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Audubon Aquarium of the Americas is least busy during weekday afternoons, especially after 2:30 p.m. Peak season begins as early as March and goes through the summer, with school field trips and day camps visiting the Aquarium in the early part of the day. Low season is September through January. Buy your tickets online in advance to avoid long lines. Weekends, holidays and special event days are most busy at the Aquarium.