Peak 4620 is a backcountry snowshoe activation that can be done in the winter if you don't mind using a GPS and are comfortable with off-trail navigation. It's about 1.7 miles one way and 700 feet gain.

Park at the Frog Lake SnoPark, about 12 miles east of Government Camp on Highway 26 (in winter, an Oregon SnoPark Pass is required). Cross Highway 26 to the trailhead for Pacific Crest National Scenic Trail (PCT) - it's quite obscure in the winter but it starts near the highway sign for Frog Lake. Here's a spot where a GPS will be very useful. You will travel southwest along the general route of the PCT about 0.85 miles. Again, a GPS with the PCT marked will keep you on the right route.

Turn off the PCT near 45.220° -121.712° and go about 0.10 miles south to a road that will lead you more directly to summit. Continue 0.6 miles, mostly on this road - when the road turns to the right, head uphill to the summit. Again, a GPS will tell you where you find the summit as the AZ is roughly 300 meters in diameter. We found no T-Mobile cell service and surprisingly, no APRS coverage, so self-spotting was a problem.

On the hike down several of us had issues with muscle cramps, leading to our recommended SOTA vanity peak name of Cramp Butte.

For those that want to try this summit without snow, here's the trip report for a near drive-up experience: http://www.pnwsota.org/blog/k7atn/2014-may-20/peak-4620-or-may-2014.

Also accessed from the Frog Lake SnoPark is Frog Lake Buttes. It may be a bit much to do both summits during the shorter days of winter however: 
http://www.pnwsota.org/blog/k7atn/2013-january-27/frog-lake-buttes-or-j….