Our mixed-method study examined the mental health of Latinx children in migrant farmworker (LMFW) families, assessed whether acculturative stressors contributed to mental health problems, and examined whether family warmth and support counteracted the negative effects of acculturative stressors on mental health. Participants were children aged 6-18 (N = 80, mean age = 11.71, 55% male) participating in two summer Migrant Education Programs in Indiana. Overall, we found support for associations between acculturative stressors and poor mental health in LMFW children utilizing multiple data sources that included child self-reports, teacher reports, and qualitative interviews. We also found evidence in qualitative interviews and teacher reports for the positive association between perceived maternal supportive parenting and children's mental health. Findings suggested that while LMFW children are vulnerable to anxiety and depressive problems, perceptions of family support (particularly from mothers) are especially salient for their resilience and mental health. Differences by age and child sex are also discussed.