Summer

High School Summer Program

General Courses (6 Weeks - Advancement)
  • Digital Photography
  • Algebra I
  • Geometry
  • Honors Geometry
  • Honors Algebra II
  • Chemistry
  • Honors Chemistry
  • Biology
  • Honors Biology
New for 2026
    • SAT Prep
    • Literature, Civilization, and the Individual: Myths, 106a (English Elective Course - 3 weeks, 5 credits)
Remediation (3 Weeks/Semester - Credit Recovery)
  • Algebra I
  • Geometry
  • Algebra II
  • Chemistry
  • Biology
  • English 9
  • English 10
  • English 11
  • Physics 9
  • World History
  • US History
  • Spanish I/II
Courses for Incoming Freshmen
  • Leadership Evenings
  • Transition to High School (3 Weeks)
  • Pre-High School Math and Science (3 Weeks)
  • Algebra 1
  • Geometry
  • Honors Geometry
  • Digital Photography

General Info

Registration begins in March!

Summer School Duration: June 8 to July 17, 2026
Semester 1 - June 8 to June 26, 2026
Semester 2 - June 29 to July 17, 2026
 
Daily Schedule: 
Period 1 - 9:00 am -11:50 pm
Period 2 - 12:20 pm - 3:10 pm
 
Summer School features a hybrid schedule of classes. Classes meet in-person Tuesday-Thursday and asynchronously Monday and Friday. 
 
Please note that Juneteenth (6/19) and Independence Day (7/4) are observed holidays and school is not in session on those days.
 
A $100 withdrawal fee will be charged for withdrawal from any courses after registering.  No refunds will be issued after June 9.

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 people in grades 9–12.