Third Flatiron: A Boulder Icon

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Hike or climb this iconic sandstone formation for panoramic views and a taste of Boulder's outdoor spirit. A Colorado landmark!

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Third Flatiron

The Third Flatiron, a towering sandstone formation near Boulder, Colorado, is a popular destination for hikers and climbers alike. With its distinctive shape and stunning views, it's a must-see landmark steeped in local history and climbing lore.

A brief summary to Third Flatiron

Boulder, Colorado, 80302, US
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Monday 5 am-11 pm
Tuesday 5 am-11 pm
Wednesday 5 am-11 pm
Thursday 5 am-11 pm
Friday 5 am-11 pm
Saturday 5 am-11 pm
Sunday 5 am-11 pm

Local tips

Parking at Chautauqua Trailhead is limited, especially on weekends. Arrive early or use the free Park to Park shuttle.
The Third Flatiron's East Face is a popular climbing route for beginners, but be prepared for a strenuous hike to the base.
Check for seasonal closures due to raptor nesting, typically from February to late July.
Bring plenty of water and sun protection, as the trails are exposed and can be hot in the summer.
Look closely to see the faint outline of the "CU" letters painted on the rock face in the mid-20th century.

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Getting There

Walking

From the Chautauqua Trailhead, follow the signs towards the Third Flatiron Trail. The trail gradually ascends through a wooded area before becoming steeper as it approaches the base of the Flatiron. The hike to the base takes approximately 45 minutes. Be prepared for a rocky and uneven path. No fees are required for accessing the trail.
Public Transport

From Downtown Boulder Station, take the bus to the Broadway & Baseline Road stop. Several bus lines serve this stop, including the 225D, DASH, FF1, FF2, and FF5. From the bus stop, walk west along Baseline Road to the Chautauqua Trailhead. The trailhead is located on the south side of Baseline Road. The bus fare is approximately $3. The walk from the bus stop to the trailhead is about 15 minutes.
Driving

From Denver, take Highway 36 west to Boulder. Exit at Baseline Road and head west. Continue on Baseline Road until you reach Chautauqua Park on the left. Parking is available in the Chautauqua Park area, but it is limited, especially on weekends. During the summer months (Memorial Day to Labor Day), paid parking is in effect from 8 am to 5 pm, costing $2.50 per hour. Payment can be made via the Parkmobile app or at kiosks located near the Ranger Cottage and on Baseline Road. Free parking is available on Baseline Road between Labor Day and Memorial Day. A free shuttle service operates during the summer months to alleviate parking congestion.

Discover more about Third Flatiron

The Third Flatiron, one of five prominent rock formations rising west of Boulder, Colorado, has been a symbol of the city for over a century. Part of the Fountain Formation, these geological wonders date back approximately 300 million years. The Third Flatiron, in particular, stands as a testament to both natural beauty and human ambition, drawing hikers and climbers from around the world. Visible from miles away, the Flatirons were initially known as the "Chautauqua Slabs" around 1900. The name "Flatirons" is believed to have originated either from their resemblance to old-fashioned clothes irons or the Flatiron Building in New York City. The Third Flatiron has a rich climbing history, with the first ascent of the Standard East Face recorded in 1906. In 1919, Hull Cook and Ev Long installed six prominent eyebolts on the East Face, which are still used today as belay anchors. For many years, the Third Flatiron displayed large white letters spelling "CU" for the University of Colorado. Painted by CU students in the mid-20th century, these letters became a beloved, if controversial, landmark. Although the city eventually painted over them in the 1980s to restore the natural appearance, the faint outline of the letters can still be seen. Today, the Third Flatiron continues to inspire awe and adventure. Its moderate climbing routes make it a favorite for beginners, while its historical significance and stunning views make it a must-visit destination for anyone exploring the Boulder area.

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