The WIAA began sponsoring a tournament program in spring baseball in 1948.
The first State Tournament was held in Milwaukee, and a Milwaukee school (then called Boys Tech) was the winner, defeating Madison East, 10-2, in the finals.
Milwaukee was the site of the State Tournament again in 1949, but it was moved in 1950 to Menasha where it was held eight straight years through 1957. Eau Claire became the new home of the State Tournament in1958 and for the next four years as well, then it moved to Oshkosh for 1963 and 1964 and to Wisconsin Rapids in 1965 before returning to Eau Claire for five straight years. Marion held the 1971 and 1972 tournaments, then it moved to Wausau (1973) where it was held through 1997. The tournament moved to its current location at Time Warner Field at Fox Cities Stadium in Grand Chute in 1998.
Beginning in 1978, competition took place in three Classes (A-B-C). Terminology was changed in 1991 from Classes to Divisions (1-2-3). In 2006, the Tournament Series expanded to four divisions.
Appleton West has won seven titles to lead all member schools in championships won. Sun Prairie is next with six championships. Next on that list is Catholic Central and Nekoosa with five. Eau Claire has four State titles, and Hortonville, Janesville Craig, Marathon, Oconomowoc, Eau Claire Memorial, Kenosha St. Joseph, Ripon and Stevens Point have three titles each.
La Crosse Central leads in tournament appearances with 18. Milwaukee Bradley Tech has been to the State Tournament 15 times; Appleton West 14 times; Stevens Point 13 times; Eau Claire Memorial, Oconomowoc and Fond du Lac 12 times; Janesville Craig and Middleton 11 times; Eau Claire North and Sun Prairie 10 times; and Bay Port, Nekoosa and Watertown nine times. De Soto, Madison Memorial, Neenah, Hortonville, Superior and Wausau West have made eight appearances.
Only Nekoosa has won three consecutive championships. It won the Class B titles from 1980-82. Back-to-back championships have been accomplished 15 times, including Nekoosa's consecutive titles. Nekoosa also won two straight Class B championships in 1984-85. De Soto won two straight Division 3 titles in 2000-01, as did Catholic Central in 2004-05 and 2010-11. Hortonville won two consecutive Division 2 championships in 1997-98, Milwaukee Lutheran accomplished the feat in 2002-03, and St. Joseph's titles were won in two different divisions, winning the Division 2 title in 2005 and the Division 3 title in 2006.
Janesville Craig (1983-84) and Oconomowoc (1980-81) each won back-to-back Class A championships, and Eau Claire won two straight titles twice (1957-58 and 1961-62) before the class system was implemented. Appleton West also won a pair of consecutive championships (1975-76). Sun Prairie won back-to-back Division 1 titles in 2005-06 and Bay Port matched that accomplishment in 2009-10.