Legal Delivery
Also known as: legal pitch, legal slow-pitch delivery
A legal delivery in slow-pitch softball is a pitch that is released underhand with a smooth, continuous motion and arrives within the required arc height — typically between 6 and 12 feet — over the plate.
Umpires judge a delivery on three factors: the release (must be underhand and from below the hip), the motion (one smooth, continuous forward swing — no snap or spin), and the arc (the ball must travel through the legal height window). Any pitch outside those parameters is called illegal, and the batter may take the pitch as a ball or swing at it. Pitchers who focus on consistent spin-free releases and repeatable arc control give their team more innings without free bases.
Example
The pitcher lobs the ball smoothly underhand; it rises to 9 feet and drops into the zone — the umpire signals a legal pitch.
Why it matters
Illegal pitches hand free bases and momentum to the opposition. SwingVantage can flag delivery-consistency faults so your pitcher repeats a legal motion every time.
Frequently asked questions
What is the legal arc in slow-pitch softball?
Most associations require the pitch to reach a minimum of 6 feet and a maximum of 12 feet above the ground at its highest point, though some leagues vary the window slightly.
Does a pitcher have to wind up in slow pitch?
No windup is required, but the delivery must be a single, continuous underhand motion without stopping or reversing.
Related terms
- ArcThe arc is the high, looping flight path a legal slow-pitch delivery must follow — typically a minimum of 6 feet and a maximum of 12 feet. Hitters time their swing to the ball’s descent.
- Illegal PitchAn illegal pitch is any delivery that violates the rules — most commonly a pitch outside the legal arc window, a spin-thrown ball, or a release from an illegal position.
- Arc Height RegulationArc height regulation defines the required minimum and maximum height a slow-pitch delivery must reach — typically 6 to 12 feet — to be called a legal pitch.
- Pitching RubberThe pitching rubber is the white rubber slab on the pitcher's mound from which the pitcher must begin and complete a legal delivery. Leaving or dragging off the rubber incorrectly results in an illegal pitch.
Related guides & benchmarks
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