The extended ragweed pollen season poses significant health risks for allergy sufferers across the U.S. Symptoms include sneezing, itchy eyes, nasal congestion, and fatigue, which can disrupt daily life and sleep. Cities like Toledo, Ohio, and Reno, Nevada, have seen the most significant increases in freeze-free days, making them hotspots for prolonged allergy seasons. With 17 types of ragweed growing across the U.S., millions of people are at risk of experiencing worsened allergy symptoms, particularly in regions where the freeze-free season has lengthened by two weeks or more.