Ada W. Harris Elementary School serves grades three through six in Encinitas's Cardiff-by-the-Sea community, operating under CDS code 37-68007-6037758 within the Cardiff Elementary School District established in 1913. Students feed into the campus from the district's K-2 program at Cardiff Elementary School, maintaining continuity within a two-school district model that keeps enrollment at approximately 382 students with a 22-to-1 student-teacher ratio. State assessment data shows 73 percent of students scoring at or above proficiency in reading and 71 percent in math, positioning the Windsor Road campus among the top 11 percent of California elementary schools in SchoolDigger's composite ranking. The 1508 Windsor Road campus sits within walking distance of San Elijo Avenue and the Cardiff-by-the-Sea commercial corridor, with outdoor programming extending to the adjacent green space at Ada Harris Park. Title I Targeted Assistance status directs supplemental federal funding toward reading intervention and math enrichment for the 15 percent of students qualifying for free or reduced-price meals.