Rates of migration continue to rise in the United States; between 1965 and 2015, new immigrants and their ancestors accounted for 55% of population growth. In Latin America, ongoing violence, extreme poverty, and political instability force many families to migrate north to the United States. Before, during, and after migration, immigrant children are at risk of being exposed to traumatic events which may lead to mental health issues and impact their school adjustment. Community-based programming, such as school-based support groups, may be particularly helpful in addressing these risk factors and fostering resilience. Support groups have been found helpful in improving school adjustment, which includes school achievement, engagement, and retention. However, there is a lack of high-quality, methodologically rigorous support group programming. In addition, few of these school-based support groups have been evaluated using a structured, systematic process like a program evaluation. To address this gap, the study partnered with a local elementary school to conduct a program evaluation of their pilot program, the Newcomer Support Group (NSG). The NSG is a school-based support group for Latinx immigrant elementary-aged children. The study aimed to explore the program evaluation experience for stakeholders and the NSG's impact on participating children. Results revealed that the program evaluation was, overall, collaborative and informative for stakeholders. However, the NSG did not have a significant impact on Latinx immigrant children's school adjustment. The study explores the results, contributions, and limitations (e.g., the COVID-19 pandemic) in more depth. It is critical that school systems offer targeted, supportive spaces for Latinx immigrant youth and that these programs be evaluated carefully to assess overall impact. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]