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


Start of Spring 2016

Explore new phenology maps on the USA-NPN Visualization Tool

May 9, 2016

You can now explore the USA-NPN's maps of accumulated temperature and start of spring in the Phenology Visualization Tool. 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 see how Nature's Notebook data compare to the date of first leaf or first bloom as estimated using the Extended Spring Indices. Learn more about these new maps or see them on the Visualization Tool

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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 »