Boulder facts
9 Surprising Facts About Boulder, Colorado
Published June 2026 · Updated July 2026
Boulder is more than a pretty backdrop for a film festival. Here are nine genuinely surprising things about the city Sundance now calls home.
1. The city protects its mountain views — by law
Boulder is unusually deliberate about its skyline. A 1959 charter amendment known as the "Blue Line" limits city water service above a set elevation to discourage building high on the mountain slopes, and a voter-approved building-height limit (about 55 feet) keeps downtown low. The result: the Flatirons stay visible from town.
2. It was a pioneer in buying open space
In 1967, Boulder residents voted to tax themselves to buy and preserve open space — widely cited as a first for a U.S. city. Today the city stewards tens of thousands of acres of open space and mountain parks that ring the city and keep it from sprawling into neighboring towns. Learn more.
3. It's a serious science town
Boulder hosts a remarkable cluster of research: federal labs and CU institutes including NIST, NCAR, NOAA, and JILA. Boulder-based physicists have won Nobel Prizes — work on the atomic clock, laser precision, and creating a Bose–Einstein condensate all traces here.
4. The Flatirons are named after laundry irons
The tilted sandstone slabs above town got their name because early residents thought they resembled old-fashioned flat irons. They're the backdrop to Chautauqua and much of Boulder's hiking.
5. Chautauqua has run continuously since 1898
The Colorado Chautauqua is one of the few Chautauquas in the country still operating continuously. A National Historic Landmark, its 1898 auditorium is on the initial venue list for the 2027 festival — see our Venues page.
6. "Mork & Mindy" was set here
Robin Williams' late-'70s sitcom Mork & Mindy was set in Boulder, and the Victorian "Mork & Mindy house" on Pine Street is still a local landmark that fans seek out.
7. Celestial Seasonings tea is a Boulder original
Celestial Seasonings — the herbal-tea company — is headquartered in Boulder, and its factory tour is locally famous for the eye-watering "Mint Room."
8. Pearl Street has been car-free since 1977
The Pearl Street Mall, the brick pedestrian heart of downtown, has been closed to cars since 1977. It's walkable to several festival venues — and to most of our dining picks.
9. It hosts one of America's biggest 10Ks
On Memorial Day, the BolderBOULDER draws tens of thousands of runners through the streets, finishing inside CU's Folsom Field — one of the largest road races in the United States.