From 9,000 ft (2,700 m) to 11,000 ft (3,400 m),[72] the montane forests give way to subalpine forests.[69] Forests of fir and Engelmann spruce cover the mountainsides in subalpine areas. Trees grow straight and tall in the lower subalpine forests, but become shorter and more deformed the nearer they are to the tree line.[72] At the tree line, seedlings may germinate on the lee side of rocks and grow only as high as the rock provides wind protection, with any further growth being more horizontal than vertical. The low growth of dense trees is called krummholz, which may become well-established and live for several hundred to a thousand years old.[72]
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.
Overlooking the scenic Beaver Creek Mountain, Park Hyatt Beaver Creek is a luxury Colorado resort and spa where guests can experience the vacation of their dreams. From breathtaking mountain views to championship golf courses to exquisite cuisine, Hyatt’s Beaver Creek ski resort offers the perfect year-round Vail Valley mountain escape with premium amenities, such as ski in and ski out access, a year-round heated outdoor pool, and an outdoor fire pit for roasting s’mores.
Rock climbing and mountaineering opportunities include Lumpy Ridge,[85] Hallett Peak, and Longs Peak, the highest peak in the park, with the easiest route being the Keyhole Route. This 8 mi (13 km) one-way climb has an elevation gain of 4,850 ft (1,480 m). The vast east face, including the area known as The Diamond, is home to many classic big wall rock climbing routes. Many of the highest peaks have technical ice and rock routes on them, ranging from short scrambles to long multi-pitch climbs.[86]

Adventure Ridge is the big news at Vail and mid-summer, the resort will implement several new activities, including a four-line 1,200-foot long zip line, two aerial ropes courses, and a kids zip line as well as a kids ropes course, climbing wall, rebound trampoline. Gore Creek Mini Golf offers family-friendly putting atop the Lionshead base area for the second summer season. Grab your family and try the  FREE bean bag toss, horseshoes or the new slackline park where kids of all ages can test their balance at a variety of levels. If your kids are age four and older, they can use digging tools and a map to uncover dinosaur bones and learn about prehistoric creatures. The FREE Bud Light Hot Summer Nights Concert Series on Tuesdays June 12-August 21 has become the social event of the season. If you have aspiring adventurers, the 4th annual KEEN Vail Kids Adventure Race on August 10 and 11 lets kids ages 6 through 14 experience the thrill of adventure racing with mountain biking, hiking, tubing, archery, a low ropes course, a zip line, a climbing wall, a Tarzan swing, a giant slip-n-slide and more.
While it is possible to travel through Rocky Mountain National Park and not catch sight of any wildlife, we venture to say that is an unlikely experience. From everyday sightings of chipmunks and mule deer to the moving experience of viewing elk in rut (the mating season), the animals in the park let you know that you are part of something truly wild. Some of these critters are harder to spot than others - they might camouflage themselves in the trees or hide in the underbrush - but look closely and you may have an encounter unlike any other. 
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