Established in 1992 by Major League Baseball, the Arizona Fall League (AFL) was created to provide top prospects with additional development in a highly competitive environment. Operating during the autumn months, the AFL quickly earned a reputation as a proving ground for future MLB stars. With six teams based in the Phoenix area—each composed of prospects from multiple MLB organizations—the league offers a unique blend of talent, coaching, and competition.
The origins of the AFL stem from MLB’s desire to create a controlled, high-level off-season league where the game’s top prospects could refine their skills without going overseas or joining independent winter leagues. Arizona, with its mild fall climate and abundance of spring training facilities, was an ideal location. The league’s centralized setup allows for easy scouting and consistent competition, attracting talent evaluators and front office personnel from across the league.
Over the decades, the AFL has produced an impressive list of alumni, many of whom have gone on to become MLB superstars. Notable graduates include Derek Jeter, Mike Trout, Bryce Harper, Ronald Acuña Jr., and Mookie Betts. The league has become synonymous with the next wave of major league talent, often giving fans a sneak preview of players on the verge of breaking into The Show.
Beyond individual development, the AFL has had a broader impact on baseball. It has become a testing ground for new rules and technologies, including pitch clocks, automated strike zones, and changes in base size—many of which have later been implemented at higher levels. This experimental flexibility has made the AFL a valuable tool in MLB’s efforts to modernize the game while keeping its traditions intact.
The league also plays a critical role in injury rehabilitation and evaluation. Players returning from surgery or a lost season due to injury often use the AFL to log competitive innings or at-bats, providing both players and organizations with insight into readiness and recovery.
In its 30+ year history, the Arizona Fall League has grown from a niche developmental program into an essential part of MLB’s player development pipeline. Its blend of elite talent, innovation, and accessibility makes it one of the most respected off-season leagues in professional sports. For fans, scouts, and front offices alike, the AFL is more than a fall distraction—it’s a glimpse into baseball’s future.