Allergy & Asthma Care Information - Pollen Allergies

Pollen allergies are a remarkable problem in Southern Oregon and Northern California.

The major seasons in Southwestern Oregon and Northern California are:

  1. Spring Tree Pollens: Mid February - Mid May | Major pollen producing trees include Ash, Alder, Birch, Oak, Boxelder, Maple, Cottonwood, Juniper, Sycamore, Mulberry, and Walnut. Tree pollens can settle into yards and windows, but also are blown for miles in the wind.
  2. Early Summer Grass Pollens: Mid May - Mid July | All grasses on lawns, fields and hillsides can cause allergies such as Blue Grass, Timothy, Rye, Fescue, Orchard Grass and other "Northern Pasture Grasses." Bermuda Grass is more common in southern climates, but some native species may occur in Oregon. Tall grasses (not cut grass) release very large amounts of pollen on windy mornings, afternoons and as morning dew dries out. This is the most severe pollen season in Oregon. Mowing lawns, exposure to hay or tall grass, camping out and using a weed eater could cause marked symptoms in grass allergic individuals. Sleeping with windows open lets pollen blow into the home and build up as dust in bedding and carpets. Use air conditioning, keep bedroom windows closed, avoid fields and pastures and drive with windows closed to help reduce exposure.
  3. Fall Weed Pollens: Mid August - Mid October | Some weeds pollinate as early as June. Pollen counts in the Rogue Valley are fairly low during this pollen season. Much higher exposure is found in the Klamath Basin where sagebrush, rabbitbush, ragweed, as well as ever present pigweed, plantain, marshelder, etc., cause lots of Fall allergies.

If you would like additional detailed information on Pollen Allergies, contact us and make an appointment at our clinic.



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Located in Medford, Oregon with satellite offices in Grants Pass, Ashland, and Klamath Falls, the Allergy and Asthma Center of Southern Oregon, PC offers exceptional care for patients with allergies and asthma.

Allergy & Asthma Information

Please feel free to explore our site as you will find information on allergy and astma care including information about pollen allergies, food allergies, immunotherapy, atopic dermatitis, hives, and poison oak and more.

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