Softball Rules: The Complete Guide
Everything coaches, parents, and players need to know about softball. Pitching rules, base running, the DP/Flex system, dropped third strike, and run rules at every level.
Softball moves fast. The pitching distance is shorter, the bases are closer, and the game packs a lot of action into 7 innings. But if you're new to the sport, some of the rules can be confusing. What's the deal with the dropped third strike? When does the infield fly rule apply? What on earth is a DP/Flex? This guide answers all of it.
We'll walk through the basics of how softball works, break down the pitching rules, explain base running (including the no-lead-off rule), cover the DP/Flex system, and go through every run rule and special situation you'll encounter. We'll also cover how rules change from youth leagues up through college.
For a breakdown of where each player goes on the field, check out our softball positions guide. And for field layout details, see our softball field dimensions page.
How Softball Works
The basics of the game for anyone new to the sport.
Softball is played between two teams on a diamond-shaped field. One team bats while the other plays defense. The batting team tries to score runs by hitting the ball and advancing around four bases (first, second, third, and home plate). The defensive team tries to record three outs to end the batting team's turn. Once both teams have batted, that's one complete inning.
The game looks a lot like baseball, but there are critical differences that change strategy and gameplay.
Key Differences from Baseball
- Pitching: Underhand windmill delivery from a flat circle (no raised mound)
- Ball size: 12-inch ball (11-inch for 10U), vs 9-inch baseball
- Base distance: 60 feet between bases at all levels (vs 90 feet in baseball)
- Pitching distance: 35 to 43 feet depending on level (vs 60'6" in baseball)
- No leading off: Runners must stay on the base until the pitch is released
- Game length: 7 innings standard (vs 9 in baseball)
- DP/Flex: More flexible than baseball's DH rule
Game Structure by Level
Innings, pitching distance, and field dimensions at every age group.
Softball adapts its rules by age group to keep the game developmentally appropriate. Here's how the core structure changes from youth through college.
| Level | Innings | Pitching Distance | Base Distance |
|---|---|---|---|
| College (NCAA) | 7 innings | 43 feet | 60 feet |
| High School (NFHS) | 7 innings | 43 feet | 60 feet |
| 14U | 7 innings | 43 feet | 60 feet |
| 12U | 6 innings | 40 feet | 60 feet |
| 10U | 5 to 6 innings | 35 feet | 60 feet |
| 8U | 4 to 5 innings | 35 feet (or coach pitch) | 60 feet |
For detailed field layout information including outfield fence distances, backstop placement, and dugout positioning, see our softball field dimensions guide.
Pitching Rules
The underhand windmill delivery and what's legal from the circle.
Pitching is the defining difference between softball and baseball. In softball, every pitch must be delivered underhand. The windmill motion generates the speed and movement that makes elite softball pitching so difficult to hit.
The Windmill Delivery
The pitcher starts with both feet on the pitching rubber (or plate). The arm swings in a full circle (the windmill motion) and releases the ball below the hip in an underhand motion. The delivery can generate surprising velocity: top college pitchers throw 65-70+ mph from 43 feet, which gives the batter a similar reaction time to an 85-90 mph baseball pitch from 60 feet, 6 inches.
Legal vs Illegal Pitches
Common illegal pitching calls include: the crow hop (replanting the push-off foot to gain extra momentum), leaping (both feet leaving the ground during delivery), and quick pitch (delivering before the batter is ready). An illegal pitch results in a ball being called. If there are runners on base, they advance one base.
The Pitching Circle
The pitching circle is an 8-foot radius circle centered on the pitching rubber. When the pitcher has the ball inside the circle, runners must immediately commit to advancing to the next base or return to their current base. If a runner is caught off base while the pitcher has the ball in the circle, the runner is out. This is called the "look back" rule and it's specific to softball.
Base Running Rules
No leading off, stealing, and the look-back rule.
Base running in softball has several rules that don't exist in baseball. The most important one is simple: you cannot leave the base until the pitch leaves the pitcher's hand.
No Leading Off
Runners must maintain contact with the base until the ball is released from the pitcher's hand. If a runner leaves early, the umpire calls the runner out. This rule applies at all levels of fastpitch softball.
Stealing
Stealing is allowed once the pitch is released. Runners can steal on a passed ball, wild pitch, or any live ball situation. At younger levels (8U and some 10U leagues), stealing may be restricted or not allowed at all.
The Look-Back Rule
Once the pitcher has the ball in the pitching circle, runners must immediately commit: advance to the next base or return to the base they were on. Stopping, hesitating, or dancing between bases results in the runner being called out.
Running Lanes
When running to first base, the batter-runner must use the running lane (the last half of the distance from home to first, marked by a line in foul territory). If the runner is outside the lane and interferes with the throw to first, they're out.
Tagging Up
On a fly ball that's caught, runners must tag up (touch their base after the catch) before advancing. If a runner leaves the base before the catch and the defense throws to that base, the runner is out. This works the same as baseball. Runners can advance at their own risk after tagging up.
The DP/Flex Rule
Softball's unique lineup flexibility, explained clearly.
The DP/Flex rule is one of the most misunderstood rules in softball. It's more flexible than baseball's designated hitter, and coaches who understand it gain a real strategic advantage.
What Is the DP?
The DP (Designated Player) is listed in the batting order and bats every time their spot comes up. They do not have to play a defensive position. Think of them as a hitter who doesn't field. The DP is listed as the 10th player in the lineup.
What Is the Flex?
The Flex is the defensive player whose batting spot is taken by the DP. The Flex plays defense but does not bat. They're essentially the opposite of the DP: they field but don't hit.
What Makes It Flexible
Here's where it gets interesting:
- The DP can enter the game on defense for the Flex at any time
- The DP can play defense for any player, not just the Flex
- The Flex can enter the game as a batter, but only in the DP's batting position
- If the DP plays defense for the Flex, there are only 9 players in the game
- A team can start with either 9 batters (no DP/Flex) or 10 batters (with DP/Flex)
When to Use DP/Flex
Most coaches use the DP/Flex when they have a strong hitter who isn't a great fielder, or a great defensive player who struggles at the plate. It lets you keep both players in the game, each doing what they do best. At the youth level, some leagues don't use the DP/Flex, so check your league rules.
Special Rules
Dropped third strike, infield fly rule, and run rules.
These are the rules that cause the most confusion at games. Know them and you'll never have to wonder what just happened.
Dropped Third Strike
When the catcher fails to catch the third strike cleanly (the ball hits the dirt, bounces, or is dropped), the batter is not automatically out. The batter can run to first base, and the catcher must throw them out.
But there's a catch: This only applies when first base is unoccupied, OR when there are two outs. If there are fewer than two outs and a runner is on first base, the batter is automatically out on the third strike regardless of whether the catcher catches it. This prevents the defense from intentionally dropping the pitch to set up a double play.
Infield Fly Rule
This rule applies when: runners are on first and second (or bases loaded), there are fewer than two outs, and a fair fly ball is hit that an infielder could catch with normal effort.
The umpire calls "Infield fly, batter is out!" The batter is out whether the ball is caught or not. Runners can advance at their own risk. This rule exists to prevent fielders from intentionally dropping the ball to create easy force plays at multiple bases.
Run Rules (Mercy Rules)
Run rules end the game early when one team has an insurmountable lead. The exact thresholds vary by league and level, but here are common examples:
| After Inning | Lead Required |
|---|---|
| After 3 innings | 12 or more runs |
| After 4 innings | 10 or more runs |
| After 5 innings | 8 or more runs |
These numbers vary. Some youth leagues use a 15-run rule after 3 innings and a 10-run rule after 5. Always check your league's specific thresholds.
Batting Rules
The batting order, substitutions, and lineup management.
Softball batting rules are straightforward but have a few specifics that differ from baseball.
Batting Order
The batting order is set before the game and stays the same throughout. You can't change the order. Teams bat either 9 or 10 batters (10 if using the DP/Flex). Some youth leagues bat the entire roster regardless of who plays defense.
Substitutions
A starting player who is substituted out can re-enter the game once, but must return to the same spot in the batting order. Substitutes who enter the game cannot re-enter after being removed. The DP/Flex has special substitution rules (see above).
Batter's Box
The batter must have both feet inside the batter's box when the pitch is delivered. Stepping on home plate while swinging is an automatic out. The batter's box in softball is 3 feet wide and 7 feet long.
Bunting
Bunting is legal in softball at most levels. Some youth leagues restrict or ban bunting. A bunt that goes foul on a two-strike count is a strikeout (same as baseball). Slap hitting (a running slap from the left side) is a key offensive strategy, especially at higher levels.
Youth Softball Rules
How the game adapts for younger players.
Youth softball makes modifications to keep the game fun, safe, and developmentally appropriate. Rules vary by organization (USA Softball, ASA, Little League, USSSA), so always check with your specific league. Here are the most common adjustments.
8U: Coach Pitch or Machine Pitch
At the youngest levels, a coach or pitching machine delivers the ball instead of a player. Strikeouts may be limited or eliminated. Some leagues give each batter a set number of pitches (5 or 6) to put the ball in play. Stealing and bunting are typically not allowed.
10U: Player Pitch with Training Wheels
Players start pitching from 35 feet. Some leagues allow a walk limit per inning (after a set number of walks, the coach finishes the at-bat). Stealing may be limited to one base per pitch. The dropped third strike rule may not apply. Run limits per inning (typically 5 runs) keep games from getting out of hand.
12U: Getting Closer to Full Rules
Pitching distance moves to 40 feet. Most standard rules apply including stealing, dropped third strike, and the infield fly rule. Games are 6 innings. This is the level where the 12-inch ball replaces the 11-inch ball.
Bat the Roster
Many youth leagues use "bat the roster" or continuous batting order, where every player on the team bats regardless of whether they're playing defense. This keeps everyone involved and avoids the awkward conversation about who sits on the bench.
Getting Your Team Ready
You know the rules. Here's what comes next.
Now that you understand softball rules, here's a quick checklist to get your team ready for the season.
1. Get Your League's Rulebook
This guide covers the universal rules, but every league has its own tweaks. Know the specific run rules, pitch count limits (if any), and substitution policies for your league before the first game.
2. Learn the Positions
Knowing where each player goes on the field and what they're responsible for is half the battle. Our softball positions guide breaks down every position from pitcher to right fielder.
3. Order Uniforms
Custom softball uniforms get your team looking and feeling ready from day one. Secondslide makes full sublimation jerseys with your team's design. Need just jerseys? Check out our softball jerseys page for options.
4. Know the Field
Whether you're a coach laying out a field or a parent trying to understand the dimensions, our softball field dimensions guide has every measurement you need by age group.
Softball Gear from Secondslide
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Softball Jerseys
Custom softball jerseys in any style. Button-down, pullover, and two-button options.
Softball Positions Guide
Every softball position explained. Responsibilities, skills needed, and where they play on the field.
Softball Field Dimensions
Pitching distances, base paths, and outfield fences for every age group and level.
Frequently Asked Questions
What are the basic rules of softball?
Softball is played between two teams of 9 (or 10) players on a diamond-shaped field. The pitcher throws underhand from a flat circle, and the batter tries to hit the ball and reach base safely. Three outs end a half-inning, and both teams bat once per inning. Games are 7 innings for high school and college, and 5 to 6 innings for youth. The team with the most runs at the end wins. Key differences from baseball: underhand pitching, a larger ball (11 or 12 inches), shorter base paths (60 feet), and no leading off bases.
What is the dropped third strike rule in softball?
If the catcher fails to cleanly catch the third strike, the batter can attempt to run to first base. However, this only applies when first base is unoccupied, OR when there are two outs (in which case first base can be occupied). If the catcher drops the third strike with less than two outs and a runner on first, the batter is automatically out. This rule prevents the defense from intentionally dropping a third strike to start a double play.
What is the DP/Flex rule in softball?
The DP (Designated Player) and Flex are two roles unique to softball. The DP bats in the lineup but doesn't have to play defense. The Flex plays defense but doesn't bat (the DP bats in their spot). The DP can play defense for the Flex at any time. They can also play defense for any other position. The Flex can enter the game as a batter but only in the DP's batting spot. It's more flexible than baseball's DH rule and gives coaches more strategic options.
Can you lead off in softball?
No. In softball, base runners must stay in contact with the base until the pitch is released from the pitcher's hand. This is a major difference from baseball, where runners can take leads and steal bases before the pitch. In softball, stealing is allowed, but the runner can only leave the base after the pitch leaves the pitcher's hand. Leaving early results in the runner being called out.
What is the infield fly rule in softball?
The infield fly rule is called when there are runners on first and second (or bases loaded) with less than two outs, and a fair fly ball is hit that an infielder can catch with ordinary effort. The batter is automatically out, whether the ball is caught or not. This rule prevents the defense from intentionally dropping the ball to turn a double or triple play on runners who would otherwise hold their bases on a fly ball.
How many innings are in a softball game?
A regulation softball game is 7 innings for high school (NFHS) and college (NCAA). Youth games are shorter: typically 6 innings for 12U and 5 innings for 10U and younger. Games can end early due to run rules (mercy rules): a common format is the game ending if one team leads by 12 or more after 3 innings, 10 or more after 4, or 8 or more after 5. Extra innings are played if the game is tied after regulation.
What size ball is used in softball?
Softball uses two ball sizes depending on age. Players 10U and under typically use an 11-inch ball. Players 12U and older use a 12-inch ball. The ball is optic yellow in color at all competitive levels. For comparison, a baseball is about 9 inches in circumference. The larger softball, combined with the shorter pitching distance, gives batters less reaction time than you might expect.
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