Get ready for one of the most spectacular autumn displays in Breckenridge on the Aspen Alley Trail. This hike is famous for a reason, especially in mid-to-late September when you'll be walking through a breathtaking tunnel of golden aspens. The trail itself is a 2.5-mile out-and-back journey, which you can start from the top near Boreas Pass for an easier downhill walk, or begin near the Sawmill Museum for a more challenging uphill climb first. Either way, the trailhead is just a few steps from the small parking area, immersing you in vibrant fall color almost immediately.