Adolescents, particularly those with autism spectrum disorders, increasingly use psychiatric emergency services. Such risk is further greater in girls. Available knowledge on young people with autism during crises lacks understanding of gender differences and of differences between typically developing adolescents and adolescents with autism. After psychiatric emergency consultations, we therefore compared the symptomatology and comorbidity of girls and boys with autism, and also to their typically developing male and female counterparts. We used registry data (2009-2017) on 1378 adolescents aged 12-18 years referred for urgent consultation to mobile psychiatric emergency services. This showed an increase in diagnoses of autism spectrum disorder from 7.9% in 2009 to 18.1% in 2016; autistic girls showed a steeper increase than autistic boys. A higher percentage of girls than boys with autism presented with comorbid anxiety disorders and a higher risk of suicide or self-harm, while the persistence of their complaints over time was rated lower. Adolescents with autism experienced more severe impairment in overall functioning, while being diagnosed less often with comorbid disorders as compared to typically developing adolescents. Outpatient care for autistic youth should include easy access to specialized professionals to help young people with autism cope with the challenges of adolescence.