Twi Nite Leagues are divided as follows:
| League | Grades |
| Single A | 4K & 5K (coed) |
| Double A | 1st & 2nd (girls and coed) |
| Hardball Minors | 3rd & 4th (boys) |
| Hardball Majors | 5th & 6th (boys) |
| Hardball Seniors | 7th & 8th (boys) |
| Softball Minors | 3rd and 4th (girls) |
| Softball Majors | 5th and 6th (girls) |
| Softball Seniors | 7th and 8th (girls) |