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North Jefferson Junior Baseball Association

9 to 14-Year-Old League

Cost: $400/player
(discounts for multiple children playing within NJJBA)

All 9, 10, 11, 12, 13 and 14-year-old league teams will play in the Rocky Mountain Junior Baseball League (RMJBL). 


The league is made up of 20 high school areas throughout Jefferson County and the Denver metro area. The league is divided into 4 levels at each age/division:

  • AAA - National
  • AAA - American
  • AA - National
  • AA - American
AAA - National league teams contain players of the highest skill level while AA - American league is designed for the new or inexperienced player.

By placing teams in 4 separate divisions, players will be competing against teams and other players of the same skill level. The league schedule consists of 14 regular season with an end of season tournament. Games are played during the week with 7 games at Arvada area fields and 7 games at away fields.

The season typically begins the first week of April and runs to the end of June.

Contact Us

North Jefferson Junior Baseball Association

6385 W 52nd Ave, 4
Arvada, Colorado 80002

Phone: 303-422-7406
Email: [email protected]

North Jefferson Junior Baseball Association

6385 W 52nd Ave, 4
Arvada, Colorado 80002

Phone: 303-422-7406
Email: [email protected]
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