The Caldwell Night Rodeo was organized in 1935 as part of the festivities to commemorate the 25th anniversary of the beginning of irrigation on the Boise project. It was called the Homesteaders’ Silver Jubilee and Night Rodeo. Lights were installed on the grounds and the first night rodeo to be held in southern Idaho was witnessed by thousands of people. Stock was provided by Everett Colborn and Doc Sorenson and $2,500 was put up in prize money. Kid Combs of Caldwell, a professional bronc buster, was the first cowboy to file his name on the entry list for the rodeo.