Medical assistance may be necessary. Lightning poses a tremendous hazard at high altitudes. If you are hiking and see a storm coming in, retreat to a lower location. To prevent blisters , the most common ailment on the trail, wear comfortable shoes or boots that suit your needs and the terrain. Likwise, choose quality outdoors socks to wear for cushioning and protection.
Snow often lingers well into the summer on steep mountain slopes.
It's easy to lose your footing on these slippery snowfileds and slide into boulders at their bases. Ticks are found in much of the park, particularly in the meadows. Use a repellent and check for them regularly. A brochure about ticks is available at visitor centers. Be prepared for rapid changes in weather year-round.