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Get Mountainside team gear now through March 31st! 

From hoodies to tees for players and fans alike.  Name and numbering options are available!  Time is limited to get orders placed, so don't delay. Our partner Bashor's will fulfill the orders once the ordering period has closed. Orders will be shipped directly to you. 

Click here to order:


Enter Promo Mavericks97007-24 at checkout for 20% off of your order and a 20% donation to MSJBO!

Hi Mavs!

We're excited to announce that we're partnering with Baseballism on a fundraising opportunity! Proceeds will go towards providing equipment to our teams and help us keep cost burdens off of our families. Gear up for yourself or as a gift for someone else!

Enter Promo Mavericks97007-24 at checkout for 20% off of your order and a 20% donation to MSJBO!

*Discount Code Active: 2/15- 3/10/2024*

Spring Baseball Evaluations 2.17!


Player evaluation details below! Participation is mandatory. If you cannot attend this session, we have a make-up session on 2/20 at Cedar Hills Park. Please let us know ASAP if your player will attend the make-up session or if you will not be able to attend either session.



Location:  Mountainside High School Baseball Field

12500 SW 175th Ave

Beaverton, OR 97007

Time: Saturday, 2/17, Time has been assigned via email.


MAKE-UP Location: Cedar Hills Park Baseball Field

2300 SW Cedar Hills Blvd

Beaverton, OR 97005

Time: Tuesday, 2/20, 7:30-9:30 PM


Check in: Please arrive 30 minutes early, but no more than 45 minutes prior to the designated time slot.

  • Parents and players are to arrive at the designated drop off and proceed to the Registration table for check in.
  • We will be taking UNIFORM & CAP sizing, with samples of all available sizes on hand for try-on.  
  • Parents will not be allowed to be on the field during tryouts, but will be allowed to stay outside the field (even along the field fence) for viewing.
  • Once checked in, a Mountainside JBO representative will guide the players to an area of the field to begin stretching and warm-ups. 


** Please be on time, as we will need adequate time to get them registered, try on this year's uniform samples for sizing and allow for proper warm-up prior to the start of evals.  


What to Bring: Baseball glove, baseball bat, batting helmet and cleats, turf baseball shoes (no metal spikes allowed on the Mountainside turf!)-- remember, it is your job to come prepared! 


What to Wear:  Neutral clothing is required. Long sleeve shirt. Players cannot wear clothing that identifies them by name, number, or previous team. Be prepared for inclement, cold and rainy weather and dress appropriately.



  • Players need to come prepared for inclement weather-- by bringing sweatshirts, jackets, and to dress appropriately-- as the forecast calls for a chance of rain and/or cold temperatures.
  • Parents and family members will not be allowed access to the turf baseball field- only Mountainside JBO representatives, Mountainside High School coaches and players who are assisting with evals, and youth players asked to assist.
  • After evaluations are completed, player pickup will be in the parking lot area of Mountainside High School, near the athletic fields.
  • Participation is mandatory to be considered for the Federal and American teams. No exceptions except extraordinary ones. For a player who evaluated at the Senior level prior and made a team, we may go off that previous evaluation.  

Skills Evaluated:

  • Infield Fielding- using solid mechanics to field ground balls and then make accurate, strong throws to a specified base
  • Outfield Fielding- using good fundamentals and athleticism to pursue and catch fly balls, then making quality throws back into the infield to a specified base;
  • Hitting- (USSSA Bat) using solid hitting mechanics to consistently make contact with pitched balls; show power in the swing and hits
  • Baseball Speed- each player will run 2 reps of 90' dash, the same as baseball at the Senior level and beyond.  This will show how successful they may be at this level, both in terms of successfully being safe on hits, as well as stealing bases.
  • Given sufficient time, we may evaluate other key baseball skills, including pitching, catching, etc.


These evaluations will determine what level our Senior players will play at for the 2023 Spring season. More Info about JBO skill levels here.


Remember, evaluations are to take place, RAIN or SHINE. Best of luck and Mav Up!



Additional Baseball Workout Opportunities!

Hello Mavs!

We're in the home stretch leading up to Baseball Evaluations at Mountainside HS on the 17th of this month (make-ups on 2.20)! Thanks to those that participated in winter workouts. Many of you have expressed interest in additional workout opportunities leading up to evals.  We were able to schedule more time at both D-Bat (Wednesdays 6-7:30pm) and Bat Zone (Sundays 5-7pm minus SuperBowl Sunday) through the end of February. As this is short notice, we'll have to simply pay $50 via check or Venmo (details below). 

To sign up, simply email that you will be participating and submit your $50 payment via Venmo or check at your 1st session. Please let us know if you have any questions! 



Cost: $50


Sundays 5-7pm (Feb 4,18,25) @ Bat Zone

Wednesdays 6-7:30pm (Feb 7,14,21,28) @ D-Bat

Important Upcoming Dates

1/31: Registration Deadline

2/17: Evaluation Day @ Mountainside HS

2/20: Evaluation Make-Up (if needed)

4/26-28: Mountainside Stampede Tournament

MSJBO Winter Workouts

Great news! We're offering winter skills workouts to sharpen player's tools ahead of the spring 2024 JBO season. 


Cost: $150 

Duration: Twice weekly sessions through January

When: Sundays 6-8pm @Batzone, 

                Tuesdays 6-7:30 @D-Bat

Who: Players grades 3-8

Where: Sessions split between Batzone and D-Bat

Registration is open now! 



Spring Baseball Registration Is Now OPEN!


Great news! 2024 JBO Spring registration is now open! Register now through January 31st.

Player evaluation dates for all age and skill levels will be announced soon.

Games schedules should be announced by April 15th.  With regular season league games starting in the last week of April.   

Please note that registration comes with the commitment to be available for some tournaments as decided by the team coach! These are TBD and may vary by level.

JBO Levels
Minors: 3-4th Grade
Juniors: 5-6th Grade
Seniors: 7-8th Grade

Cost: $550

1 game jersey, hat are included in the registration fees.

Registration fees are fully refundable if we are unable to place a player with a team or we are unable to field a particular team due to lower than expected player numbers.

Players may be eligible for financial assistance via THPRD. Simply submit your application!

Band of Baseball Brothers



Learn more about playing a better brand of baseball!

MavUp Development Clinics

Winter Baseball Workouts

Championship Baseball

2021 & 2022 were banner years for Mountainside JBO!

In an unprecedented run for JBO baseball, ALL of our Mountainside JBO teams over the course of these two seasons have won their district divisions, with 6 teams going on to win outright district championships, and with all qualifying for their respective State Championship Tournaments.   

When the dust settled on the 2021 and 2022 seasons, Mountainside JBO  brought home 3 State Championships!

In the annals of JBO history, one of the greatest runs ever for a JBO program!

Such a great showing is a testament to the quality of the players, coaches, and volunteers that are part of the Mountainside JBO program!  

Come be part of our Championship program, while playing an advanced,  high quality brand of baseball-- with your classmates and friends.

About Mountainside JBO

Mountainside Junior Baseball Organization (JBO) is a 501(c)(3) non-profit organization that was established in 2017 to compete as an affiliate in Oregon's Westside JBO district, while offering a youth baseball playing alternative in the Mountainside High School district.

The Mountainside JBO program is directly aligned with Mountainside High School and works closely with Ryan Fobert, the Mountainside High School Head Varsity baseball coach, and his coaching staff.   This strategic alignment aims in helping to provide the area's youth with the development, skills and competition needed to not only flourish as youth players, but also provide a segue to high school baseball.  

The goal of Mountainside JBO is to build a league of players who reside in the Mountainside High School boundaries and allow them to compete against other players of equal age and skill, while ultimately achieving their full baseball potential. And because of its connection to the the high school program, Mountainside JBO is in a unique position to prepare your child to play High School Baseball at Mountainside.

Mav Swag

The Stampede- Your Mavs in Action

Mountainside JBO is a proud member of the Westside JBO District

Contact Us

Contact Us

Mountainside JBO

Mailing Address

Mountainside JBO
14845 SW Murray Scholls Dr
#110 PMB 248
Beaverton, OR 97007