Try fourteeners.com for more info. I havn't been to the Elks that time of year, but I would guess the aproaches for most of those peaks like Snowmass would all be snow travel, including the trail portions.( Depends on snow year) Also you are looking at a 4/5 hour drive from Denver. there are 14ers that are much closer, and easier to climb. By easier I mean not multi day excusions. Quandary, sherman, Grays, Torries, Evans, Shavano,and Pikes are all good early season climbs.