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 Mind

We provide a superior academic experience.  We prepare our students to be well-rounded 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:
-The Class of 2020 was awarded $9.1 million in college scholarships
- 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 for students with learning differences
- 4 year Advisory Program
- 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 Immersion experiences
-Science Bowl
-Literary Magazine
-Instrumental Music
-Studio Art
-Dozens of special-interest student clubs

Dare to be #ALLHEART

As Lasallians we are called to provide a human and Christian education.  We are proud to have served local and international students in our inclusive and faith based community for over 50 years.

The JS Value:
- 1:1 iPad programming has students equipped for in person, blended, and distance learning.
- 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
- Upgraded classroom and athletic facility renovations

List of 4 members.

  • Photo of Alicia Valdivia

    Alicia Valdivia 

    Director of Admissions; Instructor of Social Studies
    707.255.0950 ext. 621
  • Photo of Megan Dominici

    Megan Dominici '92 

    Director of Outreach
    707.255.0950 ext. 591
  • Photo of David Granucci

    David Granucci 

    Outreach Associate/Head Boys Basketball Coach
    707.255.0950 ext. 730
  • Photo of Jeremy Tayson

    Jeremy Tayson 

    Interim Director of Communications; Admissions Associate; Head Baseball Coach
    707.255.0950 ext. 734

Justin-Siena High School

4026 Maher Street
Napa, CA, 94558
United States
T: 707.255.0950 
F: 707.255.0334
Justin-Siena is a Lasallian Catholic college preparatory community that serves young men and women in grades 9–12.