If it seems like your seasonal allergies start a little earlier every year, it’s not all in your head. North Carolina is seeing a longer allergy season as a result of climate change, according to a new report from Climate Central.
Raleigh’s allergy season has lengthened by 41 days — more than a month — between 1970 and 2025, according to the analysis published March 4.
The increase of 41 days is nearly twice the national average growth of 21 days since 1970. The average increase across the Southeast was 19 days.
It’s a problem across the country. The freeze-free growing season became longer in 87%, or 173, of the 198 U.S. cities examined in the report.
Each climate region in the country has seen its freeze-free growing season lengthen, according to the analysis.
Kristy Dahl, vice president for science at Climate Central, said a longer allergy season indicates carbon pollution and a warming world.
“As temperatures rise, freeze-free seasons are stretching in every region of the country, giving plants weeks of extra time to grow and release pollen,” she said in a statement. “For millions of Americans, that means earlier, longer, and often more intense allergy seasons that can take a real toll on health and daily life.”
Pollen from trees is already at a moderate level in Raleigh this week, according to the North Carolina Department of Environmental Quality. Other types of pollen, like from grasses and weeds, are still at low levels, but they’re expected to increase, too, as the weather gets warmer.
The Asthma and Allergy Foundation of America ranked Raleigh as the seventh most challenging place to live in the U.S. with pollen allergies in its 2026 report, the same placement as the previous year.
The placements are based on pollen scores for tree, grass and weed pollen, over-the-counter allergy medication use and the number of allergy specialists, according to the study.
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