Why does first base have two colours in softball?
A · Advanced · Pitching and base running · 3 of 6It is a double base, built to stop collisions. One half sits in fair territory and the fielder uses it. The other half, in a contrasting colour, sits in foul territory and the batter runs to it when there is a play at first. After running through, the player uses the fair half only.
How it works
- Two halves: one fixed in fair territory and one "a different solid contrasting color" in foul territory.
- Every WBSC competition: the double base is used at all of them.
- The fielder: uses only the fair half.
- The batter-runner: when a play is being made at first, must touch the foul half.
- Touching only the fair half: treated as missing the base. The batter-runner is out if the defence appeals before they get back to it.
- Fair or foul: a batted ball that hits the fair half is fair. One that hits only the foul half is foul.
- Throws from the foul side: if the play comes from foul ground near first, fielder and runner may each use either half.
- No play at first: on a hit to the outfield the batter-runner may touch either half.
- Afterwards: a runner who has overrun the base returns to the fair half.
- As a runner: tagging up and returning on a pickoff are done on the fair half.
- A collision: a batter-runner who touches only the fair half and runs into the fielder taking the throw there is out.
The glossary has the base, the batter-runner, the fair ball, the foul ball, the force out and the appeal play.
Tricky cases
The batter-runner beats a close throw but steps only on the fair half. Safe?
Safe unless the defence appeals. If it appeals before the batter-runner returns to the fair half, the batter-runner is out.
On a clean single to centre field, the batter rounds first touching the fair half. Any problem?
None. With no play being made at first, the batter-runner may touch either half.
The catcher picks up a dropped third strike in foul ground and throws to first from there. Which half does the fielder use?
Either. On a play made from foul territory by first base, the fielder and the batter-runner may use either half.
A runner on first tags up on a fly ball standing on the coloured half. Is that correct?
No. When tagging up, the fair half must be used.
Why the rule exists
First base is the one base runners cross at full speed, and the fielder is standing on it with eyes on the throw. Two players aiming at the same small bag means ankles and knees get hurt. Giving each a half of their own removes most of that contact.
Where it differs
| Where | What changes | Source |
|---|---|---|
| Play at first on a batted ball | Batter-runner uses the foul half, fielder the fair half | WBSC Softball Rule 5.6 a |
| Play from foul territory | Either half for both | WBSC Softball Rule 5.6 a ii |
| Once on base | Fair half only | WBSC Softball Rule 5.6 b |
| Baseball | A single base | WBSC Baseball Rule 2 |
From the rule book
World Baseball Softball Confederation, Official Rules of Softball: Fast Pitch (2026-2029), Rules 5.5.2 a vi, 5.5.2 b xiii and 5.6, and Appendix 1, F. WBSC, Softball World Cups Tournament Regulations (revised 3 March 2026), C7.3. Checked 14 October 2026. Official document: WBSC Official Rules of Softball, Fast Pitch, 2026-2029 (PDF).