Ainapo Trail to Mauna Loa Observatory

The Ainapo Trail to Mauna Loa Observatory is a 39.6 km trail that starts in Volcano, Hawaiʻi County, Hawaii. Based on our data, the hike is graded as Extra 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 3 days. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.