Rules

Leaving early, illegal pitches, DP/FLEX and re-entry, and how leagues differ.

• Guide

  Fastpitch Softball for New Parents: Rules Made Simple

  Fastpitch has a few rules you won't know from baseball. Runners can't leave the base until the pitch is released. The look-back rule makes them commit once the pitcher has the ball in the circle. The pitcher's motion has its own rules. And the DP/FLEX lets one player bat for another who only fields. Which rulebook applies depends on your daughter's league.

• Calculator

  Softball Rules by League: Little League, High School, USA

  The core rules match: runners leave on the pitcher's release, the look-back rule applies, and a leap is legal but a crow hop isn't. The differences are in the details. Little League requires every player to play and bat. High school and USA Softball use the DP/FLEX. USA Softball's run rule is 15, 12 or 8 runs, and its intentional walks still need four pitches.

• Rule

  Softball DP/FLEX Rule Explained (With Lineup Examples)

  The DP (designated player) bats but doesn't have to field. The FLEX fields but doesn't bat. They're linked, because the FLEX may only ever bat in the DP's spot. The lineup starts with 10 and drops to 9 when the FLEX bats for the DP or the DP fields for the FLEX. Each can re-enter once.

• Explainer

  USA Softball vs High School Softball Rules

  A player switching between travel ball and high school will notice a few differences. USA Softball needs four pitches for an intentional walk, while high school awards it without pitching. USA Softball's JO play allows an extra player, ends games on a 15, 12 or 8-run lead, and tournaments often play to a time limit. High school leaves the run rule to each state.

• Rule

  Softball Look-Back Rule vs. Leaving Early, Explained

  Two different rules. Leaving early: a runner can't leave her base until the pitcher releases the pitch, or she's out. The look-back rule: once the pitcher has the ball in the circle after a play, a runner who's off her base must go back or go on right away. She may stop once, but can't dance around.

• Rule

  Softball Re-Entry Rule: Who Can Come Back In?

  In high school (NFHS) and USA Softball, any player, starter or substitute, may leave the game and re-enter once, in the same spot in the batting order. A player who leaves a second time can't come back. Little League has its own re-entry rules tied to mandatory play.

• Rule

  Dropped Third Strike in Softball: When Can She Run?

  If the catcher doesn't catch strike three cleanly, the batter may run to first, unless first base is occupied with fewer than two outs. Then she's out anyway. High school fastpitch and Little League's Major Division both use the rule.

• Explainer

  Softball Field Dimensions by Age: Bases and Fences

  Fastpitch softball uses 60-foot bases at every youth level and in high school. Only the pitching distance grows: 35 feet at 10U, 40 at 12U, and 43 feet from 14U up, including high school. Fences run 175 to 225 feet at 10U and 200 to 225 feet from 12U through 18U in USA Softball; Little League uses 200 feet.

• Rule

  Softball Run Rule: High School, USA Softball, Little League

  USA Softball fastpitch ends a game when a team leads by 15 runs after 3 innings, 12 after 4, or 8 after 5. Little League uses 15 runs after 3 innings, 10 after 4, or 8 after 5 in the Major Division. High school games are 7 innings, and each state association sets its own run rule, so check yours.

• Explainer

  Slowpitch vs Fastpitch Softball: The Main Differences

  In fastpitch, the pitcher throws hard with a windmill motion from 43 feet, nine players field, and runners can steal. In slowpitch, the pitch is lobbed in an arc, ten players field, runners mostly can't steal, and adult fields are bigger: 70-foot bases and a 50-foot pitching distance. Youth and high school girls' softball is almost always fastpitch.

• Explainer

  2027 High School Softball Rule Changes (NFHS), Explained

  Four NFHS changes take effect for the 2027 high school season. Courtesy runners can run for the pitcher and catcher before they've faced a batter. Coaches can send one-way electronic signals to the pitcher. Any fair ball touched by a fielder is now a deflected ball. And states set umpire uniform standards.

• Explainer

  Fastpitch Softball Terms: A Glossary for Parents

  The fastpitch words parents hear most: the circle is the 8-foot ring around the pitcher, and the look-back rule makes runners commit once she has the ball in it. DP/FLEX lets one player bat for another who only fields. A slapper is a left-handed hitter who runs into the ball. Players can leave the game and come back once, under the re-entry rule.