Born in Las Palmas in the Canary Islands. Through the National University of Distance Education (UNED), he graduated in Political Sciences and Sociology, and earned master's degrees in Prevention of Occupational Hazards and Training of Trainers.[1] His father, Augusto Hidalgo Champsaur, was labour lawyer and anti-Francoist activist.[2][3] According to his own official online biography, the younger Hidalgo was suspended from school at the age of 14 for going on strike.[4]
In October 2014, Hidalgo won the primary to be the PSOE candidate for mayor of Las Palmas in the 2015 election.[5] In June, he succeeded the People's Party (PP) incumbent Juan José Cardona as mayor, with support from Podemos and local left-wing party New Canaries.[6] The three-way pact was repeated in 2019.[4] In 2015, his was the second-largest city governed by the PSOE, after Seville; news agency EFE named him as a representative of a wave of progressive mayors elected that year while saying that he differed from his contemporaries such as Abel Caballero (Vigo) and José María González Santos (Cádiz) in having a more reserved personality and approach.[4]
As of 2019, Hidalgo is married and has a daughter.[4]