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.

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USA National Phenology Network


white oak leaves, Photo credit: Dudley R. Hartel
Article in City Trees highlights phenology as a tool for City Foresters 

March, 2014

Authors Theresa Crimmins and Dudley Hartel discuss how city foresters can use Nature's Notebook to inform when to schedule management activities, identify problems in early stages, support reserach, and engage others.

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Observers Needed

flowering dogwoodJoin a Nature's Notebook Campaign This Spring

By participating in one of our regional campaigns you can help researchers answer key questions, get info-rich emails with localized results, and an end of season summary. Catch the greenwave, become a flower follower, or track the timing of trees with PopClock.

Find out more »