With many parts of the United States having a mild winter, and after Punxsutawney Phil's prediction of an early spring, tree pollen allergy season is already on the rise. Spring pollen allergies are usually a result of pollen from trees, which can start pollinating anytime from January to April, depending on the climate and location. Trees that are known to cause severe allergies include oak, olive, elm, birch, ash, hickory, poplar, sycamore, maple, cypress and walnut. While some trees may release pollen to some degree in the fall, elm is the major tree known to pollinate mainly in the fall season. Whether you plan to take over-the-counter medicines, prescription medications or see an allergist -- if you suffer from seasonal allergy symptoms in the spring, now is the time to get ready to combat those symptoms.