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]
A small mining camp not so long ago, Boulder is a modern, sophisticated town at the base of the Flatirons, popular among extreme sports folks and lovers of magnificent nature of all ages. Stroll through the charming downtown with the popular Pearl Street Mall. Discover Boulder’s past at the Boulder History Museum located in the beautiful historic Harbeck-Bergheim House. Boulder Museum of Contemporary Art not only has a range of permanent and temporary exhibits, but also popular educational programs.
An alluring destination to explore throughout the year, Durango offers a wealth of activities for every season. From white water rafting to horseback riding, fishing and snowboarding, outdoor enthusiasts will be in heaven at Durango. Popular for its Durango train ride day trip, the famous line runs from the old mining areas in Durango and Silverton, where visitors can soak in breathtaking views of the mountain vistas against its black steam-powered engines. Explore the archaeological sites in Mesa Verde National Park, visit Henry Strater Theatre, the oldest running theatre in Colorado, and explore the downtown area to discover an array of lovely shops, galleries and eateries.
Colorado has one of the most diverse plant and animal environments of the United States, partially due to the dramatic temperature differences arising from varying elevation levels and topography. In dry climates, the average temperature drops 5.4 degrees Fahrenheit with every 1,000 foot increase in elevation (9.8 degrees Celsius per 1,000 meters). Most of Colorado is semi-arid with the mountains receiving the greatest amount of precipitation in the state.[64]
There are four ecosystems, or zones, in Rocky Mountain National Park: montane, subalpine, alpine tundra, and riparian. The riparian zone occurs throughout all of the three other zones. Each individual ecosystem is composed of organisms interacting with one other and with their surrounding environment. Living organisms (biotic), along with the dead organic matter they produce, and the abiotic (non-living) environment that impacts those living organisms (water, weather, rocks, and landscape) are all members of an ecosystem.[66]
At 265,000 acres, Rocky Mountain National Park isn't the country's largest national park, nor is it the most-frequented with about 4 million annual visitors (compared to Great Smoky Mountains National Park's more than 11 million visitors). But there is something definitively magical about RMNP, which rises 12,183 feet into the Colorado sky. The main attraction is hiking its 350-some miles of trails that wind through pine and spruce forests, glittering alpine lakes, swaths of wildflowers and if you're lucky, some elk or bighorn sheep. And maybe it's the thinner atmosphere that goes to visitors' heads, but even the most jaded report feelings of awe and wonder after a day or two of breathing in that refreshing mountain air.
The Golden Triangle Museum District boasts eight of the city’s museums and the Denver Performing Arts Complex can provide ample entertainment. Outdoor activities include biking along the historic Greenway Trail, having fun at one of the several extreme sports parks, playing a round of golf, strolling through lovely parks and gardens, or visiting the Denver Zoo. Things to Do in Denver
Alta Lakes is a pristine and secluded wilderness setting situated 30 minutes outside the charming mountain town of Telluride, Colorado. The Observatory is nestled underneath the 13,000-foot peaks of the San Juan Mountains – it is one of only a few homes in the United States at 11,000+ feet! The backcountry cabin with charming rugged details serves as the perfect romantic mountain getaway for couples. 
When it’s your turn for some pampering, escape to Smith Fork Ranch in Crawford within the secluded Gunnison National Forest, where romance and relaxation are as big of a priority as adventure. Indulge in sumptuous open-air massages, luxe cabins and candlelight dinners featuring farm-to-table cuisine from the ranch’s organic homestead. During adult weeks in September and October, activities range from archery to fly-fishing, if you’re not too busy taking it easy.
Popular during both the winter and the summer, Crested Butte offers year-round activities that appeal to outdoor enthusiasts. Soak in the crisp mountain air after taking the Silver Queen lift up to 11,875 feet up to see Crested Butte from above, visit the pedestrian-friendly city center with its myriad of locally owned shops, or choose your pick between summer and fall mountain biking and the area’s numerous trails. Those with little ones can head to the Trailhead Children’s Museum, Crested Butte Mountain Heritage Museum or find swimming and hiking at Meridian Lake in the summer. 
It’s always “do not disturb” mode at this quaint adults-only hideaway in Crested Butte that’s strictly 16-plus. Just a few blocks from historic Elk Avenue, Purple Mountain Bed & Breakfast has six plush rooms, an onsite day spa and an outdoor hot tub. In the winter, a free shuttle whisks you to Mt. Crested Butte for some of Colorado’s best skiing; when you’re ready for après, retire back to the house for complimentary craft beer on tap and a Ghirardelli hot chocolate bar you won’t have to share with the kids. Happy hour, indeed. Find more B&Bs in Colorado >>
Fort Collins is the perfect base camp for your trip, located just 35 miles from the peaks of Rocky Mountain National Park that soar to more than 13,000 feet and form the Continental Divide. The town of Estes Park sits at the eastern edge of the park. Rocky Mountain National Park covers 410 square miles and includes Longs Peak (14,255 feet high), 18 named peaks above 13,000 feet, 150 named lakes, and the highest continuously paved highway in the U.S. — Trail Ridge Road. The road is usually open from Memorial Day until early October. However, the park is open year-round and lower elevation roads are open during the winter.
Enjoy LUXURY mountain cabins at our resort with outstanding VALUE. "A Home Away from Home Getaway." 1, 2, and 3-bdrm condos available with fully applianced kitchens, living room fireplaces & private decks overlooking Fall River. Private hot tubs & spa suites are also available. Located only 1 mi. to RMNP, 3 mi. to Downtown. FREE: Stocked river fishing, Wi-Fi, local calls, movies, games, indoor & outdoor activities. Estes Park Condos Details
Apart from elk, many other ungulates reside in the park, including bighorn sheep, moose, and mule deer. Bison were eliminated from the park in the 1800s, as were pronghorn and moose, the latter of which was restored to the area in 1978. Moose are now frequently seen in the park, especially on the park's west side.[77] The park's bighorn sheep population has recovered and is estimated at 350 animals.[78]
Below 9,400 feet (2,865 m), temperatures are often moderate, although nighttime temperatures are cool, as is typical of mountain weather.[49] Spring comes to the montane area by early May, when wildflowers begin to bloom. Spring weather is subject to unpredictable changes in temperature and precipitation, with potential for snow along trails through May.[49] In July and August, temperatures are generally in the 70s or 80s °F during the day, and as low as the 40s °F at night.[49] Lower elevations receive rain as most of their summer precipitation.[48]
Leave the fast lane, cross our covered bridge to simple serenity in a cozy cottage, suite or vacation home in towering pines along Fall River. Bask in hot tub bubbles. Warm to the scent and sizzle of a wood-burning fireplace. Fall asleep to the river's lullaby. Roam 30 acres adjoining RMNP. Enjoy the serendipity of wandering wildlife and friendly gatherings in our library. Castle Mountain Lodge on Fall River Details
Romantic getaways in Colorado combine sequestered mountain retreats with the cowboy spirit of culture-packed cities like Denver. Set beneath the Rocky Mountains, romantic weekend getaways in Colorado offer the opportunity to see one of America's oldest resort towns, Colorado Springs. Whether you're partying at a festival in idyllic Telluride or hiking through the rock formations of the Garden of the Gods, you'll find it hard not to believe you're in paradise when you're on vacation in Colorado.
The perfect blend of a picturesque main street with 2,358 acres of incredible skiing opportunities, Breckenridge is the oldest and largest town in Colorado’s famous Summit County. Take a tour of the 12-block downtown area and window shop through its quaint Main Street shops before strapping up your boots and heading to the famous Breckenridge Ski Resort. In the summer, take the ski ride lift up to find an array of hiking trails, while biking and golf are also popular activities. Host to numerous arts events throughout the year, this Certified Colorado Creative District has exciting public art spaces throughout the area in addition to a National Repertory Orchestra and Backstage Theatre.
Hot Tubs, Woodstoves, Secluded, Outdoor Fireplace for campfire, WiFi. Charming, pet friendly, private vacation cabins off Hwy 7 in Allenspark and Raymond, conveniently located between Lyons and Estes Park. Choose directly on the Middle St Vrain River OR on spacious, wooded acreage bordered by the famous crystal clear Willow Creek. Year round-Great Value! Hideout Cabins Details
The complex interactions of elevation, slope, exposure and regional-scale air masses determine the climate within the park,[48][49] which is noted for its extreme weather patterns.[49] A "collision of air masses" from several directions produces some of the key weather events in the region. When cold arctic air from the north meets warm moist air from the Gulf of Mexico at the Front Range, "intense, very wet snowfalls with total snow depth measured in the feet" accumulate in the park.[48]
Explore the nearby great outdoors at the Horsetooth Mountain Open Space or get your adrenaline pumping by rafting on Cache La Poudre River with the Mountain Whitewater Descents Company. Visit Global Village Museum of Arts and Cultures to learn about folk art from all over the world. Take the kids to the Farm at Lee Martinez Park to learn about the farm life and play with baby farm animals.
