Tree rings serve as invaluable archives of past climate conditions, offering insights into long-term climate patterns and variations. However, traditional tree-ring width indicators may not always provide a complete picture, especially in regions where trees experience optimal growth conditions. In such areas, alternative indicators like tree-ring blue intensity have gained prominence in dendroclimatology research. However, research on tree-ring blue intensity in subtropical regions remains significantly lacking. This study delves into the application potential of tree-ring blue intensity in subtropical regions of China, focusing on the Shennongjia region. By utilizing a comprehensive dataset including tree-ring width, earlywood blue intensity, latewood blue intensity, delta blue intensity, and meteorological data from the Badong weather station, the research aims to enhance our understanding of climate signals embedded within tree rings. Employing dendroclimatological methods, the study scrutinizes the correlations between various tree-ring indicators and key climate variables such as monthly precipitation, monthly mean minimum temperature, monthly mean temperature, and monthly mean maximum temperature. By comparing the effectiveness of different indicators in capturing climate signals, the research sheds light on the suitability of tree-ring blue intensity as a proxy for past climate conditions in subtropical regions. The findings reveal that tree-ring blue intensity in the Shennongjia region encompasses a more diverse array of climate signals compared to traditional tree-ring width. Notably, latewood blue intensity and delta blue intensity emerge as robust indicators of variations in August temperature. The study elucidates the close relationship between these indicators and August temperature, with delta blue intensity showing a particularly strong correlation. Furthermore, the discovery of consistent high-frequency signals between tree-ring blue intensity and temperature enhances dendroclimatology research in regions characterized by favorable tree growth conditions. This advancement provides a solid foundation for reconstructing historical temperature variations. In conclusion, this study underscores the significance of tree-ring blue intensity as a valuable tool in dendroclimatology research, particularly in subtropical regions. By elucidating the intricate relationship between tree rings and climate variables, the research contributes to broader efforts aimed at understanding the impacts of climate change. The insights gained from this study can inform not only scientific research but also policy-making and adaptive management strategies in subtropical regions facing climate challenges. Moreover, the utilization of tree-ring blue intensity as a proxy for past climate conditions holds promise for enhancing our understanding of ecosystem responses to climate change in subtropical regions. By deciphering the complex interactions between tree growth dynamics and climatic variables, researchers can elucidate the mechanisms underlying ecosystem resilience or vulnerability to changing environmental conditions. This deeper understanding is essential for devising effective strategies for conserving biodiversity and mitigating the impacts of climate change on both natural and human systems.