RMNP's only 14er: 14.5 mi RT via the Keyhole Route

14,259ft summit, the highest peak in Rocky Mountain National Park

14.5 mi round trip, 5,100 ft of gain · Rated expert

Class 3 to 4 exposed scramble past the Keyhole with a fatal-fall history

Summit panorama · Fourteener country

• In its best months now (Jul to Sep)

7-mi 14er from Guanella Pass: 11,669 ft trailhead, willow bog at the base

14,060ft summit, the most climbed 14er in Colorado

7 mi round trip, 2,850 ft of gain · Rated hard

Summit panorama · Fourteener country

• In its best months now (Jun to Sep)

Tenmile Range 14er via the East Ridge, parking reservation required at hikequandary.com

14,265ft summit, the tallest of the Tenmile Range peaks

6.75 mi round trip, 3,300 ft of gain · Rated hard

Summit panorama · Fourteener country

• In its best months now (Jun to Sep)

1.8-mi lake loop framing the Maroon Bells at 9,580 ft, timed-entry shuttle required

View Maroon Peak (14,156 ft) and North Maroon Peak (14,019 ft), Colorado's most-photographed Fourteeners, from a 1.8-mile lake loop at 9,580 ft

1.8 mi round trip, 500 ft of gain · Rated moderate

Alpine lakes · Fourteener country

• In its best months now (Jun to Oct)

0.8-mi RMNP loop on Bear Lake Road, the gateway to Nymph, Dream, and Emerald Lake

Paved, accessible 0.8-mile loop around alpine lake

0.8 mi round trip, 20 ft of gain · Rated easy

Alpine lakes · The Flatirons

• In its best months now (May to Oct)

Three alpine lakes in one RMNP day hike

Passes three stunning alpine lakes: Nymph, Dream, and Emerald

3.6 mi round trip, 605 ft of gain · Rated easy

Alpine lakes

• In its best months now (Jun to Sep)

Wheelchair-accessible mountain lake in Rocky Mountain National Park

Wheelchair and stroller accessible, with a flat compacted-gravel loop

0.7 mi round trip, 36 ft of gain · Rated easy

Alpine lakes · Wildlife watching

• In its best months now (May to Oct)

Lily-pad alpine lake, the first stop on the Bear Lake corridor

First stop on the Nymph → Dream → Emerald progression from Bear Lake

1.1 mi round trip, 245 ft of gain · Rated easy

Alpine lakes · Wildflowers · Wildlife watching

• In its best months now (Jun to Oct)

Boulder's gateway to the Flatirons, a 3.2-mi loop from downtown OSMP

Direct access to the Flatirons, Boulder's most recognizable landmark

3.2 mi round trip, 780 ft of gain · Rated easy

The Flatirons

• In its best months now (Mar to Nov)

1,400 ft climb to a 7,040 ft sandstone arch, 3.4 mi RT from Chautauqua

Natural sandstone arch at 7,040ft with panoramic Boulder views

3.4 mi round trip, 1,400 ft of gain · Rated hard

Hand-use sections on steep loose rock at the final approach to the arch

Summit panorama · The Flatirons · Wildflowers

• In its best months now (Apr to Oct)

Boulder OSMP's second-highest summit: 8,461 ft via West Ridge or Fern Canyon

8,461ft summit with 360-degree views from Longs Peak to Pikes Peak

5.5 mi round trip, 2,850 ft of gain · Rated hard

Short Class 2 to 3 scramble at the summit block

Summit panorama

• In its best months now (Apr to Oct)

Boulder OSMP's highest summit at 8,549 ft, 6.8 mi RT via Shadow Canyon

8,549ft, the highest summit in Boulder Open Space

6.8 mi round trip, 2,950 ft of gain · Rated hard

Rocky scramble for the final 200 ft to the summit

Summit panorama

• In its best months now (Apr to Oct)

The Skyline Traverse's central summit: 8,144 ft via Gregory Canyon

8,144ft summit, the third-tallest peak in Boulder's mountain backdrop

5.6 mi round trip, 2,378 ft of gain · Rated hard

Summit panorama

• In its best months now (Apr to Oct)

The gentlest Skyline Traverse summit, drivable or hiked

6,950ft summit reachable by foot or paved road, the only Skyline peak with vehicle access

4.2 mi round trip, 1,494 ft of gain · Rated moderate

Summit panorama

• In its best months now (Mar to Nov)

Boulder's steepest popular summit: 1,300ft in a mile and a half

6,863ft summit, the northernmost Skyline Traverse peak

3.1 mi round trip, 1,323 ft of gain · Rated moderate

Summit panorama

• In its best months now (Jan to Dec)

Boulder's easiest lake loop: wetlands, prairie, and Foothills views

1.8-mile family-friendly lake loop on paved and soft-surface trail

1.8 mi round trip, 88 ft of gain · Rated easy

Wildlife watching · Creekside

• In its best months now (Mar to Dec)

Flat creek-side prairie walk, Boulder's easiest accessible trail

Flat 2.5-mile prairie walk, among Boulder's most accessible trails

2.5 mi round trip, 49 ft of gain · Rated easy

Wildlife watching · Creekside · The Flatirons

• In its best months now (Mar to Dec)

Chautauqua's gradual beginner climb toward the Flatirons

2-mile gradual climb on a broad well-graded gravel surface

2 mi round trip, 416 ft of gain · Rated easy

The Flatirons

• In its best months now (Mar to Nov)

Mount Sanitas's gentle valley alternative, a broad gravel uphill

Broad gravel valley walk: no scrambling, no rocky upper-third

2.4 mi round trip, 465 ft of gain · Rated easy

Summit panorama · The Flatirons

• In its best months now (Jan to Dec)

Half-mile interpretive loop at NCAR's Mesa Laboratory

0.4-mile interpretive loop at I.M. Pei's iconic NCAR Mesa Laboratory

0.4 mi round trip, 75 ft of gain · Rated easy

The Flatirons

• In its best months now (Jan to Dec)

Short summit loop with 360° Continental Divide views

1.1-mile loop to a 7,160ft grassy summit dome

1.1 mi round trip, 196 ft of gain · Rated easy

Summit panorama

• In its best months now (Mar to Nov)

Indian Peaks' easiest family loop: alpine views without the climb

Nearly flat 3.2-mile Jean Lunning Loop around a 10,674ft alpine lake

3.2 mi round trip, 110 ft of gain · Rated easy

Alpine lakes · Wildflowers

• In its best months now (Jul to Oct)

A half-mile walk into the Indian Peaks Wilderness

Alpine lake just 0.5 miles inside the Wilderness boundary, accessible to all fitness levels

1 mi round trip, 230 ft of gain · Rated moderate

Alpine lakes · Wildlife watching

• In its best months now (Jul to Oct)

Alpine basin under Navajo Peak, 4.6 mi RT from Long Lake Trailhead

Glacial cirque lake at 10,868ft beneath Navajo, Apache, and Shoshoni Peaks

4.6 mi round trip, 440 ft of gain · Rated moderate

Alpine lakes · Wildflowers

• In its best months now (Jul to Oct)

Alpine basin and waterfall via the Arapaho Pass Trail

10,940ft alpine lake reached via the Arapaho Pass Trail

5.4 mi round trip, 875 ft of gain · Rated hard

Alpine lakes · Wildflowers · Waterfall · Creekside

• In its best months now (Jul to Sep)

The Indian Peaks' highest named lake at 12,061ft via Arapaho Pass

12,061ft summit lake, the highest named lake in the Indian Peaks Wilderness

7.1 mi round trip, 1,945 ft of gain · Rated hard

Alpine lakes

• In its best months now (Jul to Sep)