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.

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USA National Phenology Network


AGDD Map video demo

Video demos help you explore the new Phenology Maps

June 21, 2016

The USA-NPN's new Phenology Maps allow you to see how much heat has accumulated in particular regions of the US, find out how this year's spring stacks up to previous years, and more! Now you can view video tutorials to help you explore the maps of growing degree days and the Spring Indices

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Observers Needed

Citizen Science DayBotany Primer provides a guide to understanding botany for Nature's Notebook

This beautifully illustrated guide provides detailed information on stems, buds, roots, leaves, flowers and fruits to help you make your Nature's Notebook observations. Download a free copy of the Primer, or purchase a spiral-bound copy. 

Learn more about Nature's Notebook »