2027 bat rules for every baseball league, at a glance
One table: the stamps, drop limits and lengths allowed in every major youth, high school, college and adult baseball league for 2027. Last checked Oct 23, 2026.
Every row links back to the full rules page for that league, with sources and the date we checked. ⚠️ means the rule varies by state, event or league, so check your event.
| League | Division | Stamps allowed | Drop limit | Max length |
|---|---|---|---|---|
| Little League | Tee Ball | Tee ball, USABat, Wood | — | 33" |
| Little League | Minors & Majors (incl. coach and machine pitch) | USABat, Wood | — | 33" |
| Little League | Intermediate (50/70) | USABat, BBCOR, Wood | — | 34" |
| Little League | Junior League | USABat, BBCOR, Wood | — | 34" |
| Little League | Senior League | BBCOR, Wood | -3 or heavier | 36" |
| Babe Ruth & Cal Ripken | T-Ball | Tee ball | — | — |
| Babe Ruth & Cal Ripken | Cal Ripken (Rookie, Minor, Major 60/70) | USABat, Wood | — | — |
| Babe Ruth & Cal Ripken | Babe Ruth 13–16 | USABat, BBCOR, Wood | — | — |
| Babe Ruth & Cal Ripken | Babe Ruth 16–18 | BBCOR, Wood | -3 or heavier | — |
| PONY | Shetland, Pinto, Mustang, Bronco & Pony (6U–14U) | USABat, BBCOR, Wood | — | — |
| PONY | Colt (16U) & Palomino (19U) | BBCOR, Wood | -3 or heavier | 42" |
| PONY | Thorobred (23U) | Wood | — | 42" |
| Diamond Youth (Dixie) | T-Ball | Tee ball, USABat, Wood | — | 33" |
| Diamond Youth (Dixie) | 6U Coach Pitch through 12U Majors | USABat, BBCOR, Wood | — | 33" |
| Diamond Boys (Dixie) | Boys (13–14) & 15U | USABat, BBCOR, Wood | — | — |
| Diamond Boys (Dixie) | Pre-Majors & Majors | BBCOR, Wood | -3 or heavier | — |
| AABC | Clemente (8U) through Nolan Ryan (13U) | USABat, Wood | — | — |
| AABC | Sandy Koufax (14U) | BBCOR, Wood | -3 or heavier | — |
| AABC | Griffey (15U), Mantle (16U), Mattingly (17U), Connie Mack (18U) & Stan Musial | Wood | — | 42" |
| USSSA Baseball | 7U–12U | USSSA 1.15, USABat, BBCOR, Wood | — | — |
| USSSA Baseball ⚠️ varies | 13U | USSSA 1.15, BBCOR, Wood | -8 or heavier | — |
| USSSA Baseball ⚠️ varies | 14U | BBCOR, Wood | -3 or heavier | — |
| USSSA Baseball | 15U and up | BBCOR, Wood | -3 or heavier | — |
| Perfect Game | 6U–11U | USSSA 1.15, USABat, BBCOR, Wood | — | — |
| Perfect Game | 12U | USSSA 1.15, USABat, BBCOR, Wood | — | — |
| Perfect Game | 13U | USSSA 1.15, USABat, BBCOR, Wood | -5 or heavier | — |
| Perfect Game | 14U | BBCOR, Wood | -3 or heavier | — |
| Perfect Game ⚠️ varies | 15U–18U & showcases | BBCOR, Wood | -3 or heavier | — |
| Game Day USA | 8U–12U | USSSA 1.15, USABat, BBCOR, Wood | — | — |
| Game Day USA | 13U | USSSA 1.15, USABat, BBCOR, Wood | -8 or heavier | — |
| Game Day USA | 14U | USSSA 1.15, USABat, BBCOR, Wood | -5 or heavier | — |
| Game Day USA | 15U and up | BBCOR, Wood | -3 or heavier | — |
| AAU | 13U and younger | Any bat | — | — |
| AAU | 14U and older | BBCOR | -3 or heavier | — |
| High school (NFHS) | Varsity, JV & freshman | BBCOR, Wood | -3 or heavier | 36" |
| American Legion | Junior (17U) | BBCOR, Wood | -3 or heavier | 36" |
| American Legion | Senior (19U) | BBCOR, Wood | -3 or heavier | 36" |
| College | NCAA (all divisions) | BBCOR, Wood | -3 or heavier | 36" |
| College | Northwoods League (summer) | Wood | — | — |
| College | Cape Cod, Coastal Plain, Prospect & other summer leagues | Wood | — | — |
| Adult baseball ⚠️ varies | MSBL / MABL | Wood | — | — |
| Adult baseball ⚠️ varies | NABA | Wood | — | — |
What's new for 2027
- Diamond Youth (formerly Dixie Youth): tee ball bats are no longer allowed in 6U Coach Pitch or any pitched-ball division.
- USSSA 14U in Louisiana, Tennessee, Mississippi and Texas: BBCOR only (was -5).
- Little League, high school and NCAA: no bat changes for 2027. The big changes come in 2028 and 2029 (USA BBCOR explained).
See every league's details on the League Rules page.
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