The 2021 Pacific hurricane season is an event in the annual tropical cyclone season in the North Pacific Ocean. It officially began on May 15 for the Eastern Pacific and on June 1 for the Central Pacific. Both seasons ended on November 30, though storms often develop outside the season boundaries. These dates, adopted by convention, historically describe the period in each year when most Eastern Pacific tropical systems form. However, storm formation is possible at any time of the year, as illustrated in 2021 by the formation of the season's first named storm, Tropical Storm Andres, on May 9. This was the earliest formation of a tropical storm on record in the basin, with all earlier tropical cyclones being found in the Central Pacific.