during our two-night stay, so we ended up driving out in ten inches of new snow. Just keep that in mind if you have a low-clearance vehicle.