Longs Peak Trail

The Longs Peak Trail is a 13.5-mile (21.7 km) out-and-back summit route in Rocky Mountain National Park, Colorado, USA, ascending 5,140 feet (1,567 m) to a summit at 14,259 feet (4,346 m) via the iconic Keyhole Route. Rated strenuous with Class 3 scrambling above 13,000 feet, it is Colorado's northernmost fourteener and one of the most dramatic alpine summit routes in the contiguous United States.

About the Longs Peak Trail

Rising sharply above the eastern flanks of Rocky Mountain National Park, Longs Peak dominates the skyline over Estes Park and holds a distinguished place in American mountaineering history. It was first summited in 1868 by John Wesley Powell — one year before his famous Colorado River expedition — and today attracts tens of thousands of climbers each season chasing its broad, table-like summit platform across some of the most dramatic exposed terrain in the Rockies.

The standard route to the top is the Keyhole Route, a 13.5-mile round trip that combines solid trail hiking through subalpine forest and alpine tundra with genuine Class 3 scrambling on loose and polished granite above 13,000 feet. The lower half is a well-maintained, clearly marked path; the upper half — from the distinctive Keyhole rock arch to the summit — demands route-finding confidence, a tolerance for significant exposure, and steady hands on technical terrain. According to the Rocky Mountain National Park Longs Peak page, the route is recommended only for experienced hikers in good physical condition.

At 14,259 feet (4,346 m), Longs Peak sits well above the threshold where altitude begins to measurably reduce performance. Hikers travelling from sea level should spend at least two nights in Estes Park (7,522 ft / 2,293 m) before attempting the summit — poor acclimatization accounts for a significant share of turned-around and rescued parties each summer. Fuelling properly at altitude is equally important; our article on how many calories you need hiking a full day breaks down the energy requirements for long, strenuous mountain days.

The trailhead sits 1 mile up Longs Peak Road off Colorado State Highway 7. Parking is limited and fills completely before sunrise on summer weekends — an early start is not optional but structural to successfully completing this hike.

Route Overview & Stages

The Keyhole Route runs entirely out-and-back from the Longs Peak Trailhead at 9,400 feet (2,865 m). There are no loop alternatives — every foot of gain is reversed on descent. The six stages below are measured one-way from the trailhead. For detailed route-finding notes on the technical upper sections, the 14ers.com Keyhole Route description is the most thorough community resource available.

Total round trip: 13.5 mi (21.7 km)  ·  Total elevation gain: 5,140 ft (1,567 m)  ·  Summit elevation: 14,259 ft (4,346 m)

Highlights & Points of Interest

• Longs Peak Trailhead (9,400 ft / 2,865 m) — The starting point on Longs Peak Road, 1 mile off Colorado Highway 7. A small ranger station, toilets, and a packed gravel parking area are located here. Arrive before 3 a.m. on summer weekends or expect to park a mile down the road and walk in.
• Goblin's Forest — A dense stand of wind-sculpted subalpine fir at roughly 1.5 miles, where the trail forks between the East Longs Peak Trail and the North Longs Peak Trail. Both converge above treeline. The gnarled trees and low light at pre-dawn make this a memorable stretch.
• Chasm Lake Junction (11,580 ft / 3,530 m) — At 3.2 miles, a signed spur drops 0.9 miles to Chasm Lake, a glacial tarn sitting directly beneath the vertical 2,000-foot East Face of Longs Peak. The view from the lakeshore on a clear morning is among the finest in Rocky Mountain National Park.
• Battle Mountain Saddle (12,080 ft / 3,682 m) — A broad, open shoulder where the trail crests before descending slightly to Boulder Field. On clear days you can see south to Mount Meeker and north across Wild Basin toward the Never Summer Mountains.
• Boulder Field (12,760 ft / 3,890 m) — A vast plateau of granite boulders roughly 5 miles from the trailhead and 1 mile below the summit. The only permitted backcountry campsites on the route are here. The Agnes Vaille Shelter — a stone emergency hut — marks the transition from hiking to scrambling.
• The Keyhole (13,150 ft / 4,009 m) — A dramatic rock window eroded through a granite ridge and named for its key-shaped silhouette. Stepping through it reveals the sheer west-face exposure and the entire upper route ahead, marked from here to the summit by red-and-yellow painted bulls-eyes on the rock.
• The Trough — A steep 600-foot gully of loose scree and boulders that constitutes the crux section for most parties. Snow or ice lingers in The Trough well into July most years, and microspikes or crampons are essential before the snow melts fully. Careful foot placement and a slow pace matter more than speed here.
• The Summit (14,259 ft / 4,346 m) — A surprisingly flat, table-like platform roughly 200 yards across. On clear days the views extend from Denver's skyline (60 miles south) to Wyoming's Snowy Range (40 miles north) and west to the Gore Range and Tenmile Range.

Best Time to Hike the Longs Peak Trail

The Keyhole Route has a narrow seasonal window defined by two forces working against each other: snow blocking the upper route from October through mid-June, and afternoon thunderstorms building almost daily from July onward. Being above The Keyhole after noon means serious lightning exposure — this is not a guidebook caution but a genuine life-safety constraint.

As of 2026, the optimal hiking season runs from mid-July through mid-September. July brings the earliest reliable snow-free conditions in The Trough, though microspikes remain strongly recommended for the first half of the month. August is statistically the most stable weather month on the peak: overnight summit temperatures drop to 25–35°F (-4 to 2°C), morning windows are consistently clear, and afternoon convection is marginally less aggressive than in July. September offers cooler temperatures, noticeably thinner crowds, and brilliant high-pressure clarity — but the first significant autumn snowfall can arrive without warning after early September and close the upper route overnight.

The single best month is August. Combined snow-free conditions, reliable morning stability, and the widest weather windows make it the safest month to plan a summit attempt. A 3 a.m. start from the trailhead puts most hikers on the summit by 10–11 a.m. and off the exposed upper route well before afternoon storms build.

Practical Information

Accommodation

Most hikers base themselves in Estes Park (7,522 ft / 2,293 m), a small mountain town 7 miles from the trailhead that provides the acclimatization buffer critical to summit success. Spending two nights in Estes Park before your attempt meaningfully increases your chances of reaching the top.

• Estes Park hostels and backpacker lodges — Budget dorm beds run approximately €25–40 per night during peak season (July–August). Book 4–6 weeks out as summer inventory fills fast.
• Mid-range motels and vacation rentals — Expect €80–160 per night for a private room. Dozens of properties line the Highway 34 and Highway 36 corridors into town.
• Boulder Field Backcountry Campsite (12,760 ft / 3,890 m) — The only legal overnight camping on the Keyhole Route. Sites cost approximately €20–25 per night (advance reservation fee via Recreation.gov plus per-night charge). Maximum 2 consecutive nights. No campfires; bear canister required.
• Longs Peak Campground — A tent-only NPS campground at the trailhead (9,400 ft / 2,865 m) with 26 sites at approximately €28–32 per night. No hookups. Summer reservations fill well in advance on Recreation.gov.

Getting There & Back

The nearest commercial airport is Denver International Airport (DEN), approximately 80 miles (129 km) southeast of Estes Park — a 90-minute drive under normal traffic conditions. Rental cars are the most practical option as no direct public transport connects Denver airport to the Longs Peak Trailhead.

Driving from Denver: take I-25 North toward Loveland, then follow US Highway 34 West through the Big Thompson Canyon to Estes Park. From Estes Park, take Colorado Highway 7 South for 9 miles to the Longs Peak Road sign and turn right; the trailhead parking lot is 1 mile up the road. Total drive time from Denver airport: approximately 100 minutes.

The Estes Park Shuttle operates seasonal service (June–September) from certain Front Range transit hubs into Estes Park. Once in town, a taxi or rideshare covers the 9 miles to the trailhead. Note that within Rocky Mountain National Park the Hiker Shuttle Express serves several popular trailheads but does not stop at Longs Peak — private transport remains necessary for the final leg.

Permits & Fees

• Rocky Mountain National Park entrance fee: $35 per vehicle (7-day pass) or $20 per individual hiker on foot or bicycle. The America the Beautiful Annual Pass ($80 / approx. €73) covers the entrance fee year-round for all NPS sites and pays for itself on two or more visits.
• Day hiking: No reservation or permit required for day hikes to the summit. The trailhead is accessible 24 hours a day year-round.
• Overnight camping at Boulder Field: A backcountry camping permit is required, costing approximately $26 reservation fee plus $8 per person per night. Permits are released 6 months in advance on Recreation.gov and peak-season slots (July–August) typically sell out within hours of release.
• Timed-entry reservations: Rocky Mountain National Park has operated timed-entry systems in recent summers to manage crowd pressure at peak periods. Check the NPS website before booking your trip as this policy changes annually.

Gear & Packing List

Longs Peak demands genuine preparation. The Class 3 scrambling above The Keyhole, combined with the altitude, real lightning exposure, and a 13.5-mile round trip, means that cutting corners on gear creates avoidable risk. The choices you make at the trailhead at 3 a.m. shape the entire day.

Backpack: For a day hike, a 20–30-litre pack balances enough carrying capacity (3–4 litres of water, food, layers, headlamp, first aid) against the weight penalty of a larger load on steep terrain. The Hyperlite Mountain Gear Aero 28 excels here — ultralight Dyneema construction, fully waterproof, and a suspension system that stays stable through the scrambling sections. Parties overnighting at Boulder Field should step up to the Zpacks Arc Haul Ultra 50L, which carries two days of alpine gear at under 500 grams pack weight. Those wanting a more affordable and burly option for multiple mountain trips should consider the Osprey Aether 65 with its full suspension and bomber construction.

For a deep comparison of ultralight packs for routes like this, see our tested roundup: Best Ultralight Backpacks of 2026: 7 Packs Tested and Ranked.

Full packing list for Longs Peak:

• Headlamp with fresh batteries or a spare set (essential for a 3 a.m. start in the dark)
• 3–4 litres of water — no reliable water sources above the treeline junction; carry all you need
• Microspikes or crampons — mandatory before mid-July, worth carrying through August when The Trough can hold ice patches late in the season
• Waterproof hardshell jacket — summit winds can reach 40+ mph even in August; a shell is non-negotiable
• Insulating mid-layer — fleece or lightweight down for the summit and during rest stops above The Keyhole
• Sturdy, stiff-soled hiking boots — trail runners are marginal on the Homestretch's polished granite slabs; full leather or synthetic mountain boots perform significantly better
• Trekking poles — useful on the descent through The Trough where loose scree creates ankle-rolling terrain
• High-calorie snacks — aim for 300–400 kcal per hour; appetite suppresses at altitude so plan food you will actually eat
• First aid kit, emergency whistle, and compact space blanket
• Downloaded offline map or GPS device — cell signal is absent above treeline
• Sun protection: wide-brim hat, SPF 50+ sunscreen, UV-blocking sunglasses — UV radiation at 14,000 ft is approximately 50% more intense than at sea level
• Warm hat and lightweight gloves — even August summit temperatures can touch freezing before sunrise

Similar Trails You Might Like

Longs Peak sits at the heart of one of America's greatest concentrations of high-altitude summit routes. Whether you are building toward this route or looking for the next challenge after bagging it, these trails share its scale, drama, or technical character.

• Mount Whitney Trail — At 14,505 feet (4,421 m), Whitney is the highest peak in the contiguous US. Its main trail is longer at 22 miles round trip and less technical than Longs, but shares the same alpine-start logistics and the same permit competition pressure.
• Half Dome Trail — Yosemite's signature summit hike, featuring its own cable-assisted Class 3 finish and a strict permit lottery. Lower altitude than Longs Peak (8,839 ft / 2,694 m) but comparable in commitment and exposure.
• Angels Landing Trail — A shorter but intensely exposed sandstone scramble in Zion National Park, Utah. An excellent route for building comfort with serious exposure before tackling the Narrows and Homestretch on Longs Peak.
• Pacific Crest Trail — For hikers ready to commit to a multi-month journey after experiencing the Rockies, the PCT's 4,265 km from the Mexican border to Canada passes through a lifetime of varied alpine terrain.
• Continental Divide National Scenic Trail — At 4,988 km through the spine of the Rockies from New Mexico to Montana, the CDT passes within sight of Longs Peak. The Colorado section alone offers weeks of sustained high-country hiking above 11,000 feet.

Frequently Asked Questions

When is the best time to hike the Longs Peak Trail?

August is the optimal month. The Keyhole Route is reliably snow-free, morning weather windows are widest, and summit temperatures average 25–35°F (-4 to 2°C). The overall safe season runs mid-July through mid-September. July requires microspikes and strict timing; early September is beautiful but early autumn snow can close the upper route overnight. Avoid attempting the route outside this window unless you carry full technical mountaineering gear.

How difficult is the Longs Peak Trail?

The trail is rated strenuous and involves genuine Class 3 scrambling above The Keyhole at 13,150 feet. The lower 5 miles follow a clear, well-graded alpine path; the upper section demands route-finding using painted bulls-eye markers, comfort with sustained exposure, and steady movement on both loose scree and polished granite. Prior scrambling experience is strongly recommended. Altitude affects nearly everyone — plan for at least two nights acclimatizing in Estes Park before your summit day.

How far do hikers cover per day on this trail?

Longs Peak is almost always completed in a single long day: 13.5 miles (21.7 km) round trip with 5,140 feet (1,567 m) of total elevation gain. Allow 10–15 hours depending on fitness and conditions. A 3 a.m. trailhead start targets a summit by 10–11 a.m., leaving adequate margin to descend below the exposed upper sections before afternoon thunderstorms build. Parties who prefer splitting the effort can overnight at Boulder Field (permit required) and summit on day two.

Where do hikers stay near the Longs Peak Trail?

Most hikers base themselves in Estes Park, 7 miles from the trailhead, where hostel dorms run €25–40 per night and mid-range lodging costs €80–160 per night. The only permitted backcountry camping on the route itself is at Boulder Field (12,760 ft / 3,890 m), costing approximately €20–25 per night with an advance reservation through Recreation.gov. The NPS tent-only Longs Peak Campground at the trailhead runs approximately €28–32 per night.

Do you need a permit to hike Longs Peak?

Day hikers need no specific trail permit — only the standard Rocky Mountain National Park entrance fee ($35 per vehicle for a 7-day pass, roughly €32). Overnight camping at Boulder Field requires a backcountry permit ($26 reservation fee plus $8 per person per night), released 6 months ahead on Recreation.gov; peak-season slots sell out within hours. A park-wide timed-entry reservation may also be required depending on the season — check the NPS website before your trip as this policy changes annually.