Mauna Loa Summit via Observatory Trail

The Mauna Loa Summit via Observatory Trail is a 20.5 km trail that starts in , Hawaiʻi County, Hawaii. Based on our data, the hike is graded as Difficult. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates. This hike can be completed in approx 5 hrs 29 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.