The Democratic primary for the 2025 New York City mayoral election was held on June 24, 2025. Early voting for the primary began on June 14, 2025. This primary employed ranked-choice voting, and it was noted as the largest primary in New York City's history. State Assemblyman Zohran Mamdani won the Democratic nomination in a major upset over former Governor Andrew Cuomo and others. So, the key date for the NYC Democratic mayoral primary in 2025 was June 24, 2025, with early voting starting June 14, 2025.