Can you do this?
Longs Peak — The Keyhole Route — what it takes
Above the Keyhole the route stops being a trail — the Ledges, the Trough, the Narrows, and the Homestretch are marked-but-exposed Class 3 rock where a fall is fatal. It suits fit, experienced hikers comfortable with exposed scrambling, altitude, and a 12-to-15-hour day that starts at 2 or 3 a.m. It is one of the deadliest peaks in the park for people who underestimate it.
- Distance 15 mi
- Time 1 very long day (pre-dawn start)
- Permit No climbing permit (timed entry to park)
- Season Mid-July – early Sept (snow-free)
Not a permit — a weather-and-skill gate. The route is only reasonably safe snow-free, roughly mid-July to early September; outside that window it's a technical mountaineering climb. Afternoon lightning is the killer, so a summit-by-noon turnaround is mandatory, which forces the pre-dawn start. A timed-entry park reservation may still be needed to drive in.
The route, in order
How the route runs
Each stop below is a real place on the park's map — walked in sequence, with how long you spend at each.
- Rocky Mountain National Park Longs Peak Campground Night before
The basecamp
The Longs Peak Campground at the trailhead is where most climbers sleep before the 2–3 a.m. start — tent-only. Starting from the trailhead in the dark is the whole strategy: it lets you summit and get below the Keyhole before afternoon storms.
- Chasm Lake Trail Pre-dawn
The approach
The first hours climb past the Chasm Lake junction toward the Boulder Field below the Keyhole — straightforward trail, done largely in the dark by headlamp. This is your turn-around checkpoint if the weather or your pace is wrong.
- Longs Peak (Keyhole Route) Summit by noon
The Keyhole and summit
Through the Keyhole the hike becomes a scramble — the Ledges, the Trough, the Narrows, the Homestretch — marked by painted bullseyes but seriously exposed. Summit at 14,259 feet, then reverse every move carefully; the descent is where tired climbers make mistakes.
Plan B
If conditions turn
A multi-day route has more ways to go wrong than a dayhike. Here is what forecloses it — and your move when it does.
- Afternoon thunderstorm
Lightning on the exposed upper route is the peak's leading killer; storms build by early afternoon most summer days.
Instead: Start before dawn and turn around by your set time whether or not you've summited — the mountain will be there next year.
- Snow or ice above the Keyhole
Outside the brief snow-free window the route is a technical climb needing axe, crampons, and skills.
Instead: Climb mid-July to early September when it's a scramble, or hire a guide for an early- or late-season ascent. If conditions turn, Chasm Lake is a superb turn-around objective on its own.
Make it happen
Reserve your spot
The route is decided. The only thing between you and the trail is the permit — settle it now, while it's fresh.
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