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Arthur T Knackerbracket has found the following story:

The start of spring isn't advancing at the same rate across the United States. In a recent study with climatologist Michael Crimmins, I evaluated changes in the arrival of springtime warmth over the past 70 years.

We found that in the Northeast, warmth associated with the leading edge of springtime activity has advanced by about six days over the past 70 years. In the Southwest, the advancement has been approximately 19 days. Spring is also arriving significantly earlier in the Southern Rockies and the Pacific Northwest. In contrast, in the Southeast the timing of spring has changed little.

Although the trend over decades toward earlier springs is clear, weather patterns unfolding across the continent can vary the start of the season dramatically from year to year at any one spot. The U.S. National Phenology Network produces maps that document the onset of biological activity over the course of the spring season.

The network also maintains a live map showing where spring has arrived. In some parts of the Southeast, spring 2020 has been the earliest in decades.

While numerous studies have documented clear changes in the timing of activity in certain plants and animals, scientists have little to no information on the cycles of most of the millions of species on Earth. Nor do they know the consequences of such changes yet.

One important way to fill knowledge gaps is documenting what's happening on the ground. The U.S. National Phenology Network runs a program called Nature's Notebook suited for people of nearly all ages and skill levels to track seasonal activity in plants and animals. Since the program's inception in 2009, participants have contributed more than 20 million records.

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