This study determined the prevalence of childhood experiences with child welfare supervision and placement among a cohort of 11,401 young sheltered homeless adults and assessed the associations between this prior involvement with child welfare services and the risk of experiencing recurrent and extended episodes of shelter use. This study used the administrative data from two New York City agencies: the Administration for Children's Services and the Department of Homeless Services. Overall, 29% had a childhood child welfare history, and 21% (74% of those with childhood child welfare histories) had histories of out-of-home placement through the child welfare system. Childhood out-of-home placement was associated with an increased number of days spent in shelters among family shelter users and with an increased likelihood of experiencing repeated shelter stays during early adulthood in both the family shelter and single-adult shelter groups. These findings underscore the need for more extensive support and housing services during early adulthood for persons with childhood child welfare histories.