The Pierre Shale formation was deposited during the Paleogene and Cretaceous periods about 70 million years ago. The region was covered by a deep sea—the Cretaceous Western Interior Seaway—which deposited massive amounts of shale on the seabed. Both the thick stratum of shale and embedded marine life fossils—including ammonites and skeletons of fish and such marine reptiles as mosasaurs, plesiosaurs, and extinct species of sea turtles, along with rare dinosaur and bird remains—were created during this time period. The area now known as Colorado was eventually transformed from being at the bottom of an ocean to dry land again, giving yield to another fossiliferous rock layer known as the Denver Formation.[58]

Visitors come from far reaches to travel America’s highest continuous paved highway. Not for the queasy and open only between Memorial Day — pending the towering walls of winter snow have melted — and Labor Day, two-lane Trail Ridge Road takes explorers across the Continental Divide, past weathered tundra overlooking sweeping valleys and into the clouds at 12,183 feet. The ribbon of a road covers the 46-mile stretch between Estes Park on the park’s east side and the marine town of Grand Lake at the park’s western entrance. There Peak to Peak Highway is another byway near the park, starting in Estes and going through Nederland, Black Hawk and Central City.
After facing near extinction last century, the bighorn sheep population is currently thriving: there are roughly 300–400 of these striking animals in the park. Look for them at the aptly named Sheep Lakes from May through mid-August, when the bighorns descend to eat soil and obtain minerals not found in their high mountain habitat. Their visits generally occur between 9 a.m. and 3 p.m.
Located 17 miles from the Winter Park ski resort and 16 miles from Vail, Frisco is the perfect small-town getaway. You can relive life as a miner in the Old West at Frisco’s historic park and museum or take a mountain bike ride that takes you over 55 miles of paved pathways. Strap on snowshoes or cross-country skis for a turn around the Frisco Nordic Center. During the summer, paddle or motor out to the Sentinel Island from the Frisco Bay Marina. Rent a cozy condo at Mountainside, or consider renting a lovely house on the Blue River. Warm up the evening with delicious farm-to-table fusion fare Italian-style at Bagalis Frisco.
Experience the high country the old fashioned way — atop a horse. This is a wonderful way for older children to see more alpine country than possible on foot. There are two stables located within the park: Glacier Creek Stables and Moraine Park Stables. Approximately 260 miles of trails are open to horse use, which makes up more than 70 percent of the total trail network in the park.
Rocky Mountain National Park is home to many species of animals, including nearly 70 mammals and almost 300 species of birds. This diversity is due to the park's varying topography, which creates a variety of habitats. However, some species have been extirpated from the park, including the gray wolf, the wolverine, the grizzly bear, and the American bison.
The A.R. Mitchell Museum of Western Art and the many galleries in the creative district are bound to thrill art lovers, while the Southern Colorado Repertory Theater provides live entertainment. Outdoor enthusiasts can go camping, fishing, hiking and boating in the Trinidad Lake State Park, seek dinosaur tracks in the Comanche National Grassland, or go trout fishing on the Purgatoire River.
Only a short drive from lively Steamboat Springs, the Aspen View Lodge is tucked away on the edge of the Rabbit Ears Pass recreational area and Routt National Forest. Surrounded by mature aspens, the lodge fits in perfectly with its huge rough-hewn timbers and a wall of glass. The lodge can accommodate 35 guests in 12 contemporary, comfortable bedrooms with all the necessary amenities.
Nestled below Colorado's radiant mountaintops is beautiful Lazy R Cottages in Estes Park. Just one mile from Rocky Mountain National Park, we offer one-, two- and three-bedroom cabins perfect for romantic escapes and family vacations. Our cabins have kitchens or kitchenettes, fireplaces, decks with mountain views, and some with personal hot tubs … perfect for relaxing after a day enjoying Estes Park and the National Park. Dog-friendly units available ($15 per dog/per night). Free Wi-Fi. View more about our Estes Park cabins.
When it comes to the best weekend getaways in Colorado, Colorado Springs is a top choice with a little bit of everything—numerous hiking trails, interesting museums, an artsy historic district, and plenty of restaurants and breweries. It’s also home to Garden of the Gods, a National Natural Landmark featuring hiking, climbing, and stunning views at the foot of Pikes Peak.
×