Pokémon GO’s Pokémon Horizons event runs September 16–22, 2026
Serebii says the collaboration starts at 10 a.m. on September 16 and ends at 11:59 p.m. on September 22, with both times local.
TLDR
Serebii reported on September 15 that Pokémon GO’s Pokémon Horizons collaboration was starting to roll out. The event runs from 10 a.m. local time on September 16 to 11:59 p.m. local time on September 22, 2026. Serebii’s event guide covers special spawns, new Shiny Pokémon and Research.
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