Further revisions were made by the legislature on February 28, 1929, to specify the exact colors used and on March 31, 1964, to specify the size and positioning of the letter "C" and gold disk.

[1] The origin of the modern flag of Colorado can be traced to a meeting of the Denver chapter[8] of the Daughters of the American Revolution (DAR) held on November 14, 1910.

Then-state senator William H. Sharpley assisted in getting the flag bill through the legislature with relative ease, though the design ultimately proved unpopular.

To resolve this, on March 31, 1964, the legislature further dictated the diameter of the gold disc to be equal to the width of the center stripe.

[10] Other symbolism apart from the senate bill has been noted, including the red coloring of the "C" standing for the "ruddy" earth that covers much of the state's terrain.

Legislation passed in 1964 specified that the diameter of the yellow disc should be equal to that of the white stripe, while the red letter "C" occupies two-thirds of the width of the entire flag.

[13] The state of Colorado and the office of the governor have laid out rules as to when the flag can be flown at half-staff and protocol for various other situations.

The governor may order the flag lowered to half-staff, along with the national flag, on the day of the funeral of a Colorado service member, at the request of the president (usually for the death of a federal government official or a national tragedy), or on the day of the funeral of a state government official.

[18] The Colorado Rapids, who compete in Major League Soccer and play in the Denver area, played in an alternate kit for part of the 2017 season with colors inspired by the state flag: the top was yellow with blue accents, and the shorts were blue with yellow accents.

[20] The flag enjoyed renewed popularity during the 2010s, with shirts, decals, and other items incorporating the design seeing increased demand.