A view of the first and second flatirons from the top of the third at sunriseThe Flatirons are a series of rock formations just outside of Boulder in Chataqua Park.  They are iconic for local businesses, many of which incorporate views of the flatirons into their logos. There are many established Rock Climbing routes on and around the flatirons.

There are five numbered flatirons, ordered from north (the first) to south (the fifth).