The University of Tulsa

Aerobiology Lab


Mountain cedar or Ashe juniper (Juniperus ashei) pollen is one of the most potent allergens in the United States. Populations of mountain cedar (also called ashe juniper) occur in south central Oklahoma and Texas (Distribution map). Although none occur within 200 miles of Tulsa, my lab has presented evidence for significant concentrations of mountain cedar pollen being carried to Tulsa by prevailing southerly winds. Research in my lab has also focused on the identification of the specific allergenic proteins in mountain cedar pollen and related species of conifers.

In addition to being very allergenic mountain cedar pollen is also unique due to the time of pollen release. Pollination occurs during December and January often with the peak occurring the last week of December. The pollen is responsible for a mid-winter hay fever problem that is called "cedar fever" in central Texas. Plants produce abundant pollen that is easily dispersed by wind as the photo below shows. 

Mountain cedar trees in the Arbuckle Mts. of south-central Oklahoma releasing pollen.

Past Years

2014-2015 Season

2013-2014 Season

2012-2013 Season

2011-2012 Season

2010-2011 Season

2009-2010 Season

2008-2009 Season

2007-2008 Season

2006-2007 Season

2005-2006 Season

2004-2005 Season

2003-2004 Season

2002-2003 Season

2001-2002 Season

2000-2001 Season

1999-2000 Season

1998-1999 Season

Project Staff

Cedar Fever

Links to Allergy Information

Glossary of Terms

Tulsa Pollen Home Page

Links to Current Pollen Counts for Your Area

Monthly Pollen Calendar

Links to Weather Information

How to Read the Forecasts


Questions: E-mail to the Aerobiology Lab at The University of Tulsa: pollen@utulsa.edu


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