The impact of the pandemic on California students' learning, gauged from 18 school districts in the CORE Data Collaborative, highlights significant learning loss in English Language Arts (ELA) and Math, primarily affecting younger grades. The equity gap is pronounced, notably among low-income students and English language learners (ELLs), experiencing more substantial setbacks than their counterparts. Socioeconomically disadvantaged students faced slower growth, while others accelerated their learning, intensifying existing achievement disparities. Upper-grade ELLs encountered severe setbacks due to challenges in virtual language development. These findings underscore the urgent need for targeted support to redress these disparities, emphasizing the gravity of unequal experiences during the pandemic. Yet, data limitations call for deeper investigations into absent student groups to refine learning loss estimates. Addressing this crisis necessitates a student-centric approach, prioritizing social-emotional well-being and systemic educational reforms to accommodate diverse student needs.