The Rocky Mountain National Park Stamp

Where Rocky Mountain is

Rocky Mountain, for people who count parks

Signed January 26, 1915, by Woodrow Wilson. Depending on how you count General Grant National Park, which was absorbed into Kings Canyon in 1940, this was either the ninth or the tenth national park. Collectors argue about it. Both answers are defensible.

Enos Mills got it done and did not get what he wanted. He moved to Colorado at 14 for his health, homesteaded below Longs Peak, and ran an inn. A chance meeting with John Muir on a San Francisco beach in 1889 turned him into an activist. He was a publicist, not a legislator: lecture tours, fifteen books, photographs, and a coalition that reached from the Sierra Club to the Daughters of the American Revolution. He campaigned for a park of about 1,000 square miles. Mining, grazing and timber interests cut it down again and again, and the park that passed was about 358 square miles, roughly a third of what he asked for. He was called the father of the park afterward, though Mary Belle King Sherman and others were just as central. He then fell out bitterly with the new Park Service over transportation concessions and died at 52.

Trail Ridge Road is the highest continuous paved road in the country, topping out at 12,183 feet. Keep the word continuous: two Colorado roads go higher, but both are dead-end spurs to a summit. Eleven miles of Trail Ridge sit above the treeline, and it runs 20 to 30 degrees colder up there than in Estes Park.

Opening it every spring is the real story. Plowing starts in mid-April with crews working toward each other from both sides until they meet at the Alpine Visitor Center, which at 11,796 feet is the highest visitor center in the entire park system. In 2013 they were cutting through drifts averaging 18 to 22 feet. The road usually opens the last week of May and closes in mid-October. Earliest opening on record was May 7. Latest was June 26.

The Colorado River starts here, at La Poudre Pass in the northwest corner, as something you can step across. Downstream it supplies water to roughly 40 million people.

Official Rocky Mountain park site (nps.gov)

What lives in Rocky Mountain

Pikas, and why they are the ones to watch. Six inches long, related to rabbits rather than rodents, and they do not hibernate. They spend all summer cutting and curing vegetation into haypiles that have to feed them through nine months of alpine winter. Their normal body temperature is 104 degrees and fatal heat stress starts around 109. That is the entire margin. The same dense fur that makes them cold-hardy makes them heat-intolerant, and they also need deep snowpack as insulation to survive the winter under the talus. Warming threatens them from both ends. They have vanished from 44% of Great Basin sites they held 110 years ago. Rocky Mountain's are still doing comparatively well.

Elk, and a problem the park created itself. Elk were hunted out of the Estes Valley by the 1880s. The park's founders brought them back from Yellowstone in 1913, before the park legally existed. Wolves and grizzlies were already gone, so nothing checked them. The herd exploded and stripped the willow and aspen. The Park Service culled directly from 1944 to 1968, then stopped as public attitudes turned, and by the 1990s had an overabundant, concentrated, barely migratory herd doing documented damage. A management plan started in 2008 using fencing, culling and restoration. It worked: willow height up 29%, aspen sapling recruitment doubled.

Bighorn sheep, the park symbol, and the Sheep Lakes crossing. Scabies and pneumonia caught from domestic sheep collapsed the herds by the early 1900s, down to about 150 animals by the 1950s. There are now 300 to 400. In late spring they come down from the Mummy Range to eat mineral-rich soil at Sheep Lakes, which means crossing a road to get there, which is why the park runs a volunteer brigade to stop traffic for them. Ram horns can weigh 30 pounds, about as much as the rest of the animal's skeleton.

Moose, and an argument about whether they belong. The official account is that Colorado released 24 moose in 1978 and 1979 and the first was documented in the park in 1980, making them introduced rather than reintroduced. Researchers publishing in 2025 dispute that, pointing to sightings from the 1860s, an 1863 diary describing cows and calves, the place name Moose Park, Indigenous oral traditions, and archaeological remains. Not settled. What is not disputed: willow is 91% of a moose's summer diet, versus about 15% for elk.

The Rocky Mountain designs

Bear Lake and Hallett Peak

A subalpine lake at 9,475 feet in a glacier-carved basin, and the most visited spot in the park for a simple reason: it is a 0.7-mile loop with 20 feet of elevation gain and it hands you a postcard for almost no effort. Hallett Peak rises straight behind it at about 12,720 feet, its blunt north face one of the most recognizable profiles in Colorado. The classic shot is the reflection in still morning water, which the wind usually destroys by mid-morning.

Trail Ridge Road Alpine Tundra

Eleven miles above the treeline, where there are no trees at all, just ground-hugging cushion plants on wind-scoured rock. The growing season is about six weeks. Winter gusts of 98 to 122 miles per hour have been recorded. The road is as much the subject as the tundra: a thin ribbon of asphalt with no shoulders and almost no guardrails, running across the top of a mountain range with nothing above it.

Longs Peak Diamond Face

The Diamond is a sheer 900-foot wall on the upper east face of the park's only fourteener, and the entire thing sits above 13,000 feet. The Park Service refused permission to climb it until 1960. Dave Rearick and Bob Kamps made the first ascent that August. The non-technical Keyhole Route up the mountain is 14.5 miles round trip with nearly 5,000 feet of gain, and it has killed around 60 people. The standard start time is 2 a.m., to be off the summit before the afternoon lightning.

How to record your Rocky Mountain visit

Rocky Mountain, asked and answered