Festivals /North America /United States /BOO! Seattle BOO! Seattle 2026 30–31 October 2026 United States announced Price TBA Official site · seattle.boo-halloween.com JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD 30 – 31 Oct 2026 More festivals in October About BOO! Seattle Letters Letters open after 31 October 2026.