Introducing the Thermal Calendars tool
Temperature is an important factor governing when seasonal events happen in many plant and animal species. For many species, events like leaf-out, flowering, and egg hatch are triggered when a specific amount of heat has accumulated since the start of the year. We typically measure accu... Read more
Nature’s Notebook observations reveal clear changes in New Jersey
Global temperatures are increasing and the impacts are numerous and wide ranging. Temperatures have been rising at a particularly fast rate in the northeastern U.S., including many densely populated areas like New Jersey. To document environmental changes and better understand the impac... Read more
Phenology Week! March 16-20, 2026
March 16-20, 2026 is Phenology Week - a virtual celebration of the seasonal cycles of plants and animals. The purpose of Phenology Week is to celebrate YOU, our Nature's Notebook observers, Local Phenology Programs, and partners! Read more
Download Nature's Notebook
Track seasonal changes in plants and animals throughout the year with Nature's Notebook.
To get started, download our Nature's Notebook app for Android or iPhone, or set up your account online.
