Rocky Mountain National Park - Plan Your Visit (U.S. National Park Service)

No matter what the season, a visit to Rocky Mountain National Park will be enhanced by planning. Here are a few tips:

Most of Rocky Mountain National Park's visitors arrive during the summer months. Camping reservations inside the park and lodging reservations in resort communities.
Elevation is an integral part of the park experience. As the park is all above 7,500 feet, take time to acclimate before undertaking strenuous activities. Even driving at high elevation can affect sensitive individuals. Altitude sickness symptoms include shortness of breath, fatigue, dizziness, nausea, rapid heartbeat and insomnia. If symptoms persist, depart for lower elevation.
A variety of books, maps, and other materials are available for sale through the Rocky Mountain Nature Association bookstore. The store offers something for everyone, from the youngest to the most experienced visitor.
Upon arrival, stop by one of the park visitor centers for up-to-the-minute information on everything from road conditions to hiking trails, camping, and ranger-led programs.