Coming soon (as in tomorrow!), the Colorado Trail a ~500 route that goes from just outside Denver, Colorado across the state to Durango. No permits are necessary and there are many places along the way to resupply, typically every 3-5 days.
There is a fairly short window of time to hike the whole trail as snow often presents a serious challenge well into June and some years well into July. Delay too long, and come September early season snowstorms are not uncommon.
The biggest challenges for a hike like this are: the altitude (30% less oxygen at the high points ), afternoon electrical storms with monsoon rains and hail (especially above tree line), wildfire closures (currently the last 70 miles are closed…just reopened!), and figuring out how to get home (not much public transportation and hard to nail down my timing 3 weeks out)
Some great resources to find out more about the trail are: The Colorado Trail Foundation and blogger extraordinaire, PMags
Cell service is spotty, especially the last half of the route, so don’t despair if there are not daily blog posts coming your way.