Third Flatiron: A Boulder Icon

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.