Boulder City incorporated.
Boulder's first bank, the Bank of Boulder, established.

The new Boulder train depot at the corner of 14th and Water Streets dedicated. (Water Street would be renamed Canyon Boulevard the following year.)
The Boulder Pressed Brick Company opened. Many Victorian homes found on Mapleton Hill of Boulder were built with their pressed brick.

June 24: The Boulder Street Railway launched after rail tracks and power lines were installed and 12 brown and yellow cars arrived by train. The fare was five cents.
June 25: Three Denver newspapers published a story that the Chinese government was planning to demolish the Great Wall of China. The story is later proved to be erroneous.
Tungsten discovered in the local area. Boulder County became world's leading producer of tungsten by World War I, yielding 2,800-3,000 tons from a total production of 5,900 tons.

June 8: President Theodore Roosevelt signed the Antiquities Act into law, authorizing the president to restrict use of certain public lands with historical or conservation value.
June 29: Mesa Verde in southwest Colorado declared a National Park.
August 22: First Victor Victrola, a phonographic record player, manufactured. Future guests of the Hotel Boulderado will listen to orchestra music on one stationed in the lobby.
December: Boulder City Council discussed Boulder's need for growth and decided that a luxury hotel would ensure the city's future.
During the course of the year, Albert Einstein published four papers, formulated his theory on special relativity, and explained the photoelectric effect by quantization. It is regarded as Einstein's "miracle year."
The fore-runner to the Chamber of Commerce, the Boulder Commercial Association, organized with the goal to spread the word that Boulder was "the place to live," work, and make a profit.

September 27: Henry Ford produced his first Model T automobile.
December 31: Hotel Boulderado's gala opening reception. Locals came in to inspect the rooms and furnishings. Among the visitors was a future owner and manager, Hugh Mark.
First run of electric Interurban train from Denver to Boulder.
World's largest tungsten mill built north of Nederland, Colorado.
The Central Colorado Power Company started construction on the Barker Dam near Nederland.

January 1: Hotel Boulderado opened. The Commercial Association moved its headquarters to the new city landmark.
September 20: Construction on the University of Colorado's Macky Auditorium began.
The Union Pacific Railroad introduced a self-contained forty-two-passenger rail car on its Denver-Boulder route. The 78' car was powered by a six-cylinder gasoline engine, offered seats of "unusual width," oval windows that could open, and a reserved smoking compartment.
By the end of the year, more than 200 automobiles have been registered with the city of Boulder.

February: Members of the Colorado State Penitentiary who had improved the Boulder Canyon road were treated to a noon dinner in the Boulderado's dining room.
March 16: Etta Mark gave birth to a son, William ("Bill"), who would grow up in the Boulderado.
April 6: The United States declared war on Germany and entered World War I. The Red Cross set up "work rooms" in the Hotel Boulderado where mothers, sisters, wives, and girlfriends could roll bandages and knit socks and sweaters for their men overseas.
September 11: Paving of Boulder streets began when the first concrete was poured near the corner of 18th and Pearl Streets.
November 7: Bolshevik Revolution began in Russia.
As more women became working or single mothers because of World War I, there was an increased need for day care in the community. To serve this need, the Women's Club of Boulder Civic Committee organized the Boulder Day Nursery Association.
Hugh Mark took over as manager of the Hotel Boulderado.