The Big 4 Rodeos Association, which was established in
1948, celebrated its 75th anniversary in 2023 paying out over $1,600,000. It remains one of the oldest associations of its type in professional rodeo today and is comprised of
four rodeos (in order of occurrence), the Horse Heaven Round Up Rodeo,
Walla Walla Fair & Frontier Days, the Lewiston Roundup and the
Pendleton Round-Up.