The University of Delaware Fightin' Blue Hens football team played its home games at the park from 1940 until 1952. Delaware had played at Frazer Field in Newark before moving to Wilmington Park midway through the 1940 season. Delaware played its first game at Wilmington Park on November 9, 1940 and beat Pennsylvania Military College 14–7. While Delaware would continue to play occasional games at Frazer through the 1946 season, the team played its home games at Wilmington Park until midway through the 1952 season. In their last game at the ballpark, Delaware beat Pennsylvania Military College, 43–20. Delaware finished the 1952 season at the brand-new Delaware Stadium which returned the team to Newark and the university campus. During World War II, in January 1943, Major League Baseball CommissionerKenesaw Mountain Landis ordered most Major League clubs to hold spring training north of the Ohio and Potomac rivers to comply with government requests to help the war effort by eliminating nonessential travel. The Philadelphia Athletics held spring training at Wilmington Park in 1943 and the Philadelphia Phillies at the park in 1944 and 1945. In addition to World War II-spring training games at Wilmington Park, the Phillies played occasional exhibition games at the ballpark including games against the Blue Rocks. The Phillies and Athletics had long played pre-season exhibition games against each other in the Philadelphia City Series. The A's moved to Kansas City prior to the 1955 season but returned to the Philadelphia-area for a final match-up prior to 1955 Opening Day. They played the 1955 series at Wilmington where the A's beat the Phillies 9–6 on April 9, 1955 and 10–2 on April 10, 1955. The Philadelphia StarsNegro League baseball team hosted the Newark Eagles at the ballpark on Memorial Day in 1945.
Attendance
7,000 fans attended the Blue Rocks’ first game at the ballpark in 1940 and the club established a Class B attendance record in 1940 with 145,643 attending ballgames at Wilmington Park. The club topped that mark with 172,531 fans in 1944. The single game attendance record for the Blue Rocks was set in 1947 when 7,062 fans saw Curt Simmons’ Wilmington debut. But attendance in 1950 dropped to 38,678, and despite a slight improvement to 43,135 in 1951, attendance continued to sink in 1952 which proved to be the last for the Blue Rocks at the ballpark.