Beginning in 1975, Hmong refugees from Laos began arriving in the United States. They settled in locations across America, including Utah. Often, their sponsors were religious, and the Hmong would sometimes convert to the religion of their sponsors.
The Hmong who settled in Utah were exposed to Mormonism and many were converted to the religion in the early 80s. This group subsequently resettled in California, where they make up the backbone of the Mormon Hmong population there.