Forests are complex ecosystems facing threats such as climate change and invasive pests. Climate change increases forest vulnerabilities through droughts and extreme weather, while invasive pests intensify these challenges. Traditional pest monitoring, once limited to experts, is being transformed by citizen science, engaging the public in research and monitoring. Projects like iNaturalist expand monitoring reach, enhance early pest detection, and foster environmental stewardship. Citizen scientists provide valuable data supporting rapid responses and collaboration with plant health specialists. Technologies like drones and environmental DNA empower volunteers and improve data accuracy. Despite limitations like species identification difficulties, comprehensive training and expert validation enhance data reliability. Case studies on tree health surveillance and Cerambyxcerdo management show citizen science's effectiveness in increasing surveillance and fostering community-based monitoring. Involving citizens in setting objectives and interpreting data creates impactful conservation outcomes. Integrating citizen and professional efforts ensures thorough monitoring and effective pest management, bridging the gap between research and practical conservation to promote sustainable forests. This article highlights the critical role of citizen science in forest health monitoring, emphasizing clear objectives, appropriate tools, and sustained public engagement. Keywords: Citizen Science, Forest health, Climate change, invasive pests.