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


Whenology website
USA-NPN's Spring Indices featured on new Whenology website

July 10, 2015

The USA-NPN's Gridded Spring Indices, developed in partnership with Cornell University using long-term lilac data from the National Phenology Database, are highlighted in the new website Whenology. The website uses dynamic visualizations to show how the timing of plant and animal phenology is changing. 

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Observers Needed

mayfly, Photo: Alan StankevitzTrack the emergence of mayflies this summer

Mayflies can emerge in the millions, numbers large enough to appear on weather radar! The US Fish & Wildlife Service is teaming up with Nature's Notebook to track the large-scale emergence of mayflies along the Upper Mississippi River this summer. Find our more about how you can join Mayfly Watch.

Find out more about Nature's Notebook »