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BBCOR / high school (NFHS) bat rules

Brief guide for parents whose player is aging into high school ball (including Illinois IHSA, which uses NFHS rules).

Non-wood batsBBCOR .50

Drop weight−3 only

USA youth / USSSANot for HS varsity

Starting 2028USA BBCOR + USABat −4/−5/−6 added

Current NFHS rule (through 2027 seasons)

Non-wood bats must meet the BBCOR performance standard.
Permanent rectangular certification mark on the barrel reading BBCOR .50 (stickers/decals not accepted).
Max barrel 2⅝″, max length 36″, and the bat may not weigh more than 3 oz less than its length (−3).

What’s changing in 2028

NFHS adopted USA Baseball’s oversight of BBCOR and will also allow USA BBCOR and USABat −4 / −5 / −6 beginning with the 2028 season. Existing BBCOR .50 bats remain legal indefinitely. This does not change 2026–2027 high school play.

Source: USA Baseball news (July 8, 2026) · NFHS rule change notes

Barrel size by age Published limits

Maximum barrel diameter (inches) commonly published for this program. Length and drop limits are separate — check the notes.

Age / division	Max barrel	Notes
High school varsity / JV (non-wood)	2⅝″ max	BBCOR .50 permanent mark; length ≤ 36″; −3 drop (through 2027)
Single-piece wood	2¾″ max	NFHS wood rule; length ≤ 36″
2028 and beyond (planned)	2⅝″ class	USA BBCOR + USABat −4/−5/−6 added; existing BBCOR .50 remains legal

NFHS Rule 1-3-2: non-wood bats ≤ 2⅝″ at thickest part. Illinois IHSA and most state associations follow NFHS.

Reference: NFHS Baseball Rules

Rules change. Always confirm with your league or event director before game day.

Page reviewed: October 22, 2026