[2][3] It commemorates the entry of Brigham Young and the first group of Mormon pioneers into the Salt Lake Valley on July 24, 1847,[4] where the Latter-day Saints settled after being forced from Nauvoo, Illinois,[5] and other locations in the eastern United States.

[13][14] While the holiday has strong links to the LDS Church, it is officially a celebration for everyone, regardless of faith and nationality, who immigrated to the Salt Lake Valley during the pioneer era, which is generally considered to have ended with the 1869 arrival of the transcontinental railroad.

[16] The Intertribal Powwow at Liberty Park in Salt Lake City honors the cultural heritage and contributions of the area's Native Americans, helping Utahns to gain a deeper understanding of the region's history.

[17][18] The earliest precursor to Pioneer Day celebrations in Utah occurred on July 24, 1849,[19] when the Nauvoo Brass Band led a commemoration of the second anniversary of the Latter-day Saints entering the Salt Lake Valley.

[22] The 1886 commemoration was particularly notable for its mourning theme, with the Salt Lake Tabernacle decorated in black instead of the usually colorful bunting, and the eulogizing of Latter-day Saints who were in hiding or imprisoned for polygamy offenses.