Diablo Chapter

For schools in the following ZIP codes

94506-07, 94510-24, 94526-28, 94531-35, 94548-57, 94561-63, 94565-66, 94568-71, 94582-86, 94588-99, 95410-11, 95413, 95416-20, 95423-24, 95620, 95625, 95637, 95653, 95683

2026 Competition

Date and Location

Saturday, February 21, 2026

Harvest Park Middle School
4900 Valley Ave.
Pleasanton, CA 94566

Coordinators

Jerry Li
925-922-3106
jerrylinew@gmail.com

Karen Hollingsworth
920-931-5189
kholling7@gmail.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 22, 2025

Harvest Park Middle School
4900 Valley Ave.
Pleasanton, CA 94566

2024 Competition

Advancing Students

For the Diablo Chapter in 2024, members of the top four teams and the top five finishers NOT on an advancing team advance to the Northern California State Competition.

Team/
Ind.		 Student School
Team 1 Shihan Feng Thomas Hart Middle School
Abrianna Zhang
Team 1 Taiba Hanif Thomas Hart Middle School
Abrianna Zhang
Team 1 Preston Ng Thomas Hart Middle School
Abrianna Zhang
Team 1 Shreyas Reddy Thomas Hart Middle School
Abrianna Zhang
Team 2 Tannishtha Chakraborty Windemere Ranch Middle School
David Zhang
Team 2 Arhaad Reddy Windemere Ranch Middle School
David Zhang
Team 2 Ashwin Shekhar Windemere Ranch Middle School
David Zhang
Team 2 Andrew Sun Windemere Ranch Middle School
David Zhang
Team 3 Neelkanth Brahmachari Harvest Park Middle School
Randy Lomas
Team 3 Ryan Chen Harvest Park Middle School
Randy Lomas
Team 3 Ruikang Wang Harvest Park Middle School
Randy Lomas
Team 3 Lusen Yao Harvest Park Middle School
Randy Lomas
Team 4 Elain Gu Quarry Lane School
Rebecca Guindi
Team 4 Pranshu Khanna Quarry Lane School
Rebecca Guindi
Team 4 Christon Rex Quarry Lane School
Rebecca Guindi
Team 4 Jesse Wu Quarry Lane School
Rebecca Guindi
Ind. Ayan Sharma Harvest Park Middle School
Randy Lomas
Ind. Angela Yang Dorris Eaton School
Eddie Lee
Ind. Leo Xie Eleanor Murray Fallon School
Sophia Henningson
Ind. Siddharth Suresh Thomas Hart Middle School
Abrianna Zhang
Ind. Shlock Acharya Quarry Lane School
Rebecca Guindi

2023 Competition

Advancing Students

For the Diablo Chapter, members of the top two teams and the top three finishers NOT on an advancing team will advance to the Northern California State Competition.

Team/
Ind.		 Student School
1 Seojin Kim Harvest Park Middle School
1 Matthew Sun Harvest Park Middle School
1 Nicole Sun Harvest Park Middle School
1 Lusen Yao Harvest Park Middle School
2 Arnav Kumar Thomas Hart Middle School
2 Preston Ng Thomas Hart Middle School
2 Vatsal Srivastava Thomas Hart Middle School
2 Kevin Zhang Thomas Hart Middle School
Ind. Olin Xia Dorris-Eaton School
Ind. Ryan Wang Dorris-Eaton School
Ind. Dalbert Wu Harvest Park Middle School

MATHCOUNTS of California is sponsored by:

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.