Admissions

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 a personal 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 Believe. We Love. We Will. We are ALLHEART. 

Engage your Mind

We provide a superior academic experience.  We prepare our students to be well-rounded and well-prepared for college and 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 2021 was awarded $10 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
     • 3 guidance counselors
     • 2 college counselors
     • Student Support Program accommodating students with learning differences
- 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 discover their talents. These opportunities provide a motivated environment geared towards testing limits and discovering potential. 



The JS Value

-Braves Athletics
-Visual and Performing Arts
-Mock Trial
-Robotics
-Lasallian Student Leadership
-Student Ambassadors
-Retreat and Immersion experiences
-Service and Outreach opportunities
-Choral
-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 55 years.



The JS Value
- 1:1 iPad program equips students for all modes of learning
- 9 AM start time accommodates adolescent sleep needs and enhances commuting
- 7 buses serving 9 towns and 3 counties to transport students to and from school, sports, and more
- $3.8M in tuition assistance available for a wide range of financial realities
- Merit-Based Scholarships
- Welcoming campus with well-maintained classrooms and upgraded athletic facilities
-On-site modern Dining Hall offering fresh and tasty food for a variety of diets and palates

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 

    Director of Communications; 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.