Redwood Empire and Mendocino Lake Chapter

For schools in the following ZIP codes:

94508, 94558-59, 94567, 94574-76, 94900-99, 95401-09, 95412, 95421, 95425-36, 95441-50, 95462-66, 95472-82, 95490, 95492-97

2026 Competition

Date and Location

Saturday, January 31, 2026

Sonoma Country Day School
4400 Day School Place
Santa Rosa, CA 95403

Interim Coordinator

Bill Angeloni, P.E.
angeloni@vom.com

Additional Contacts

If you have questions about the California MATHCOUNTS program in your area, please send a detailed email to CSPEEF Executive Director Heather Caya, at admin@cspeef.org.

If your question requires immediate assistance, please contact the National MATHCOUNTS Office at 703-684-2828 or info@mathcounts.org.

2025 Competition

Date and Location

Saturday, February 1, 2025

Sonoma Country Day School
4400 Day School Place
Santa Rosa, CA 95403

2024 Competition

Advancing Students

For the Redwood Empire Mendocino Lake Chapter in 2024, the members of the top three teams and the top three finishers NOT on an advancing team advance to the Northern California State Competition.

Team/
Ind.		 Student School
Coach
Team Jessie Hu Rincon Valley Middle School
Kelley Wattell
Team Scarlett McGarva Rincon Valley Middle School
Kelley Wattell
Team Benjamin Yoon Rincon Valley Middle School
Kelley Wattell
Team Jacob Yoon Rincon Valley Middle School
Kelley Wattell
Team Zoe Barker Sonoma Country Day School
Kelly Gaab
Team Arman Mohammadi Sonoma Country Day School
Kelly Gaab
Team Troy Pappas Sonoma Country Day School
Kelly Gaab
Team Brett Ryan Sonoma Country Day School
Kelly Gaab
Team Aarya Desai Instilling Goodness & Developing Virtue School
Yini Wang
Team Zhi Xuan Ooh Instilling Goodness & Developing Virtue School
Yini Wang
Team Sohyun Park Instilling Goodness & Developing Virtue School
Yini Wang
Team Ziquing Wang Instilling Goodness & Developing Virtue School
Yini Wang
Ind. Boyen Le Rincon Valley Middle School
Ind. Tiago Lubensky Davidson Academy Online
Ind. Jennifer Lin Miller Creek

2023 Competition

Advancing Students

For the Redwood Empire Mendocino Lake Chapter, the members of the top team and the top 2 finishers NOT on an advancing team advance to the Northern California State Competition.

Team/
Ind.		 Student School
Coach
Team Daniel Chang Rincon Valley Middle School
Simon Terrell
Team Sungye Kim Rincon Valley Middle School
Team Jocelyn Wang Rincon Valley Middle School
Team Alexander Yoon Rincon Valley Middle School
Ind. Jessie Hu Rincon Valley Middle School
Ind. Joseph Collins Non-School Competitor

MATHCOUNTS of California is sponsored by:

Donations

2026

$500 — Department of Defense STEM Grant
$1,000 — Poppy Bank

2025

$1,000 — Poppy Bank

How to Donate

MATHCOUNTS of California relies on local donations to run chapter competitions. Please help us grow the appreciation of math and problem solving among California middle school students. For a donation to benefit the entire state, click here.

To donate by check, please make the check out to:

MATHCOUNTS of California
1104 Corporate Way
Sacramento, CA 95831

Please put the competition name in the memo line.

A receipt will be sent to the address on the check.