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Pollen Seasons

Trees in Central Oklahoma trees begin pollinating from mid-September (mountain cedar from the Arbuckle Mountains) through early May (pecan) and late June (pine). There is a second elm season in the fall (late August to October) due to the introduction of lacebark elms and cedar elms to this area. Each of the common tree species (elm, oak, maple/box elder, pecan/hickory, birch, mulberry, juniper, sycamore, pine, cottonwood/poplar, willow) usually pollinate for only a few weeks but added together the season is quite long.

Grasses

Central Oklahoma has two grass seasons. Cool season grasses (blue, fescue, timothy, rye, orchard, and redtop) can begin as early as late February or March but after a month or two they stop pollinating totally. The warm season grasses (which do not cross-react with cool season grasses) such as Bermuda, Bahia, crabgrass, and Johnson begin when the weather becomes warm and do not always stop until a good hard freeze in November.

Weeds

Some weeds pollinate in late spring or summer (dock and plantain), but most begin in late summer and fall. Ragweed pollination begins based on hours of daylight and almost always begin when the days shorten around the middle of August. However, the weeds often continue to pollinate until there is a hard freeze, often in late November.

Molds

We find molds in Central Oklahoma every day of the year unless there is a very hard freeze and/or the ground is covered with snow.
The Oklahoma Allergy & Asthma Clinic is a certified counting station for pollen and mold. We are associated with the National Allergy Bureau and the AAAAI. You can find our counts on the internet at www.oklahomaallergy.com. We supply the local media (TV stations, newspaper and radio) with our counts every day they are done. To learn more about the National Allergy Bureau (NAB) you can go to www.aaaai.org.

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Very High Allergy Alert for Tree Pollen Continues

April 2, 2026

VERY HIGH RANGE: ALLERGY ALERT. COMBINED TREE POLLEN COUNTS ARE AT VERY HIGH LEVELS on Thursday, April 2nd, 2026

The alert is due to OAK pollen counts in the VERY HIGH RANGE and MULBERRY in the HIGH RANGE.  COMBINED TREE POLLEN counts are at the VERY HIGH ALERT level.  Multiple tree pollens detected today: Oak (VERY HIGH), Mulberry (HIGH), Cottonwood, Sycamore and Willow (MODERATE), Cedar, Ash, and Pine (LOW).

This is an extreme exposure situation.  Severe symptoms may be expected in pollen-sensitive individuals. More seriously allergic people should be advised to stay indoors as much as possible. This is especially true if someone has pollen sensitivity or allergic bronchial asthma.  

Spring tree pollen affects thousands of people across the Oklahoma region, triggering allergic rhinitis, commonly known as “hay fever”, as multiple tree species begin pollinating as the weather warms.  These pollen grains can be carried hundreds of miles due to windy conditions.

For More Information -

The best way to combat these allergens is to stay in filtered air. OAAC’s board-certified allergists recommend avoiding allergy triggers as the best way to reduce symptoms. These triggers include:

  • Limit outdoor activities during days with high pollen counts.
  • Keep windows closed (at home or in the car) to keep pollen out.
  • Don’t wear your outdoor work clothes in the house; they may have pollen on them.
  • Take a shower after coming indoors. Otherwise, pollen in your hair may bother you all night.
  • Leave shoes outside or just inside the door so that you don’t track pollen inside your home.
  • Wash your hands often. Pollen can stick to your hands when you touch something outside or a pet if it has been outside.
  • Wear a dust mask that people like carpenters use (found in hardware stores) when you need to do outdoor tasks such as raking leaves.
  • Clean and replace furnace and air conditioner filters often. Using HEPA (high efficiency particulate air) filters is recommended, which remove at least 99 percent of pollen, as well as animal dander, dust, and other particles.

Some other options include medications like nasal sprays and antihistamines, but it needs to be the correct medicine and should be used continuously throughout the season.

Seasonal allergies (allergic rhinitis, commonly known as “hay fever”) cannot be diagnosed by history alone. A board-certified allergist can diagnose allergies and determine the specific triggers that cause them through simple tests. The allergists at OAAC evaluate and manage patients of all ages from the southwest region.  The main clinic is on the Oklahoma University Health Sciences Center campus.  For patient convenience, satellite offices are located in Edmond, Norman, and northwest Oklahoma City.

For more information about allergic rhinitis (“hay fever”), visit: https://oklahomaallergy.com/services/allergic-rhinitis/

Daily Pollen Counts for Weed, Grass and Tree pollen, as well as Mold levels can be found at: https://oklahomaallergy.com/allergy-report/

Visit the OAAC website at www.oklahomaallergy.com to view the addresses for all Oklahoma Allergy and Asthma Clinic locations.  To make an initial appointment for an allergy, asthma, or immunology problem or to request more information, please call (405) 235-0040 or visit the website.

The post Very High Allergy Alert for Tree Pollen Continues appeared first on Oklahoma Allergy and Asthma Clinic.

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