The USA National Phenology Network was established in 2007 to formalize standardized phenology monitoring across the country. The aims of the Network are to collect, store, and share phenology data and information to support scientific discovery, decision-making, an appreciation for phenology, and equitable engagement within the Network. To support these aims, the Network launched Nature’s Notebook, a rigorous platform for monitoring plant and animal phenology, in 2009. Since the launch of Nature’s Notebook, participants across the country have contributed over 28M phenology records. Participants range from backyard observers with an interest in nature to researchers and natural resource managers asking specific questions. We survey the breadth of studies and applied decisions that have utilized Nature’s Notebook and the consequent data. The dimensionality of the dataset maintained by the Network is a function of Nature’s Notebook users; this insight is key to shaping the Network’s future data collection activities.