Head Start is a preschool program for families with low incomes and nearly 85% of child welfare-involved families are low-income, yet little is known about Head Start and child welfare collaboration. This study uses data from 28 Head Start directors to describe collaboration facilitators and barriers, and collaborative mechanisms in place. The mixed-methods study used data from a statewide survey and focus groups. Quantitative analysis used descriptive means and proportions. Qualitative analysis used a general inductive approach. Results show that nearly all Head Start programs prioritise enrollment for child welfare-involved children and know about foster care placement, but lack memoranda of understanding (50%), co-located staff (14%) and policies concerning joint service planning (9%). Directors report that Head Start staff need more support, including making referrals to child welfare. Cross-training, shared case planning, and streamlined processes could help move the organisations further along the developmental continuum of collaboration. (author abstract)