Longer Allergy Seasons Linked to Climate Change in U.S. Cities
Longer Allergy Seasons Linked to Climate Change in U.S. Cities
US · Published Nov 5, 2026
• A recent analysis highlights the impact of climate change on allergy seasons in the U.S., with longer freeze-free growing periods observed in several cities.
• According to Climate Crisis 247, the freeze-free season, defined as consecutive days with minimum temperatures above 32°F, has significantly increased in many locations since the 1970s.

Impact & Risks

Longer allergy seasons pose challenges for individuals with pollen allergies, as extended growing periods lead to increased pollen production. Regions like the Midwest, where ragweed is prevalent, are particularly affected. This trend could exacerbate health issues such as respiratory problems and allergic reactions, impacting quality of life and healthcare systems. Additionally, the data underscores the broader environmental consequences of climate change, emphasizing the need for adaptive measures to mitigate its effects.

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