Hiking in the Rockies in the summer can be as hot as 90 degrees Fahrenheit, or it can be snowing up in the high country. Dressing in layers is essential. There is also a good chance for rain most late afternoons, so waterproof and breathable rain gear is essential. A hat to keep the sun off, and a sturdy pair of hiking boots will give you a great trip. Click here for more details about recommended hiking clothing.