List of off-season Pacific hurricanes

There have been 26 recorded tropical and subtropical cyclones in the North-eastern Pacific basin outside the official Pacific hurricane season. The National Hurricane Center (NHC) monitors the area from North America westward to 140°W, while the Central Pacific Hurricane Center is from 140°W to the International Date Line, north of the equator. The National Oceanic and Atmospheric Administration (NOAA) currently defines the season as starting May 15 in the eastern Pacific and June 1 for the central Pacific and ending on November 30 for both regions in each calendar year. Occasionally, however, storms develop in late November and persist until December.

Few off-season tropical cyclones in the east Pacific have affected land, and none of them have made landfall. Only Hurricane Nina caused both property damage and fatalities. It prompted evacuations in Hawaii and caused $100,000 (1957 USD) in damage in the state. The storm also killed four people and produced 35 ft waves. The strongest hurricane between December and May was Hurricane Ekeka in 1992, which reached winds of 115 mph. In 1997, after Tropical Storm Paka crossed the International Date Line, it intensified into a typhoon with winds equivalent to a Category 5 hurricane on the Saffir–Simpson hurricane wind scale, and caused $580 million (1997 USD) in damage in the Marshall Islands, Guam, and the Northern Mariana Islands. The most recent off-season storm is Tropical Storm Andres in mid-May 2021.

The beginning of HURDAT, the official Pacific hurricane database maintained by the NHC, is 1949. Since then, thirteen storms have occurred outside the official bounds of hurricane season in the eastern and central north Pacific, respectively. The first storm officially to occur outside of the current season was Hurricane Nina in 1957. In addition, the CPHC reports nine off-season storms from 1900 to 1952 with another off-season tropical cyclone occurring in 1832. There have been documents published in the Monthly Weather Review reporting additional off-season storms within 2,000 mi of the Mexican coastline, including one in December. Of all off-season tropical cyclones, the "Froc Cyclone" lasted longest, spanning 12 days and two calendar years. The year with the most off-season storms was tied between 1904 and 1992, with a total of two tropical cyclones. No Pacific hurricane season had both a pre-season and post-season storm.

Chronology
The wind speeds listed are maximum one-minute average sustained winds. The category refers to the intensity on the Saffir–Simpson hurricane wind scale; TS stands for tropical storm, and TD for tropical depression.

Systems by month
Off-season storms are most likely to occur in December, followed by May. Only one cyclone each was reported in February or in March.