Seasonal Allergy Calendar. Seasonal allergies, also known as hay fever or allergic rhinitis, are the immune system’s response to airborne substances, such as pollen or mold spores, that appear during. See which medicines you need in your allergy kit to help relieve symptoms.
Find out now with our free allergen calendar, showing peak allergy season for tree pollen, grass, ragweed, cedar fever, and household allergens. When does it start and end?