Few boats sail west beyond Hawaii in the N. Pacific compared to the number of boats that cross the S. pacific each year. It is unusual for a cruising boat to make the entire Pacific crossing in one year.
Generally, boats leave from Southern California, Mexico, or Panama around March, April, or May, arriving in French Polynesia (with perhaps a stop in the Galapagos) 3 weeks or so later. Few boat want to try to sail east back to French Polynesia, so they will spend most of their first season crusing there. With an initial visa for three months and the chance to extend, boats start leaving French Polynesia in August or September, perhaps later. They must be out of French Polynesia by November. Cyclone season in the S. Pacific starts officially on December 1. Boats usually choose to spend cyclone season in New Zealand, thus giving them at least one more season in the S. Pacific, sailing up to Tonga or Fiji the following June or so. Boats in a hurry will possibly carry on to Australia, to arrive around the 1st of December.
Boats in Australia will start heading north to Darwin in about April or May, arriving in Darwin some time between June and September, where they will head up to SE Asia, the Philippines, Papua New Guinea, or the Solomon Islands.
There are variations. some boats will head into the North Pacific from Fr. Polynesia or Samoa. Some will stay in the N. Pacific from Hawaii, often making a stop in Guam. There is no Northwest Pacific "season", typhoons can form in any month of the year, so boats are a bit more cautious.
That's a general picture. Your best bet is to look at a good map of the Pacific, keeping the six-month cyclone season in mind for both hemispheres. The distances are vast, and cruising boats are usually not interested in making fast passages, but rather seeing as much as they can.
Good luck and fair winds.