USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Status of Spring

Status of Spring

Spring was early across much of the US in 2017, arriving 2-3 weeks earlier than a long-term average in the South, Great Basin, Great Plains, Midwest and mid-Atlantic. Many parts of west coast states and small portions of the east coast were 1-3 weeks late.

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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


Spring Leaf Index Alaska May 29 2017

Spring Index and Accumulated Growing Degree Day maps now available for Alaska

May 30, 2017

You can now explore gridded maps of the Spring Indices and Accumulated Growing Degree Days for Alaska on the USA-NPN Visualization Tool. Spring arrived in coastal areas of the southern part of Alaska in April, and is moving north across the state. 

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Observers Needed

Bat feeding at flowerFlowers for Bats seeking Arizona observers

If you live in Southeastern Arizona, you can help the US Fish & Wildlife Service document flowering of agave and saguaro cactus during the spring and summer flowering periods, an effort called Flowers for Bats. This information will be used by the FWS to conserve and promote habitat for lesser long-nosed bats. Observers in other areas can visit the Nature's Notebook campaigns page to find out how to participate in other campaigns.

              Learn more about Nature's Notebook »