The Arizona Summer League (ASL) was a professional short-season instructional baseball league affiliated with the independent North American League (NAL). The league was announced on April 3, 2009, and founded in Yuma, Arizona by the now-defunct Golden Baseball League (now a part of the NAL). Now headquartered in San Ramon, California, it is an independent baseball league that includes of four teams based out of different cities. All games are played at Desert Sun Stadium in Yuma, Arizona. The 2011 season ran from July 13 to August 8.