USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Status of Spring

Status of Spring

This year, spring leaf-out was 1-3 weeks late in the SE, northern Great Plains, MW, and NE and 1-3 weeks early across the central Great Plains 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


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Changes in spring onset in national wildlife refuges and migratory flyways

September 12, 2018

We know that the timing of spring is changing. What does that mean for migratory birds? A new study from USA-NPN and USGS researchers published in PLOS One finds that in recent decades, spring is arriving extremely early in half of national wildlife refuges. These changes are not consistent across migratory flyways, with spring advancing significantly earlier in the north for most flyways. Explore the findings on our USFWS Phenology Network website.

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Celebrating 10 Years of the USA-NPN

Marjorie Johnson, who has observed for 10 years

This month we highlight the long-term observers who have participated in Nature's Notebook in each of the last 10 years! There are 30 observers who have reached this milestone so far, including Marjorie Johnson. She keeps careful phenology records of forsythia, dogwood, and red oak, and also notes animals she sees in her yard such as white-tailed deer. Through her many years of observations, she has noticed small details about her plants that she never knew before, such as that a late fall flowering of her forsythia means fewer blooms the following spring. 

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