COLORADO SPRINGS, Colo. (KKTV) - If you’ve been hit hard by spring allergies lately, you’re not alone. Allergist with UCHealth, Dr. Levi Keller, says the unseasonably warm weather the past several weeks has led to a relatively early onset of spring allergens circulating. “A lack of winter, and I think we certainly have seen an early emergence of tree pollen, which is predominantly our springtime allergen,” Keller said.