a new feature in Pokémon GO starting December 2020 was the inclusion of seasons. These seasons are a combination of the meteorological temperate seasons as well as being themed towards other elements going around in Pokémon GO and the Pokémon franchise in general

List of Seasons

Season of Rising HeroesSeason of Rising HeroesMarch 1st 2023 - June 1st 2023
Season of Mythical WishesSeason of Mythical WishesDecember 1st 2022 - March 1st 2023
Season of LightSeason of LightSeptember 1st 2022 - December 1st 2022
Season of GOSeason of GOJune 1st 2022 - September 1st 2022
Season of AlolaSeason of AlolaMarch 1st 2022 - June 1st 2022
Season of HeritageSeason of HeritageDecember 1st 2021 - March 1st 2022
Season of MischiefSeason of MischiefSeptember 1st 2021 - December 1st 2021
Season of DiscoverySeason of DiscoveryJune 1st 2021 - September 1st 2021
Season of LegendsSeason of LegendsMarch 1st 2021 - June 1st 2021
Season of CelebrationSeason of CelebrationDecember 1st 2020 - February 28th 2021