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United States
Colorado
Boulder County

Three Peaks Loop Trail — Boulder Open Space & Mountain Parks

Routes
Hiking trails & Routes
United States
Colorado
Boulder County

Three Peaks Loop Trail — Boulder Open Space & Mountain Parks

Expert

5.0

(1)

21

hikers

Three Peaks Loop Trail — Boulder Open Space & Mountain Parks

08:34

22.7km

1,270m

Boulder's epic three-peak traverse from Green Mountain to South Boulder Peak via rocky scrambles.

The air is crisp as you start from Gregory Canyon Trailhead, where the Three Peaks Loop …

Last updated: October 3, 2025

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Tips

Includes segments that may be dangerous

Parts of this route comprise highly technical, difficult, or hazardous terrain. Specialist equipment and prior experience is required.

3.63 km in total

Waypoints

A

Start point

Parking

Get Directions

1

311 m

Amphitheater Rock

Highlight • Climb

Amphitheater Rock Trail climbs into a dense, green area. This is a popular area for climbers so there are lots of spur trails at the top leading to different routes.

Tip by

2

3.23 km

Green Mountain Peak

Highlight • Summit

Summer and winter alike, this peak is always accessible and provides very beautiful views especially on the nearby Indian peaks.

Tip by

3

8.62 km

View of Nebel Horn over Boulder

Highlight • Viewpoint

Make sure to look to the east just off the trail here. Spectacular!

Tip by

4

9.97 km

Bear Peak

Highlight • Summit

The trail leads you up the back side of the peak. From the last sign, head up and to the right - the left fork takes you back down into …

Tip by

5

10.9 km

South Boulder Peak

Highlight • Summit

The view of South Boulder Peak, despite the trees burned by recent forest fires is just exceptional. The mountain range is on one side and the Eldorado Canyon on the other. A real wonder.

Tip by

6

12.2 km

Shadow Canyon Trail

Highlight (Segment) • Trail

Shadow Canyon Trail is not for the faint of heart. Whether you are heading uphill or downhill, be prepared for rocks, roots, and formed steps nearly the entire way. There …

Tip by

7

17.8 km

Bear Creek

Highlight • River

Bear Creek crosses the Mesa Trail between the Bear Canyon and Mallory Cave trails. If doing a longer hiking loop, this is a good spot to filter water so that …

Tip by

8

21.6 km

Chautauqua Trailhead

Highlight • Trail

Great parking lot right next to the trailhead. Paid parking starts at 8AM ($2.50 an hour.

Tip by

B

22.7 km

End point

Parking

Way Types & Surfaces

Way Types

17.6 km

3.62 km

877 m

570 m

< 100 m

Surfaces

21.5 km

1.16 km

< 100 m

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Elevation

Elevation

Highest point (2,560 m)

Lowest point (1,750 m)

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Weather

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Wednesday 5 November

17°C

7°C

0 %

If you start your activity now...

Max wind speed: 5.0 km/h

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This route was planned by komoot.

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How to understand each route’s difficulty level

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Intermediate
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Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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How to understand each route’s difficulty level

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Running

Easy
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Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

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Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

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Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
Intermediate

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How to understand each route’s difficulty level

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Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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Mountain Bike

Road Bike

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Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
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Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
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Expert
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Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
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Road Bike

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Easy
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Intermediate
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Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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