Hiking Haleakala National Park stretches from the rugged Kipahulu coastline up through rainforest and shrubland to the summit of the volcano. Much of the rainforest and upper slopes are designated wilderness, ensuring that the primeval character of the area will remain. Renewed volcanic activity has partially filled in the valley with cinder cones and lava flows, which can be viewed from the Haleakala Visitor Center if weather permits. To experience different perspectives of the Park, plan to hike in. The 27 miles of trails in the Haleakala wilderness cover a land of great contrasts, not only of terrain, but also of topography.
Weather changes rapidly.
You may be exposed to intense sunlight, and then engulfed in thick clouds and heavy rain. Haleakala rises to 10,023 feet, with a decent to the valley floor of 1,400 feet to 3,000 feet. Trails are strenuous at this elevation due to the lack of oxygen and altitude sickness is a concern. Pregnant women and people with heart or respiratory conditions should consult with their doctor before visiting the Park. Temperatures commonly range between 40 to 65 F, but can be below freezing at any time with the windchill factor.