Chasm Lake via Longs Peak Trailhead

The 4-mile trail climbs around 2500ft from the Longs Peak trailhead and starts by winding through dense forest. In the morning darkness, trudging through thick trees isn’t the most exciting, but when you finally climb out above treeline, the massive profile of Longs and the slowly growing light on the horizon is a welcome sight.

Make sure you know your hiking speed and leave early enough to arrive at the lake for the classic 'Sunrise hitting Longs Peak' shot! If you've got the energy to spare after taking in the sunrise, backtrack a little back to East Longs Peak Trail and head up to the peak through the Keyhole route. This will tack on another 5.5 miles and add an additional 2500' in elevation, so make sure you're ready!

For the winter, be prepared with microspikes or snowshoes depending on the conditions. 

TIMED ENTRY

To manage crowding and protect natural resources, Rocky Mountain National Park requires timed entry reservations during peak season (typically from late May through mid-October). Reservations are required daily from 9 a.m. to 2 p.m. for most areas of the park, with two options: “Park Access + Bear Lake Road” and “Park Access (excluding Bear Lake Road).” You’ll also need a park entrance pass (such as a 1-day, 7-day, or Interagency Annual Pass) in addition to your timed entry reservation. For current dates, details, and to reserve your spot, visit the NPS timed entry page or go directly to Recreation.gov to book.