The pollen count of mountain cedar can be found on the University of Tulsa's website. The University of Tulsa's aerobiology lab tracks the movement of the pollen by the prevailing winds.
The pollen from these trees, also called Ashe juniper, is one of the strongest allergens in the United States. While mountain cedar trees grow primarily in south central Oklahoma and Texas, pollen has been seen as far north as Tulsa. Pollination takes place annually in December and January, peaking in the last week of December. People with pollen allergies show seasonal allergic rhinitis, which affects the nose, eyes, throat, ears, skin and roof of the mouth.