First and Second Flatirons Loop is a 2.5 mile heavily trafficked loop trail located near Boulder, Colorado that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, running, rock climbing, and snowshoeing and is best used from April until October. Dogs are also able to use this trail.

Length2.5 miElevation gain1,440 ftRoute typeLoop
HikingRock climbingSnowshoeingRunningDog friendlyForestViewswild-flowersWildlifeRockyScramble
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Getting There

Note: As of November, 2020, the 1st/2nd Flatiron Trail will be closed from 8 am to 4:30 pm every Monday through Thursday into the fall while repair work is completed. Climbers may access the First Flatiron and then climb down through the project area, with delays possible. For more information, please see https://bouldercolorado.gov/osmp/temporary-closures#:~:text=1st%2F2nd%20Flatiron%20Trail%20work,project%20area%2C%20with%20delays%20possible. The flatirons are striking, tilted, sandstone rock slabs that form Boulder's beautiful backdrop. There are five distinct flatirons on the western side of Boulder. The route on this page takes you to two of the most popular. This seamless transition from urban to wilderness is why people love Colorado. The mountains of the Boulder Open Space loom over Boulder inviting people to come explore. There are two trailheads for this route. The route shown on this page has the hiker starting at the Chautauqua Trailhead. A little to the east is the Enchanted Mesa Trailhead. This trail can be quite rocky, and there is some scrambling involved. In the winter, this route is much more difficult requiring spikes and route-finding experience.

There are restrooms and a tourist information center at the trailhead.

Boulder Open Space phone number: (303) 441-3440

This trail gets incredibly crowded, so get there early!

Directions from Highway 36: Take the Baseline Road exit and travel west toward the mountains. Follow Baseline Road 1.5 miles passed the entrance for Chautaugua Park to the Gregory Canyon Trailhead. Turn left into the parking lot on a dirt road. A parking fee is charged at this trailhead for vehicles not registered in Boulder County or not displaying a Boulder Resident Permit. Permits can be obtained at the trailhead or at the Chautaugua Park Rangers Cottage.

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Reviews (1,603)
Photos (2,606)
Recordings (1,003)
Completed (6,435)
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Jordan Ventresco
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 22, 2021
Hiking

Little icy but overall a lot of fun, started to do 1/2 flatiron out and back but it was closed halfway up

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Emily Farrer
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 21, 2021
Hiking

There were people doing the trail without spikes, but it looked pretty miserable. Can confirm that spikes are worth the investment.

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Alana Friend
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 21, 2021
HikingGreat!Snow

Beautiful! Pretty busy best to go during the week if possible. With the snow (late feb) couldn’t safely make it allll the way to the top but regardless it was gorgeous! Wore snow boots but would have been nice to have spikes

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Tom Hyde
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 20, 2021
HikingSnow

The perfect hike. Not too steep, not too busy, not too long. Fantastic payoffs along the way.

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spencer kates
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 20, 2021
Hiking

Spikes not essential but pretty necessary .

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Eric Kean
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Hiking
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Alan Galvan
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Hiking

amazing must do trial while you’re in Boulder! The views were amazing and not too crowded during late February.

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Nathan Williams
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 9, 2021
Walking

beautiful trail. lots of opportunities for relatively safe, small detours at the peak of the trail that lead to great views

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Michael Cooper
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No ice today, great conditions.

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JT Nelms
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Hiking

fantastic day. only ice was on the sidewalk on the way up. a lot of people out having a great time!

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Alissa Nelms
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Hiking
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Mitchell Morici
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 2, 2021
HikingGreat!

Great hike, awesome views, microspikes were helpful on 2 short sections but not needed, minimal/no snow at the top.

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Breta Alstrom
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJanuary 31, 2021
Hiking

Icy on and off in the middle section. Would recommend micro spikes.

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Corbin Dorfner
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HikingIcy
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Brandon Alpizar
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Hiking
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Mike Mastrandrea
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Hiking
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Lance Steinberger
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Hiking

nice diverse terrain

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Aaron Lerch
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Hiking

Always one of my favorite 3 milers

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Autumn S
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJanuary 20, 2021
Hiking

A little icy in some parts

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Patricie Stephens
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HikingGreat!

Difficult but gorgeous!

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Axel Loecken
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Hiking
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Colin Runnion
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Hiking
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S Cut
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HikingIcy
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chadd olson
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Hiking
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Madeline Reich
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJanuary 9, 2021
Hiking

Even getting lost the trail was great! Well traveled by others. Coming down the ice was tricky. If you can do it without a couple falls, props!

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Alaina Howell
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJanuary 9, 2021
HikingIcyScramble

Great trail, amazing views. Main trail is VERY icy. Overall absolutely beautiful.

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Siddhant Keshkar
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJanuary 6, 2021
HikingGreat!IcyRockyScrambleSnow

Very icy, microspikes recommended, difficult trail, but definitely worth the views.

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