Rising from 7,800 feet to 12,000 – even 14,000 feet in some places – RMNP is a high-elevation park and if you don't give yourself time to adjust to the thinner atmosphere and lower oxygen levels, you could run the risk of getting the headaches, nausea and disorientation characteristic of altitude sickness. Along with taking a day or so to acclimate to the high altitude, you should make sure to consume plenty of water and food to ward off symptoms.
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]
The first week of the park shutdown brought little financial impact, said town manager Frank Lancaster, probably because most tourists had already booked their Christmas stays and couldn't cancel. Along the town's main street Wednesday, tourists peered in candy store windows, shopped for T-shirts and rented snowshoes, and there was  little sign the nearby park is largely inaccessible.
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.

Located at the foot of Pikes Peak, Colorado Springs draws visitors who come to see the view from the mountain that inspired the writing of the song “America, the Beautiful.” Some hike to the mountain’s 14,115-foot (4,302 meter) summit while others drive or enjoy a ride on the Pikes Peak Cog Railway. With its sculptural sandstone formations and balancing rocks, the Garden of the Gods is another popular natural attraction. This culturally rich city has many museums worth exploring too, including the Fine Arts Center, Pioneer Museum and the Rock Ledge Historic Site, an open-air museum where costumed docents depict life in Colorado Springs throughout its long history.
Become immersed in Rocky’s pristine landscape on some of the park’s 355 miles of hiking trails. Choose from flat lakeside walks to steeper, more challenging mountain climbs. The easy .6-mile Bear Lake trail is a popular hike featuring an interpretive nature trail hugging a subalpine lake at the end of Bear Lake Road. For a stunning waterfall hike, make your way to Alberta Falls or Ouzel Falls.
Owners Wendye Sykes and Shelley Powers came to Estes Park from San Francisco looking for an escape from the grind of everyday city life — and that’s exactly what they’ve created at River Spruce. Offering nine different cabins, you’ll find lodgings suitable for couples and families all nestled amidst the scenic Rocky Mountain wilderness and along the Big Thompson River.
Sonnenalp Hotel is often named as Vail’s top hotel, in a place that’s already home to countless exceptional properties. A Bavarian-style lodge, it offers Old World Alpine traditions merged with the spirit of the west. All rooms offer views of either Gore Creek or Vail Village and boast impressive amenities like goose down comforters and handmade furniture, a fireplace, marble bathrooms with heated floors and an oversize tub. The impressive breakfast buffet is a great way to fuel up for activities, which includes spa services, a private 18-hole golf course, hotel ski guides, and more.
A comfortable reading and DVD library serves as the perfect place to relax with a book and a glass of wine, and there is free high-speed Internet throughout the property. The Wild Horse Inn is surrounded by incredible natural landscapes that offer an array of activities to partake in, from hiking, mountain biking, and climbing to boating, rafting and fishing, and various snow sports in the winter. The inn is located 1 hour and 30 minutes from Denver.
Snow-fed rivers tumble over granite boulders in the Rocky Mountains, creating an ideal environment for fly-fishing and whitewater rafting. The state's most famous river -- the Colorado -- flows from headwaters in Rocky Mountain National Park, with alternating stretches of heart-pounding hydraulics and quiet areas where you can wade out and cast your fly. Stay at a Bureau of Land Management campground along the shore, or at private riverside cabins such as those found at Colorado Cabin Adventures 3 miles from Grand Lake. For a more remote experience, stay at Cottonwood Cove, tucked along the banks of the Rio Grande just downstream from the picturesque mining town of Creede.
Above tree line, at approximately 11,000 ft (3,400 m), trees disappear and the vast alpine tundra takes over.[69] Over one third of the park resides above the tree line, an area which limits plant growth due to the cold climate and strong winds. The few plants that can survive under such extreme conditions are mostly perennials. Many alpine plants are dwarfed at high elevations, though their occasional blossoms may be full-sized.[73] 
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