To report mental health screening rates in pediatric primary care as part of a larger program piloting Access to Tailored Autism INtegrated Care, a model promoting timely identification of mental health needs and care linkage for children with autism. Data were extracted from the Access to Tailored Autism INtegrated Care pilot in six pediatrics clinics within two organizations. Demographics and Pediatric Symptom Checklist-17 data were collected during well-child visit appointments over 4 months for 166 children with autism ages 4-16 years. 53% (n = 43) of 81 eligible children were screened in Organization 1 and 55% (n = 47) of 85 of eligible children were screened in Organization 2. In Organization 1, 47% screened positive, as evidenced by an elevated Pediatric Symptom Checklist-17 Total Score, while 36% screened positive in Organization 2. Children with positive screens had elevations on the Pediatric Symptom Checklist-17 Externalizing and Attention subscales but not on the Internalizing subscale, confirming typical trends in co-occurring challenging behavior presentations in children with autism. Slightly over half of eligible patients were Pediatric Symptom Checklist-17 screened. Positive screening rates were high, reinforcing the co-occurring nature of mental health needs in children with autism. Findings suggest opportunities to improve mental health screening in primary care for children with autism.