American Legion Junior (17U) bat rules (2027)
The rule for 2027
Bats must carry the BBCOR stamp, or be wood. Barrel 2 5/8" max. Length 36" max. Drop -3 or heavier.
Source: legion.org · checked Oct 23, 2026
| Stamp | BBCOR or Wood |
|---|---|
| Max barrel | 2 5/8" |
| Max length | 36" |
| Drop limit | -3 or heavier |
| Ages | 13–17 |
Non-wood: 36" and 2 5/8" max with the BBCOR mark on the barrel. Wood: 42" and 2 3/4" max. An illegal bat gets the player and manager ejected. Legion votes on rule changes in odd years, so watch the 2027 book.
What the stamps mean
- BBCOR .50 mark: The high school and college standard: -3 drop, barrel up to 2 5/8", 36" max. BBCOR bats made before USA BBCOR stay legal in high school indefinitely, but the NCAA requires the new USA BBCOR mark from Jan 1, 2029. Official list.
- one-piece solid wood: One-piece solid wood is legal almost everywhere without a stamp. Multi-piece, laminated, bamboo and composite-wood bats usually do need a certification mark.
What size bat for Junior (17U)?
Height and weight matter more than age. These are typical sizes for an average-size player, from the Rawlings/Easton sizing chart and CDC growth charts. For your player's exact size, use the Bat Finder for Junior (17U).
| Age | Typical length | BBCOR drop |
|---|---|---|
| 13 | 30"–31" | -3 |
| 14 | 31"–33" | -3 |
| 15 | 32"–33" | -3 |
| 16 | 32"–33" | -3 |
| 17 | 33" | -3 |
Shop bats for Junior (17U)
These links open bats with the right stamp. Check the exact model against the official list before you buy. We earn a commission if you buy, at no cost to you.
BBCOR bats
Playing college ball in 2029 or later? Those players will need the new USA BBCOR mark, which reaches stores July 1, 2027.
Other American Legion divisions
- Senior (19U) (Ages 15–19)
This page summarizes the published rule. Your league or tournament can add its own, and its ruling is final. Confirm your bat isn't on a decertified or non-approved list before you buy. More bat questions.
Not sure what to buy?
The free Bat Finder gives you the length, the drop and the stamp your league requires in about 20 seconds.
Open the Bat Finder