Our Additional Programs

Additional School Care (ASC) follows basic Montessori principles in terms of encouraging children to help and teach one another, to follow projects through to completion, to create their own activities, and to care for their environment.

With some restrictions, parents can choose to have their children participate in ASC through Full-year Package ASC, Reserved ASC, or Drop-in ASC. Check out the details below.

 

Each semester, we offer Bayside Afternoon Classes for Full-Day Primary (4 years old and older) and Elementary students. 

The Registration Lottery for Winter 2025 classes opens on Wednesday, November 5, and closes on Thursday, November 13. 

Winter BAC starts the week of January 12, 2026.

Once you have registered and your child has been selected through the BAC Lottery on November 13, 2025, your enrollment is considered final. Refunds will not be issued once registration is confirmed on November 13, 2025.

Be sure to register for each class separately. For more about the lottery system, click the tab above.

How To Register

1. Log into your Parent Portal.

2. Go to the “Extended Care” tab.

3. In the “Participants” sub-tab, select your child's name for the correct BAC session and click "View Signups."

4. On the next page, make your BAC selection(s).

How to Opt Out or Cancel a BAC Session

1. Log into your Parent Portal. 
2. Go to the “Extended Care” tab.
3. In the “Participants” sub-tab, select your child's name for the correct BAC session and click "View Signups."
4. On the next page in the Session Calendar, click on the day(s) you wish to cancel and select “Opt Out.”

Winter 2026 Options

Primary

Yoga with Kathy |for Full-Day primary children 4-6 years old

• Tuesdays, 3:00-4:00 pm

• 8 sessions: January 13, 20, 27, February 3, 10, (No class February 17 – Mid-Winter Break), February 24, March 3, 10

• Class minimum/maximum: 6/12

• Registration: $375
  
  This winter indoor yoga class will focus on breathing and mastering poses and routines that will enable children to develop self-guided practice on their own. We will work individually as well as with partners. The goal is to have a relaxed, gentle environment in which the children feel safe to try new things and learn to relax in their own space. We will have some guided instruction and play games. Each day, the class will open and close with appreciations and gratitudes about their day and others in the class. 
  
  Kathy Winkler has been teaching young children for over 20 years. She is the Movement Specialist at MMS and taught kindergarten for 16 years before joining MMS. She holds a BA in Economics from UC Davis and a Multiple Subjects Credential from UOP. Passionate about the outdoors, Kathy enjoys trail running, ocean swimming, paddle boarding, and yoga. For questions, contact Kathy at kwinkler@marinmontessori.org.
   

Art with Rose |For Full-Day Primary children 4-6 years old

• Thursdays, 3:00 - 4:00 pm
• 8 sessions: January 15, 22, 29, February 5, 12, (No class February 19 – Mid-Winter Break), February 26, March 5, 12
• Class minimum/maximum: 6/12
• Registration: $375
• Materials fee: $20
   

Join Rose for a joyful art class designed especially for young creators. Each week, the children will explore color, shape and texture through hands-on projects using watercolor, collage and natural materials, among other mediums. The focus will be on the creative process of making art. We’ll practice, we’ll experiment, we’ll express ideas on the page. Together, in this fun after-school class, we’ll nurture curiosity and a love of making art.

Rose Martin is a Primary Support Specialist at Marin Montessori School and brings over a decade of experience teaching young children. With a background in the arts and architecture, she helps children see beauty and design in the world around them. Rose holds a bachelor's degree in history from the City University of New York and a master's degree in architecture from Yale University. For questions about the class, contact Rose at rmartin@marinmontessori.org.

Primary Spanish with Adriana Romo |FOr Full-Day Primary children 4-6 years old

• Wednesdays, 3:00-4:00 pm

• 8 sessions: January 14, 21, 28, February 4, 11, (No class February 18 – Mid-Winter Break), February 25, March 4, 11

• Class minimum/maximum: 6/12

• Registration: $375
  
  Our after-school Spanish program encourages self-directed exploration and hands-on learning, allowing each child to engage with the language in meaningful and developmentally appropriate ways. Through co-curricular lessons, students experience Spanish as a living language, integrated into stories, songs, and purposeful activities that nurture both communication and cultural understanding. Each session begins with a welcoming circle to build community and foster oral expression, followed by storytelling and guided lessons that introduce new vocabulary and concepts within a natural context. Children participate in songs, art projects, and sensorial activities that connect language learning with movement, creativity, and real-world experiences. Authentic materials, including Spanish literature, music, and foods, invite children to experience the richness and diversity of Spanish-speaking cultures. The goal is to foster a love for the Spanish language and its vibrant culture.
  
  Adriana Romo brings 10 years of experience in early childhood education and holds a degree in Early Childhood Education from Diablo Valley College. Certified through the North American Montessori Center, she combines her Montessori training with a deep passion for language and literacy. Adriana first discovered her love for literacy and cultural expression while participating in a program that used Ballet Folklórico (a traditional Mexican dance) to teach Spanish. Over the past four years, she has integrated Spanish language and culture into Montessori environments, inspiring children to learn with curiosity, creativity, and joy. For questions, contact Adriana at aromo@marinmontessori.org.

 

Elementary

Cooking with Adeline   | FOR ELEMENTARY CHILDREN (1ST-6TH YEAR)

• Tuesdays, 3:30 - 4:45 pm  (1 hr and 15 min class)

• 8 sessions: January 13, 20, 27, February 3, 10, (No class February 17 – Mid-Winter Break), February 24, March 3, 10

• Class minimum/maximum: 6/16

• Registration: $375

• Materials fee: $25
  
  This elevated culinary experience is designed to challenge, inspire, and expand the skills of young chefs. Like previous culinary offerings with Adeline, this class will introduce a range of ingredients, techniques, and flavors. Students will experiment with both familiar and brand-new ingredients while discovering recipes that introduce fresh flavors and fun challenges. While this may be an adjustment for some, the class will encourage curiosity and create a safe and supportive space for culinary exploration.
  
  Adeline's goal is to help children grow in confidence and creativity in the kitchen, challenge their palates in a fun and approachable way, and leave class proud of what they've made. A lifelong food enthusiast, Adeline brings her passion and playful spirit to each lesson, inspiring children to explore new tastes, trust their instincts, and celebrate the fun of cooking. For questions about the class, contact Adeline at ashrout@marinmontessori.org.
   

Chess with Leonardo  |For Elementary Children (1st-6th Year)

• Wednesdays, 3:30 - 4:30 pm

• 8 sessions: January 14, 21, 28, February 4, 11, (No class February 18 – Mid-Winter Break), February 25, March 4, 11

• Class minimum/maximum: 6/16

• Registration: $375
  
  Marin Chess' after-school program introduces students to the exciting world of chess in a fun and supportive environment. Our classes cover key strategies, tactics, and game principles while helping students develop critical thinking and problem-solving skills. Chess challenges students to think ahead, analyze positions, and make strategic decisions, skills that benefit them both on and off the board. Through hands-on instruction and structured play, students sharpen focus, improve concentration, and learn to adapt in a dynamic and interactive setting. Join our chess program and experience the fun and excitement of the world's best strategy game!
  
  Born and raised in Marin County, Leonardo Maso is a lead instructor with Marin Chess. He has taught at ten schools and worked with more than 150 students across Marin and Sonoma Counties. Leonardo focuses on helping each child strengthen their critical-thinking and problem-solving skills through hands-on learning. He encourages students to discover strategies independently through guided problem solving rather than being given the answers. Leonardo is passionate about creating spaces where students can have fun, build confidence, and grow as both players and thinkers. He is committed to ensuring that every class he teaches inspires curiosity, growth, and a lifelong love of learning. For questions about the class, please reach out to Marin Chess at stanley@marinchesscamp.com. 
   

Elementary Spanish with Andrea |FOR ELEMENTARY CHILDREN (1ST-6TH YEAR)

• Wednesdays, 3:30 - 4:30 pm

• 8 sessions: January 14, 21, 28, February 4, 11, (No class February 18 – Mid-Winter Break), February 25, March 4, 11

• Class minimum/maximum: 6/14

• Registration: $375
  
  In this after-school class, children will join Andrea to build, experiment, and create. The goal is to provide a natural and immersive environment for language development. The class will integrate the elements of science, art, craft, and cultural exploration, encouraging creativity and collaboration. It’s a thoughtful space where children engage deeply, and Spanish becomes part of their process and expression.
  
  Andrea brings over a decade of experience in education, working with children of diverse ages in various roles, including AMI Montessori Guide, Spanish teacher, preschool caregiver, and humanitarian volunteer. Growing up in a family of educators, her passion for teaching began early. She attended an Italian-founded school, where she gained rich, multicultural experiences that shaped her approach to education.
  
  Andrea volunteered in underserved communities during university, creating libraries and workshops for children and mothers. After specializing in Europe and working in international banking, she returned to her true calling—education. She pursued Montessori pedagogy training and has taught French and Spanish as an AMI Montessori Guide in elementary education for the past five years. Passionate about fostering deep connections with children and families, she believes in the transformative power of education to bridge cultures and enrich lives. For questions about the class, contact Andrea at abeltran@marinmontessori.org. 
   

Sustainable Sewing with Ashley |FOR ELEMENTARY CHILDREN (1ST-6TH YEAR)

• Thursdays 3:30 - 4:30 pm

• 8 sessions: January 15, 22, 29, February 5, 12, (No class February 19 – Mid-Winter Break), February 26, March 5, 12

• Class minimum/maximum: 6/12

• Registration: $375

• Materials Fee: $20
  
  Come learn the basics of sewing! In this fun, hands-on class, the children will learn to sew while also discovering how we can use creativity to help keep fabric and well-loved textiles out of landfills. Using both machine and hand-sewing, we will take recycled fabrics and self-drafted patterns to create a small collection of items, including (but not limited to) pants, dresses, skirts, bags, oven mitts, and more. We will discuss how to repurpose, repair, and reimagine our old clothes and fabrics, giving new life to something that would have otherwise been discarded. It is a wonderful opportunity to practice sustainability and self-expression!

  Textile and fiber art have been my art forms of choice for over 25 years. Knitting and crochet are my passions, and I have been sewing my own clothes for several years. Handwork will never become a lost art if I have anything to say about it! I love being able to share the joy and magic of giving children yarn or fabric and showing them how their hands and minds can create something warm and beautiful to wear. For questions about the class, contact Ashley at aanderson@marinmontessori.org.
   

The Science of Baking with Kate |FOR ELEMENTARY CHILDREN (1ST-6TH YEAR)

• Thursdays, 3:30 - 4:45 pm (1 hr and 15 min class)

• 8 sessions: January 15, 22, 29, February 5, 12, (No class February 19 – Mid-Winter Break), February 26, March 5, 12

• Class minimum/maximum: 6/14

• Registration: $375

• Materials Fee: $20
  
  In this hands-on baking class, students will embark on a delicious journey exploring sweet and savory baked goods from around the world. Each week, they will dive into a new recipe, learning essential baking techniques while discovering the cultural roots of different treats. From kneading and shaping dough to mastering delicate pastries, children will gain confidence in the kitchen while developing a deeper understanding of the science behind baking.

  Through measuring, mixing, and experimenting with ingredients, students will explore how chemistry transforms simple components into delightful creations. Along the way, they’ll develop practical kitchen skills, teamwork, and an appreciation for the art of baking. Whether they’re rolling out dough, whipping up a batter, or perfecting their bakes, this class offers a fun and educational experience for young chefs to build confidence in the kitchen. 

  Kate earned her bachelor’s degree in civil engineering with an environmental emphasis. She later went on to earn her Association Montessori Internationale (AMI) Elementary diploma from Montessori Northwest and her master’s degree in Montessori education from Whitworth University. Her love for creating in the kitchen was sparked by many summer weekends spent baking huckleberry pies and sweet bread with her grandparents. Using a scientific approach to experimenting with her baked goods, Kate has spent years exploring all that goes into the baking process of the sweet and savory creations the world has to offer. Kate’s goal is to help children fall in love with the creative, active, and methodical experience of baking. For questions about the class, contact Kate at kpicanco@marinmontessori.org. 

BAC Class Sign-up Registration

Registration Window: A designated one-week window will be announced for all sessions, during which all participating families can register their children for their desired after-school classes.

Lottery System: Once the registration window closes, a randomized lottery will be conducted for classes with more applicants than available spaces. All registered families for an oversubscribed class will have an equal chance of securing a spot, regardless of when they submitted their registration. You will automatically be placed on the waitlist when you sign up – please ignore your waitlist number. Your waitlist number is not an indication of being signed up. 

Notification: Shortly after the lottery, families will be notified of their child's enrollment status (enrolled or waitlisted).

Waitlist: A waitlist will be established for oversubscribed classes, and enrolled families may choose to add their child's name to the list in case of openings.

We believe this system offers several benefits, including:

Fairer Access: Ensures equal opportunity for all families to secure a spot in their desired classes.

Reduced Stress: Eliminates the need for families to rush and be online at specific times.

Transparency: Provides a clear and predictable registration process.