Trails · Rocky Mountain National Park
Flattop Mountain Trail
The great gateway to the Continental Divide above Bear Lake — a strenuous tundra climb to a broad 12,324-foot summit, with Hallett Peak a short walk beyond and the whole park spread out at your feet.
Toggle Terrain / USGS Topo / Satellite / Street (top-right) · route © COTREX/CPW · tap a marker for waypoints
Flattop Mountain is the classic way for hikers (no technical climbing) to stand on the Continental Divide in Rocky Mountain National Park. From the Bear Lake trailhead it climbs steadily — past the overlooks above Dream and Emerald Lakes and the Bierstadt Moraine — then switchbacks up through the last trees and out onto open alpine tundra, gaining roughly 2,850 feet over about 4.45 miles to the flat, wind-scoured 12,324-foot summit.
From the top the reward is the whole park: Longs Peak, the Mummy Range, and range after range along the Divide. Hallett Peak rises just 0.4 mile and 400 feet to the south for those with gas left in the tank, and the Tonahutu and North Inlet trails drop off the far side toward Grand Lake for epic point-to-points. This is serious high country: almost the entire upper half is above treeline, so afternoon lightning is a real danger — start before dawn. National Park land: no dogs, and a timed-entry / Bear Lake Road permit is usually required in summer.
Trail Facts
Difficulty
Strenuous (high alpine)
To the summit
4.45 mi one-way (~8.9 mi round trip)
Summit
12,324 ft (Continental Divide)
Elevation Gain
~+2,850 ft
Add-on
Hallett Peak, +0.4 mi / +400 ft
Bikes
Not allowed (National Park)
Dogs
Not allowed (National Park)
Season
Summer–early fall (snow lingers)
Manager
Rocky Mountain National Park
Getting There
From Estes Park, enter RMNP and take Bear Lake Road to its end at the Bear Lake Trailhead (timed-entry + Bear Lake Road permit usually required in summer; use the free shuttle). The Flattop Mountain Trail leaves from the Bear Lake area. No water beyond the trailhead.
| 0.0 mi | Bear Lake Trailhead |
| ~1.5 mi | Dream Lake & Emerald Lake overlooks |
| ~2.5 mi | Above treeline onto the tundra |
| 4.45 mi | Flattop Mountain summit, 12,324 ft — the Continental Divide |
| +0.4 mi | Hallett Peak (optional) |
Know Before You Go
- Start before dawn. Most of the upper trail is above treeline — be off the summit before midday thunderstorms, which are deadly up here.
- National Park rules. No dogs; timed-entry + Bear Lake Road permit usually required in summer.
- Real alpine. ~8.9 miles and 2,850 feet at high altitude — be fit, acclimated, and carry layers, food, and water.
- Bag Hallett too. An easy 0.4-mile tundra walk from Flattop adds the pointed summit of Hallett Peak.
- Snow lingers. Expect snowfields on top into summer; check conditions.
Built by Many Hands — Give a Little Back
Love this guide? Wear it. Every hat, tee, and cozy layer in our Red Feather Lakes collection helps us keep mapping trails and keeping this guide free — mountain apparel designed right here in the high country, with more trail gear on the way.
Shop the Collection →These trails don't tend themselves either. Every mile is watched over by volunteers and public stewards we lean on to bring you this guide — if you love these mountains, please pitch in for them too:
- Poudre Wilderness Volunteers — trail patrols & the official trail description Donate →
- Colorado Parks & Wildlife / COTREX — the mapped trail route & statewide trail data Donate →
- Arapaho & Roosevelt National Forest (USFS) — the public land itself Support →
- OpenStreetMap contributors — the Street basemap Donate →
- Google & USGS — trailhead location, ratings & topographic maps
Trail details compiled by the Red Feather Lakes Travel Guide from the sources above. Photography by us — more of our own trail images coming as we hike them.