Boise, Idaho Named Worst Allergy City in U.S.

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According to a new report from the Asthma and Allergy Foundation of America, Boise, Idaho has been named the worst city in the U.S. for allergy sufferers. The ranking is based on factors like early tree pollen, extended grass and weed pollen seasons, and a shortage of allergy specialists in the area.

Why it matters

This news is significant for Boise residents who deal with seasonal allergies, as it indicates they may face an especially challenging allergy season this year. The report highlights how climate and environmental factors can impact allergy severity, and the importance of access to allergy treatment resources.

The details

The Asthma and Allergy Foundation of America evaluated pollen counts, over-the-counter allergy medication sales, and the number of allergists in the 100 largest U.S. cities to determine the 'Allergy Capitals' ranking. Boise jumped from #95 on the previous list to #1 this year, due to factors like an early tree pollen season, longer grass and weed pollen seasons, and significantly more high pollen count days. The report also noted a shortage of allergy specialists available in the Boise area.

• The 2026 ranking is based on 2025 pollen data.
• Tree pollen peaked earlier than normal in Boise.
• Grass pollen season started and lasted longer than usual.
• Weed pollen season also lasted longer and peaked higher.