School Calendar
School Calendar
September 2025
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Varsity Girls Golf vs Sonoma Valley High School
AwayGirls Varsity Golf vs Sonoma Valley High School -
Frosh Volleyball vs Sonoma Valley High School
HomePlaying Fields - Clark GymFrosh Volleyball vs Sonoma Valley High School -
JV Volleyball vs Sonoma Valley High School
HomePlaying Fields - Clark GymJV Volleyball vs Sonoma Valley High School -
Varsity Girls Volleyball vs Sonoma Valley High School
HomePlaying Fields - Clark GymVarsity Volleyball vs Sonoma Valley High School -
Frosh Volleyball vs Napa High School
HomePlaying Fields - Clark GymFrosh Volleyball vs Napa High School -
Varsity Volleyball vs Napa High School
HomePlaying Fields - Clark GymVarsity Volleyball vs Napa High School -
International Day of Charity
Date was chosen by the U.N. General Assembly to commemorate the anniversary of the death of Mother Teresa of Calcutta, who received the Nobel Peace Prize in 1979 "for work undertaken in the struggle to overcome poverty and distress, which also constitute a threat to peace." -
LEAP Lunch meeting
Gasser Center -
Varsity Football vs St. Helena High School
HomePlaying Fields - Dodd StadiumVarsity Football vs St Helena High School -
Varsity Cheer vs St. Helena High School
HomePlaying Fields - Dodd StadiumVarsity Cheer vs St Helena High School -
Varsity Girls Tennis vs Marin Catholic High School
AwayGirls Varsity Tennis vs Marin Catholic High School -
College Application Workshop (Seniors)
College Counseling Center (CBC)Seniors are encouraged to work on their college applications and essays. First hour will be spent working specifically on the Cal State Apply application. During the remaining time, College Counselors will be available to help students complete online applications and provide one-on-one feedback on college essays. Â
Contact College Counseling: Mr. Flores at rflores@justin-siena.org or ext. 740
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Varsity Girls Golf vs American Canyon High School
HomeGirls Varsity Golf vs American Canyon High School -
Frosh Volleyball vs American Canyon High School
HomePlaying Fields - Clark GymFrosh Volleyball vs American Canyon High School -
JV Volleyball vs American Canyon High School
HomePlaying Fields - Clark GymJV Volleyball vs American Canyon High School -
Varsity Volleyball vs American Canyon High School
HomePlaying Fields - Clark GymVarsity Volleyball vs Petaluma High School -
College Application Workshop (Seniors)
College Counseling Center (CBC)Seniors are encouraged to work on their college applications and essays. First hour will be spent working specifically on the Cal State Apply application. During the remaining time, College Counselors will be available to help students complete online applications and provide one-on-one feedback on college essays. Â
Contact College Counseling: Mr. Flores at rflores@justin-siena.org or ext. 740
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Varsity Girls Tennis vs Napa High School
HomePlaying Fields - Tennis CourtsGirls Varsity Tennis vs Napa High School -
Frosh Volleyball vs Casa Grande High School
HomePlaying Fields - Clark GymFrosh Volleyball vs Casa Grande High School -
JV Volleyball vs Casa Grande High School
HomePlaying Fields - Clark GymJV Volleyball vs Casa Grande High School -
Varsity Volleyball vs Casa Grande High School
HomePlaying Fields - Clark GymVarsity Volleyball vs Casa Grande High School -
Varsity Girls Tennis vs American Canyon High School
HomePlaying Fields - Tennis CourtsGirls Varsity Tennis vs American Canyon High School -
Frosh Volleyball vs Cardinal Newman High School
AwayFrosh Volleyball vs Cardinal Newman High School -
Varsity Volleyball at Cardinal Newman High School
AwayVarsity Volleyball vs Cardinal Newman High School -
Senior College Night
Gasser CenterThis event is hosted for current seniors & Parents. The College Counseling Department offers substantial support in coordinating and organizing school materials required for applying to colleges. College counselors will provide the Justin-Siena college application process, including important forms and timeline electronically.Â
Contact College Counseling: Ramiro Flores at rflores@justin-siena.org or ext. 740Â
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A3 Early Release Schedule
A Day Early Release Schedule
- 9:00 - 10:15 First Class PeriodÂ
- 10:15 - 10:30 Break
- 10:30 -Â 11:50 Second Class PeriodÂ
- Passing Period
- 11:55 - 1:10 Third Class Period
- 1:10 - 1:45 Lunch
- 1:45 Buses depart
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Brave For A Day
We invite you to visit Justin-Siena High School through our Brave for a Day and Parent Talk & Tour visits. Led by our Student Ambassadors, these visits offer a comprehensive experience for prospective families. These visits are for both student and parents. The visit runs from 8:45am to 11:00am.  Click here to register. -
Leadership Team Meeting
Leadership Team meetings are tentatively set for every other Wednesday at 11:45am. Expect some editing along the way as I am not sure if we want them to be monthly next year. -
Varsity Girls Tennis vs Casa Grande High School
AwayGirls Varsity Tennis vs Casa Grande High School -
Frosh Volleyball vs Petaluma High School
HomePlaying Fields - Clark GymFrosh Volleyball vs Petaluma High School -
JV Volleyball vs Petaluma High School
HomePlaying Fields - Clark GymJV Volleyball vs Petaluma High School -
Varsity Volleyball vs Petaluma High School
HomePlaying Fields - Clark GymVarsity Volleyball vs Petaluma High School -
Frosh Volleyball vs St. Vincent de Paul High School
HomePlaying Fields - Clark GymFrosh Volleyball vs St Vincent De Paul High School -
Varsity Volleyball vs St. Vincent de Paul High School
HomePlaying Fields - Clark GymVarsity Volleyball vs St Vincent De Paul High School -
Varsity Girls Tennis vs Petaluma High School
HomePlaying Fields - Tennis CourtsGirls Varsity Tennis vs Petaluma High School -
Varsity Girls Golf vs Sonoma Valley High School
HomeGirls Varsity Golf vs Sonoma Valley High School -
Varsity Volleyball at Sonoma Valley High School
AwayVarsity Volleyball vs Sonoma Valley High School -
Homecoming Mixer
CBC Courtyard -
Homecoming Football Game
Dodd Stadium -
Homecoming Dance
Clark Gym
