Flattop Mountain is a beautiful mountain located near Bear Lake in Rocky Mountain National Park. It features gradual, but strenuous gains, stunning views, and is a fantastic year round hike.

Difficulty: Strenuous

Distance: 8.9 Miles Round Trip (14.32 Km)

Elevation: 12,324 Feet (3,756 M)

Duration: About 6 Hours

Elevation Gain: 2,850 Feet (868.7 M)

Trail Maps

Flattop Mountain Colorado Trail Map

Trails

Flattop Mountain Trail

The flattop mountain trail is the main trail to hike to the summit of Flattop Mountain. There are a couple variations that are common for hikers to take. The most common of which begins at Bear Lake.

Bear Lake Trail to Flattop Mountain – 8.9 Miles Round Trip – 12,324 feet of elevation gain

This route begins at the end of Bear Lake Road, an extremely popular area in Rocky Mountain National Park. During peak season, it is recommended to take the park’s shuttle to the trailhead. This trail begins along the bear lake trail encircling the lake where hikers will quickly bear right towards the Flattop Mountain trail and Lake Bierstadt.

.5 miles after that right turn, hikers reach a junction in which they need to turn a hard left towards the Flattop Mountain Trail. A right turn will lead hikers towards Bierstadt lake (an alternate route up Flattop Mountain).

Once turning left, the trail begins to get gorgeous views of Bear Lake, Longs Peak, and much more. 1.7 miles into the hike (at around 10,500 feet), there is an overlook of Dream Lake. Treeline is reached around 2.4 miles into the hike.

At mile three, hikers will reach the Emerald Lake Overlook, which is one of the most stunning viewpoints of the hike. The viewpoint sits roughly 1,200 feet above the lake, and features views of Hallet Peak, the lake down below, and a look at some steep incline soon to come.

The rest of this hike is stunning at all moments with views in nearly all directions. The summit of Flattop Mountain (unmarked) is located at the trail junction 4.45 miles into the hike. Hikers have the choice to continue on to Hallet Peak with an additional .7 miles and about 400 feet of elevation gain as seen on the trail map.

Bierstadt Lake Trail – 13.8 Miles Round Trip

This trail begins at the Bierstadt Lake parking area. Hikers will ascend the Bierstadt Morraine to Lake Bierstadt in 1.2 miles, and then turn left towards Flattop Mountain. This option ads a bit of distance to the overall hike as well as elevation gain. This is a great option for those looking to add a little difficulty, or test out a new route, though much of the hike is the same.

Hiking In Winter

Flattop is a great winter hiking option due to its popularity, gradual incline, and stunning views. Microspikes or snowshoes are essential in most winter situations, with snowshoes being necessary dependent on snow conditions. The normal winter hiking precautions and gear should be taken.

Directions & Parking

During peak season, hikers should use the park shuttle. Information on the shuttle can be found here: https://www.nps.gov/romo/planyourvisit/shuttle_bus_route.htm

To Bear Lake Parking Area

To Bierstadt Lake Parking Area

Current Weather Conditions

Grand Lake, CO

This Afternoon
Showers and thunderstorms. Mostly cloudy. High near 46, with temperatures falling to around 44 in the afternoon. Northeast wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.

Tonight
Showers and thunderstorms likely before 9pm, then a slight chance of thunderstorms and rain and snow showers likely. Partly cloudy. Low around 33, with temperatures rising to around 36 overnight. South wind 3 to 7 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.

Sunday
A slight chance of snow showers and a slight chance of thunderstorms before 7am, then a slight chance of thunderstorms and a slight chance of rain and snow showers between 7am and noon, then a chance of thunderstorms and rain and snow showers likely. Mostly sunny. High near 49, with temperatures falling to around 47 in the afternoon. West southwest wind 3 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

Sunday Night
A chance of thunderstorms and rain and snow showers likely before midnight, then a slight chance of thunderstorms and a slight chance of rain and snow showers. Partly cloudy, with a low around 34. Southwest wind 5 to 12 mph. Chance of precipitation is 60%.

Monday
A chance of thunderstorms and rain and snow showers. Partly sunny, with a high near 47. West wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 80%.

Monday Night
A chance of thunderstorms and rain and snow showers likely before midnight, then a slight chance of thunderstorms and a slight chance of rain and snow showers. Mostly cloudy, with a low around 35. Chance of precipitation is 70%.

Tuesday
A chance of thunderstorms and rain and snow showers likely. Partly sunny, with a high near 46. Chance of precipitation is 70%.

Additional Pictures

Views from Flattop Mountain Trail