2011 - GMA TV-48 Ilocos Sur began its broadcast via transmitter based at Mt. Caniao, Bantay, Ilocos Sur.
June 7, 2012 - GMA Ilocos launched as an originating station with its state-of-the-art facilities and studios located at Brgy. Bayubay Sur, San Vicente, which primarily covers the provinces of Ilocos Norte (via Channel 5), Abra (Channel 7) and Ilocos Sur (via Channel 48).
June 25, 2012 - GMA Ilocos launched its flagship local newscast Balitang Ilokano (later as 24 Oras Ilokano)
October 3, 2016 - GMA Ilocos began to simulcast GMA Dagupan's Balitang Amianan.
February 5, 2021 - GMA Ilocos started digital test broadcasts on UHF 15 covering Vigan and the provinces of Ilocos Sur and Ilocos Norte.
April 13, 2022 - GMA Ilocos reinaugurates its station in San Vicente, Ilocos Sur.
2022 - GMA Ilocos begins to split into two: GMA Ilocos Sur and GMA Ilocos Norte. On September 5, 2022, it started carrying One North Central Luzon, as part of GMA's plan to strengthen its regional news operation.