AXIOS March 5, 2025
Alex Fitzpatrick

Most major U.S. cities are suffering from longer allergy seasons amid human-caused climate change, a new analysis finds.

Why it matters: Millions of Americans endure runny noses, itchy throats, and worse health effects each spring allergy season.

Driving the news: The freeze-free growing season lengthened between 1970 and 2024 in nearly 90% of the 198 cities analyzed by Climate Central, a research and communications group.

  • Among those cities, the freeze-free season lengthened by 20 days on average.

How it works: Climate Central uses the freeze-free period — the number of consecutive days with minimum temperatures above 32°F — as a proxy for allergy season.

  • Above-freezing temperatures allow for better plant growth, and thus the release of more...

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Topics: Govt Agencies, Healthcare System, Patient / Consumer, Provider, Public Health / COVID
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