Running in Colorado

Colorado’s temperature swings between a cold dawn start and a sunny finish can catch even experienced runners off guard. Here’s the layering system that handles it, season by season.

The foothills just west of Denver are a different sport from a park loop. Here’s what a road runner needs to know before the first trail run in the mountains.

Denver summers are warm, sunny, and reliably stormy by afternoon. Run early, respect the altitude sun, and get off exposed ground before the lightning builds.

Denver winters are cold, dry, and brighter than most people expect. Here’s how to keep running outside through them: what to wear, where to watch your footing, and when the treadmill is the honest call.

New to Denver and your running suddenly feels brutal? That’s normal, and temporary. Here’s a calm first-month plan for the altitude, the routes, and your first race here.

Denver runs well. Flat lake loops, long car-free trails, and the foothills a short drive west. Here’s how to pick a route by what you actually want from the run.

At a mile up, the air holds less oxygen, and your running feels it. Here’s what altitude actually does to your pace, how long it takes to adjust, and how to train around it.