On November 7, 1861, the Colorado General Assembly passed legislation to locate the University of Colorado in Boulder. On September 20, 1875, the first cornerstone was laid for the first building (Old Main) on the CU

Boulder has a temperate climate typical for much of the state and receives many sunny or mostly sunny days each year. Under the Köppen climate classification, the city is considered

Boulder is the principal city of the Boulder, CO Metropolitan Statistical Area.
As of the 2010 census, there were 97,385 people, 41,302 households, and 16,694 families residing in the city. The population density was 3,942.7 inhabitants per square mile

Bolder Boulder
Boulder has hosted a 10 km road run, the Bolder Boulder, on Memorial Day, every year since 1979. The race involves over 50,000 runners, joggers, walkers, and wheelchair racers, making it one of the largest road races in the

The city of Boulder is located in the Boulder Valley, where the Rocky Mountains meet the Great Plains. The Flatirons, slabs of sedimentary stone tilted up on the foothills, are located west

The Boulder MSA had a gross metropolitan product of $18.3 billion in 2010, the 110th largest metropolitan economy in the United States.
In 2007, Boulder became the first city in the United States to levy a carbon tax.
In 2013, Boulder appeared

Outdoor sports
Boulder is surrounded by thousands of acres of recreational open space, conservation easements, and nature preserves. Almost 60%,