Founding of Boulder, February 10, 1859

From the City of Boulder web site.

Gold seekers established the first non-native settlement in Boulder County on October 17, 1858 at Red Rocks near the entrance to Boulder Canyon. Less than a year later, on February 10, 1859, the Boulder City Town Company was organized by A.A. Brookfield, the first president, and 56 shareholders. Four thousand forty-four lots were laid out at a purchase price of $1,000 each, a price that was later lowered in order to attract more residents.

At this time, Boulder was apart of Nebraska Territory and remained so until February 28, 1861, when Colorado became a territory.