Depending upon which organization your team is playing fastpitch softball is playing under, you will probably by using the rules of the one of the following national softball associations (as may be modified by the organization). If your team plays any “travel ball” tournaments, each tournament will most likely be playing by one of the following associations rules and you will be attempting to qualify for their national championship tournament.
Amateur Softball Association (ASA) was founded in 1933 and is the National Governing Body of softball in the USA. You can check out ASA by clicking HERE. You can download the rules app by clicking HERE. One problem I have with ASA is that they do not post their rules for free, they will not sell their Official Rules book (you get it as part of a team or umpire registration), and you can purchase the rules app for iPhone or Android for about $14.95.
ASA is the oldest of the main national softball associations and set the standards for the game of softball. However, ASA later became to be viewed by some to be too controlling of teams, players and revenues and by some to have rules that were overly complex or in need of changes, which led to the start of several other national softball associations.
National Softball Association (NSA) was founded in Lexington, Kentucky in 1982. The stated mission of the founder was to give more control to teams and players and to do that better than any other organization. You can check out ASA by clicking HERE. You can download the official Fastpitch rulebook by clicking HERE.
Independent Softball Association (ISA) was founded in Shelbyville, Tennessee in 1984 and was designed to make softball more fun and enjoyable by adopting innovative rule changes and placing teams first. You can check out ISA by clicking HERE. You can download the official rulebook by clicking HERE.
United States Fastpitch Association (USFA) was founded in 1998 in Panama City, Florida and was designed to cater specifically to the game of girl’s fastpitch softball. You can check out USFA by clicking HERE. You can download the official rulebook by clicking HERE.
United States Specialty Sports Association (USSSA) was founded in 1968 in Petersburg, Virginia and was known as the United States Slow-pitch Softball Association. However, in 1998 USSSA expanded into other sports and changed its name to United States Specialty Sports Association. USSSA was formed to provide a change in the current national association’s rules. You can check out USSSA FastPitch by clicking HERE. You can download the official fastpitch rulebook by clicking HERE.