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: Brian F Powell

New study shows spring is happening earlier in three of every four National Parks 

October 6, 2016

The USA-NPN is part of a new study published in Ecosphere that shows spring is advancing in 75% of 276 National Parks studied. This shift is "extreme" in half of the Parks. The study used the Spring Indices, an index of spring developed by the USA-NPN and its partners. Secretary Jewell announced the study at Shenandoah National Park, and an Arizona-focused article appeared in UANews.  

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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 »