USA NPN National Phenology Network

Taking the Pulse of Our Planet

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The USA National Phenology Network

The USA National Phenology Network

We bring together citizen scientists, government agencies, non-profit groups, educators and students of all ages to monitor the impacts of climate change on plants and animals in the United States. Learn more about the USA-NPN

What is Phenology?

What is Phenology?

Phenology refers to key seasonal changes in plants and animals from year to year—such as flowering, emergence of insects and migration of birds—especially their timing and relationship with weather and climate.

Learn more about phenology

Nature's Notebook

Nature's Notebook

Join amateur and professional naturalists in regularly observing plants and animals to generate long-term data sets used for scientific discovery and decision-making.

Get started with Nature's Notebook

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USA National Phenology Network


Photo: National Academies of Sciences

USA-NPN Executive Director gives presentation at National Academies of Sciences Meeting 

November 30, 2016

USA-NPN Executive Director Jake Weltzin presented at the National Academies of Sciences, Engineering, and Medicine  Meeting which took place in Irvine, CA from November 29-30, 2016. Jake showcased the USA-NPN's suite of phenology maps that were made available in Spring of 2016.  

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Observers Needed

Phenophase PrimerNew Phenophase Primer helps observers to understand Nature's Notebook datasheets

The first section of the Phenophase Primer is now available for download. This beautifully illustrated guide provides detailed information on how to identify each of the phenophases we ask you to observe on the Nature's Notebook datasheets. Please note that this is a draft version; a final version with information about conifers and more photos will be released next year. Once all three sections are complete, we will offer a printed and bound copy, much like we do for the popular Botany Primer

Learn more about Nature's Notebook »