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 the Continental US and most of 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.  

See the maps

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


AGU Fall meeting 2018

Join us at AGU for a special session hosted by USA-NPN

June 21, 2018

Submit an abstract to the session The USA National Phenology Network: Advancing the Science of Phenology in the Past, Present and Future and highlight your work that utilizes USA-NPN data, tools, or resources. Abstracts are due August 1st.

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Celebrating 10 Years of the USA-NPN

Pheno Forecast map showing where to treat emerald ash borer May 8 2018

This month we highlight the data and data products managed by the USA-NPN that are used by researchers, managers, educators, meteorologists, gardeners, and other members of the public. Read the results of published research that includes data from the National Phenology Database on our Peer-Reviewed Results page. Explore the data yourself via our Visualization Tool and Phenology Observation Portal. See the Status of Spring maps that provide forecasts of when spring leaf out and bloom will arrive and how this year stacks up to a long-term average. Find out whether pests are treatable in your area with our Pheno Forecasts

Learn more »