When is Allergy Season in Pennsylvania?

August 11, 2023

Allergies make people miserable, but they can vary based on the season. Tree, grass, and weed allergies cause problems in spring through fall, while indoor allergens like pet dander or mold cause symptoms year-round.

The spring allergy season in Pennsylvania usually begins in late February or early March and lasts until a hard freeze in winter. Warm weather and rainfall aid plant growth, which in turn leads to high pollen levels. Showers may offer some allergy patients a break – moisture weighs down pollen, keeping it on the ground where it can’t be inhaled.

During the spring, tree pollen is at its highest concentration, especially oak, elm, birch, poplar and cedar trees. Grass pollen is at its peak in late spring and early summer, with northern grasses like timothy or brome being the worst. During this time, dry and breezy conditions are perfect for pollen to move, which can lead to increased allergy symptoms.

In the late summer and into autumn, ragweed-fueled allergies are at their peak. If you are susceptible to this type of allergy, be sure to use your meds and stay inside as much as possible during these months. As always, cleaning your home more often and taking precautions to keep outdoor pollen levels low can help limit your symptoms. As a bonus, a humid climate also helps keep pollen counts down. If you notice your symptoms increasing, talk to your doctor about an allergy shot or other medication.


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