Pioneer Day, celebrated on July 24th, is a holiday in Utah commemorating the arrival of Brigham Young and the first group of Mormon pioneers into the Salt Lake Valley in 1847. It's a significant day for members of The Church of Jesus Christ of Latter-day Saints (LDS), also known as Mormons, and is also a state holiday in Utah. The day is celebrated with parades, rodeos, fireworks, and other festivities.