I'm interested in a Northern Tier or TransAm (or a combination) going from East to West. When do people typically start a West-bound ride?
I currently live in Colorado and am aware of snow in the mountains making roads impassable until May or even June (and the Going to the Sun Rd in Glacier NP sometimes doesn't open until July...). Obviously starting in the Northeast means you can start earlier and you really shouldn't hit any high elevation roads until Colorado or Montana (depending on the route).
So, when is a reasonable time to start, with an emphasis on earlier is better (within reason)?