At 12,183 feet, this Colorado highway makes every other scenic drive feel flat

It’s an ancient crossing turned scenic highway

Trail Ridge Road climbs to 12,183 feet above sea level, and 11 of its 48 miles stay above 11,000 feet. That makes it the highest continuous paved road in the country.

You drive from Estes Park on one side of the Continental Divide to Grand Lake on the other, crossing through Rocky Mountain National Park the whole way.

Forest gives way to treeless tundra, and the air gets thin enough to notice.

Most people plan two to three hours for the drive alone, but a full day disappears fast once you start pulling over.

Ute and Arapaho trails came first

Long before anyone poured asphalt, Ute and Arapaho peoples crossed this ridge on foot. The Arapaho called their route the Dog Trail because dogs hauled their loads up the steep terrain.

Ute travelers marked their way through Forest Canyon Pass with stone cairns, and the modern Ute Trail still follows part of that path. Construction on the road started in 1929 and reached Grand Lake by 1938.

It replaced the old Fall River Road, an unpaved, one-way route with grades as steep as 16 percent. Trail Ridge Road maxes out at 7 percent and sits on the National Register of Historic Places.

Many Parks Curve spreads the valley below you

Many Parks Curve hits you at the road’s first real hairpin turn heading west from Estes Park. You look back and see Horseshoe Park, Moraine Park and the town of Estes Park fanned out below.

The Mummy Range fills the view to the northeast, and Longs Peak stands to the southeast. Down in the valley, the Alluvial Fan shows where major floods in 1982 and 2013 reshaped the land.

Even when the upper road closes for winter, this section usually stays open, so you can reach it most of the year.

Rainbow Curve is where the trees give up

At 10,875 feet, Rainbow Curve earns its name from the rainbows that follow afternoon storms. The overlook drops your gaze into Hidden Valley, across Horseshoe Park and along the path of Fall River far below.

This is roughly where the forest ends and open tundra begins. You start to notice the trees changing.

They grow shorter, twisted, with branches on only one side from years of wind.

Some of those stunted trees near the tree line look like saplings but have been growing for hundreds of years.

Forest Canyon drops 2,000 feet beneath you

A short trail at 11,716 feet leads to the Forest Canyon Overlook, and then the ground falls away.

Nearly 2,000 feet below, Forest Canyon stretches out where glaciers and the Big Thompson River carved a deep valley over thousands of years. On clear days, you can spot alpine lakes dotting the canyon floor.

Marmots run across the rocks here, and you might catch babies in early summer.

Look southeast and Longs Peak rises to 14,259 feet, with Stones Peak and Terra Tomah Mountain flanking the view.

Walk through tundra at Rock Cut

Road builders blasted through solid rock at this section to clear the way for the highway. The Tundra Communities Trail starts here, a 1.2-mile round-trip paved path through the alpine tundra.

Interpretive signs along the way explain how anything survives up here at all. A side path takes you to the Mushroom Rocks, strange formations of ancient gneiss and granite.

The trail ends at the Toll Memorial, a rock formation at 12,319 feet.

Tundra plants get about 40 frost-free days a year, and one footstep off the path can crush growth that took centuries.

Lava Cliffs hold 28-million-year-old volcanic rock

Near the road’s highest point at 12,135 feet, the Lava Cliffs rise from the tundra.

These volcanic rock formations started in the Never Summer Mountains about 28 million years ago, and glaciers eventually exposed them. Birdwatchers gather here because nesting birds favor the rocky faces.

Snow lingers on the surrounding slopes well into summer, and the views stretch across open tundra in every direction.

The thin air at this altitude carries less oxygen than what you breathe at lower elevations, so take your time getting out of the car.

The country’s highest visitor center sits at 11,796 feet

The Alpine Visitor Center holds the record for the highest visitor center in the entire National Park System. Inside, exhibits cover alpine ecology, and a cafe with big windows looks out over the tundra.

The short Alpine Ridge Trail starts nearby and climbs to panoramic views above 12,000 feet, but the steepness at this altitude earns every step.

Old Fall River Road, the park’s original high-country route, ends in the same parking area. During summer months, elk herds graze in the meadows below, and you can watch them from the windows.

Elk, bighorn sheep and pikas roam the ridgeline

Rocky Mountain National Park supports 67 mammal species, and Trail Ridge Road puts you right in their territory. Elk graze on the tundra in summer and gather in meadows during fall mating season.

Bighorn sheep, the park’s symbol, stick to the rocky slopes near the Alpine Visitor Center and Rock Cut. Yellow-bellied marmots stretch out on warm rocks and whistle when something gets too close.

Pikas live in the talus above the tree line, and you hear their squeaks before you spot them. On the west side, moose wade through willow thickets in the Kawuneeche Valley.

Water splits two ways at Milner Pass

The Continental Divide crosses the road at Milner Pass, 10,759 feet up. Rain falling on the east side of this line flows toward the Atlantic Ocean.

Rain on the west side heads for the Pacific. Poudre Lake sits just east of the pass and feeds the Cache la Poudre River, while streams on the west side drain toward the headwaters of the Colorado River.

Short trails lead through the surrounding forest and down to the lakeshore. Bull elk hang around the north end of Poudre Lake, especially in the early morning.

The west side drops into a valley scarred by fire

Past Milner Pass, the road winds down through the Kawuneeche Valley along the North Fork of the Colorado River. Farview Curve gives you a long look at the valley floor and the Never Summer Mountains beyond it.

The Holzwarth Historic Site preserves a 1920s homestead that became a guest ranch, with original cabins still standing. Burn scars from the 2020 East Troublesome Fire mark large sections of this stretch.

That fire raced 25 miles in a matter of hours.

Several trailheads and picnic areas line the road before you reach the west entrance near Grand Lake.

Tiny wildflowers up here are older than they look

From late June through July, wildflowers spread across the alpine tundra along Trail Ridge Road.

Alpine forget-me-nots, phlox and various grasses push through rocky soil despite a growing season that barely lasts six weeks. Most tundra plants grow flat against the ground to survive winds that tear across the ridge.

Some of these plants stand only inches tall but have been alive for hundreds of years. Fall shifts the color down to the lower elevations, where changing foliage lines the road on both sides.

Drive Trail Ridge Road in Rocky Mountain National Park, Colorado

You can reach Trail Ridge Road from either side of the park.

The east entrance sits near Estes Park, about 70 miles northwest of Denver, and the west entrance opens near Grand Lake.

The road typically opens around Memorial Day weekend and closes by mid-October, depending on weather. You need a timed entry reservation during peak season, and the park entrance fee runs $35 per vehicle for seven days.

Bring warm layers no matter when you go, because temperatures above tree line can drop 20 degrees below what you left in town. The Alpine Visitor Center has restrooms, a gift shop and a cafe.

Plan a full day.

This article was created with AI assistance and human editing.

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