USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Status of Spring

Status of Spring

Spring leaf-out has arrived in all but highest-elevation areas of the Continental US and has started to arrive in Alaska. Spring was 1-3 weeks late in the SE, northern Great Plains, MW, and NE and 1-3 weeks early across the central Great Plains, Ohio Valley and mid-Atlantic. The west is a patchwork of early and late arrival.  

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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

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USA National Phenology Network


2017 Annual Report

2017 Annual Report now available

May 21, 2018

Learn about all that we accomplished together last year. Special highlights include how Nature's Notebook data were used in a study of mistletoe phenology and in Midway Atoll NWR's battle with invasives, and the ways the McDowell Sonoran Preserve is engaging volunteers to learn about phenology of local plants and animals. 

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 Celebrating 10 Years of the USA-NPN


This month we highlight the staff of the National Coordinating Office of the USA-NPN. Since the USA-NPN was established ten years ago, the NCO staff have worked to create phenology monitoring protocols, the Nature's Notebook phenology observation program, summarized data and data products, and a community for learning and sharing about phenology. The 12 current staff, most of whom have been with the NCO since the beginning of the USA-NPN, work closely with hundreds of partners and thousands of observers across the country to achieve the goals of collecting and sharing phenology data and information.

Learn more »