Understanding the impact of technological advancements, such as ICT, on the climate change adaptation actions of smallholder farmers is crucial for comprehending their adaptive strategies. This study utilizes data from a survey of 2230 smallholder farmer households in the developed rural region of the Yangtze River Delta in China to examine the factors influencing their perceived self-efficacy and actions to adapt to climate change. Using binary logit regression and OLS models, we identify the role that determinants of ICT use play in shaping smallholders' perceived self-efficacy and adaptive action. Our findings corroborate that perceived self-efficacy is a robust, positive predictor of adaptive action. The data indicate that the sole presence of adaptation leaders predominantly enhances perceived self-efficacy. In contrast, adaptive investments at the village level are primarily associated with an increase in adaptive actions. However, peer effects may diminish smallholder perceived self-efficacy and adaptive action. In addition, our study indicates that while ICT has not currently supplanted traditional social networks in influencing smallholder climate change adaptation perceived self-efficacy and adaptive action, we cannot dismiss the potential substitution effect. We also clarify why the peer effects of traditional networks have starkly contrasting impacts in developed and less-developed rural regions in China. Overall, our findings underscore the importance of incorporating objective influencing factors of smallholder adaptation actions and their effects on subjective perceived self-efficacy into future climate change adaptation plans and policies to foster adaptation actions.