In the 2010s, Dublin was the fastest growing city in California. Enrollment in
Dublin Unified School District increased 92% over that decade and by approximately 4,000 between 2014 and 2024, and the district has opened several new schools. Emerald High School is the district's second high school; it also has a
continuation school. It is the first comprehensive high school built in
Alameda County since the opening of
Foothill High School in
Pleasanton in 1973. After a committee had chosen three finalists from among community suggestions for the new school's name, on August 18, 2020, the school district board unanimously chose "Emerald High School". The school was originally projected to open in fall 2022, but instead opened to students the 2023-2024 school year with the first freshman class, and classes began in the 2024-2025 school year, opening with both freshman (9th graders) and sophomores (10th graders). In the 2025-2026 school year, Emerald welcomed freshman (9th graders), sophomores (10th graders), and juniors (11th graders). They will have seniors in the 2026-2027 school year, meaning that the Class of 2027 is the first to graduate Emerald High School. ==Opening==