This thread is 19 years old but since no one talked about Crested Butte, heck, I’ll bite.
Crested Butte has become famous for mountain biking with hundreds of miles of single track (including Gunnison). It turns out that a lot of those trails are great for running, particularly if your a trail runner at heart and run early in the morning before the mountain bikers take over.
For those of us more interested in train for road races or XC, there’s a lot of other great terrain.
For example, we have a version of Magnolia Road called Gothic Road. It’s much more scenic than Mags since it meanders through the Elk Mountains canyons, passing by several streams and lakes. It’s a 2-car wide dirt road that’s not steep, but it does start at an elevation of 9400’ and undulates to over 11,000’ in the first 9 miles. You can go much further…but that’s a hell of a round trip!
We’ve got a few other dirt road out ‘n backs where you can get in 10+ miles before it gets too steep. The base elevation here is 8600’ to 8800’, so you’ll be spending lots of time in the 9000’ to 10,000’ range.
There’s too much snow to run on those trails between mid-November to April…but still great for aerobic development on XC skis. If you come in late June the wildflowers are blooming and it’s right up there with the Swiss alps for beauty.
I’ve never been a mountain runner, so I was surprised how approachable the 6.5 mile run up to the top of Mt. Crested Butte Resort is- gentle single tracks and Cat Tracks. Note: the last 200m is a rock scramble if you want to make it to the summit.
The closest track is a 25 minute easy drive down to Western Colorado University in Gunnison. It’s at 7700’ but feels low enough to do tempo/threshold work once you’re fully acclimated to CB. (The also school has an indoor 200m track).
CB South has a pretty flat, 2-mile street loop that’s plowed and runnable year-around. There’s a lot more flat pavement and dirt trails down in Gunnison.
In short: once your acclimated, the training here for road runners (and of course trail runners) is pretty great…at least from April to November.