Afternoon storm risk is the line that matters. Everything else is comfort. In summer, plan to be off the ridge before the build-up starts, not as it starts. Forecast for the summit point, adjusted for its elevation · data from Open-Meteo.
Centennial 13er · West Ridge
Overview
Atlantic Peak is a Tenmile Range summit between Copper Mountain and Breckenridge. From Highway 91 you walk up Mayflower Gulch on an old mining road, then leave the road and climb steep grass and talus to Atlantic's west ridge. A short walk east along the ridge brings you to the top.
The route is Class 2 with little exposure. It is short but steep: you gain about 2,450 feet in just 2 miles, and much of that is on loose talus and scree above the grass. The upper ridge is high and open, with nowhere to hide from wind or lightning.
The round trip is about 4 miles. Most people take 4 to 6 hours. It is a good half-day peak for hikers who are fine off trail and on loose rock, and it is quick to reach from Summit County.
Plan of the day
Start by
By 6 a.m. The climb is short, but you are above treeline almost the whole time and storms in the Tenmile Range can build early.
Turnaround
If you are not on the west ridge by 10 a.m., or clouds are building, turn around. Leave the summit by 11 a.m.
Crux
The steep, loose talus and scree slope from the gulch up to the west ridge.
Route-finding
The road up Mayflower Gulch is easy. Above it, you pick your own line up the slope to the ridge. In clouds, the slope and ridge can be confusing on the way down; note where you leave the road.
Water
The creek in Mayflower Gulch runs near the road. There is no water on the slopes or ridge. Filter creek water; there is old mining in the gulch.
From I-70, take the Copper Mountain exit and head south on Highway 91 toward Fremont Pass and Leadville. Drive about 6 miles. The Mayflower Gulch trailhead parking lot is on the east (left) side of the highway.
The lot is right off the paved highway and any car can reach it. It is popular with hikers in summer and skiers in winter, so arrive early on weekends.
RoadTundraTalus and screeRidgeExposed to lightning
The line is elevation, the band underneath is the ground, and the numbered dots match the steps below. Mileage and elevations are approximate.
1
Mayflower Gulch trailhead 11,000' · 0 mi
Start on the old mining road leaving the east side of the lot. It climbs gently into the trees.
2
Lower gulch road 11,100' · 0.2 mi
The road follows the creek up Mayflower Gulch through thinning forest. The footing is rocky in places but easy.
3
Upper gulch road 11,250' · 0.4 mi
The trees open up and you see the high peaks ringing the head of the gulch. Old mining ruins sit farther up the valley.
4
Leave the road 11,450' · 0.8 mi
Look ahead and pick out Atlantic's west ridge rising to the east. Leave the road and head toward the grassy slopes below the ridge.
Watch for: Mark where you leave the road so you can find it on the way down.
5
Grassy slopes 11,800' · 1 mi
Climb steep grass and tundra. The ground is soft and easy but steep. Choose a line that stays on grass as long as you can.
6
Upper grass 12,200' · 1.2 mi
The grass thins and rock starts to take over. The slope gets steeper still. Take short steps and rest often.
7
Talus and scree 12,700' · 1.45 mi
Climb loose talus and scree toward the ridge. Rocks can slide underfoot. Stay close together or spread out sideways so no one is below someone else.
Watch for: Loose rock. Do not climb directly below other people.
8
West ridge 13,300' · 1.7 mi
Reach the crest of the west ridge. The ridge is wide enough to walk comfortably. Turn east and follow it toward the summit.
Watch for: Wind can be strong on the ridge. Check the sky here.
9
Upper ridge 13,650' · 1.85 mi
Walk the ridge over broken rock. Stay near the crest where the footing is best.
10
Summit 13,856' · 2 mi
The summit is small and rocky. Quandary Peak rises to the southeast, and Pacific Peak is close by to the north. Look back and pick out your line down to the gulch before you leave.
Here Humbug Gulch goes off straight ahead. Keep right to follow Mayflower Gulch Road.
Coming down: Keep going straight on Mayflower Gulch Road. Don’t take Humbug Gulch.
2Mile 1.1 · 12,000'
Turn right to stay on Mayflower Gulch Road
Here an unmarked path goes off to the left. Turn right to follow Mayflower Gulch Road.
Coming down: Turn left to stay on Mayflower Gulch Road. Don’t take the unmarked path.
Landmarks to know
Mayflower Gulch lot on the east side of Highway 91
Old mining road climbing through the trees
Mining ruins in the upper gulch
Atlantic's west ridge rising east of the gulch
Grass giving way to talus and scree
Rocky summit with Quandary Peak to the southeast
Getting down
Return west along the ridge to the point where you came up. Do not drop off the ridge too early; the slopes below can have cliffs and steep gullies. In clouds, use a GPS track to find your exit point.
Going down the talus and scree is where most slips happen. Take small steps and keep your weight over your feet. Once on the grass, head down to the road and follow it back to the lot.
If things go wrong
The gulch and the road are your safe ground, and they are never far away. If a storm builds, get off the ridge and back down to the grass and the road as fast as is safe. If someone is injured, keep them warm, mark your location, and call 911. Highway 91 is close, so help can arrive faster here than on most peaks.
3D flyover
Press play to fly the West Ridge. The graph shows elevation along the way and how much you gain each mile. Open full screen.
For planning only. The line is traced from open map data, not walked in the field, and off-trail parts are drawn straight. Load it in your GPS app to see the route, but navigate with your eyes, a map and the route description.
See the trail on video
A climb of this route filmed by Karl Decker Presents. The video belongs to them and only plays when you press play. This video covers Pacific and Atlantic together.
Other routes
Every way up Atlantic Peak we list, with its class.
This describes the route on a dry summer day. Snow, ice, a washed-out road or an afternoon storm can make it a very different climb. Check recent conditions the week you go and turn around when the day tells you to.