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

Phenology and Climate Change

Phenology and Climate Change

The ways in which the world is responding to climate change are not well understood. Phenology is a great indicator of current and future climate impacts on people, plants, animals and our natural areas.

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
Researchers develop new method to evaluate citizen science data

November 16, 2015

Researchers at the University of Twente in the Netherlands have described a new workflow to identify inconsistencies in data collected by volunteers. The method, published in PLoS ONE, will increase the usability of these data. 

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Observers Needed

Nature's Notebook tree 1.5 million recordsNature's Notebook observers collect over 1.5 million records in 2015

As of November 6, Nature's Notebook observers contributed over 1.5 million records to the National Phenology Database in 2015 alone. The Database contains more then 6 million records. 

Find out more about Nature's Notebook »