This study investigated the effectiveness of an aquatic playgroup on the playfulness of children, ages 2 to 3 with autism spectrum disorder. Using a repeated measures design, we followed 10 children and their caregivers who participated in a 6-week aquatic playgroup in southwest Florida. Four dyads completed the entire 12-week study period. The Test of Playfulness (ToP) and Test of Environmental Supportiveness (TOES) were used to measure playfulness, caregiver's promotion of play, and adequacy of the sensory environment at 3 time points: before and after a six-week playgroup and at a four-week follow-up. Children demonstrated a statistically significant increase in playfulness after aquatic playgroup intervention F (2,6) = 9.55; ?[subscript p][superscript 2] = 0.85, p = 0.014. The sensory environment at the pool was more conducive for play ?[superscript 2] (2) = 7.54, p = 0.023 after playgroup intervention, while no significant effects were seen in caregivers ability to promote play opportunities. An aquatic playgroup in the community may improve the playfulness of young children with autism spectrum disorder (ASD).