Why Justin-Siena?

Our Mission

Justin-Siena is a Catholic high school in the Lasallian tradition called to provide educational excellence in a loving, Christ-centered community that prepares students to serve and to lead in an ever-changing world.

Our Culture

Our culture expects both an internal drive to use our gifts to the best of our abilities and an altruistic drive to leave this world better than we found it.

We are ALLHeart. We believe. We love. We will.

Engage your Intellect

We provide a superior academic experience.  We prepare our students to be well round and well prepared for college & life. At the heart of the rigorous, college preparatory academic experience at Justin-Siena is our commitment to fostering a personal, caring, and challenging atmosphere.

The JS Value
- Average class size of 22
- 40 Honors/Advanced Placement© courses
- 17 electives in engineering, science and the arts
- Robust Counseling Program with: 
     • 3 guidance counselors
     • 2 college counselors
     • 2 student support counselors
- 4 year Advisory Program
- Student Support Program for students with learning differences
- Community and study periods 

Test your Wings

When a challenging curriculum is paired with enriching activities outside the classroom, students are able to further discover their talents within. These opportunities provide students with an environment geared toward testing their limits and discovering their potential.

The JS Value:
-Braves Athletics
-Visual and Performing Arts
-Mock Trial
-Lasallian Student Leadership
-Retreat and Immersions experiences
-Science Bowl
-Literary Magazine
-Instrumental Music
-Studio Art
-Dozens of special-interest student clubs


As Lasallians we are called to provide a human and Christian education.  Locally, we are proud to serve students from Napa, Solano and Sonoma Counties. Internationally, we are proud to serve students from 3 counties.  

The JS Value:
- 9 a.m. start time makes adolescent sleep needs and commuting a reality
- 7 busses serving 9 towns and 3 counties to get students to and from school, sports and more.
- Tuition Assistance for wide ranges of financial realities
- Merit-Based Scholarships
- The Class of 2019 was awarded $8.5 million in college scholarships
- Upgraded classroom and athletic facility renovations

List of 4 members.

Justin-Siena High School

Justin-Siena is a Lasallian Catholic college preparatory community that serves young men and women in grades 9–12.