What people tend to be allergic to outside lately in the SF bay area

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In the San Francisco area, people are typically allergic to tree pollen (like oak, cedar, pine, and olive), grass pollen (rye, bluegrass), and weed pollen (ragweed, sagebrush), with each season having different dominant allergens. The allergy season often starts in January with trees and continues with grasses in spring and weeds in late summer and fall.  

Seasonal Allergen Breakdown

• Winter (January/February):

Allergy symptoms may decrease, but early-season tree pollen can still affect some individuals. 

Tree pollens from species like oak, birch, and cedar are common, followed by increasing amounts of grass pollen from varieties such as rye and bluegrass. 

Grass pollens, especially from rye and bluegrass, are at their highest, with some weed pollens starting to emerge in late spring and summer. 

Weed pollen, particularly from ragweed, pigweed, and sagebrush, becomes a major trigger for allergy sufferers. 

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Key Takeaways

• Year-round allergens:

  The Bay Area's climate can create extended or overlapping pollen seasons, making it feel like an almost year-round allergy problem for some. 

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Spring (March-May):

Summer (June-August):

Fall (August/September):

Common culprits:

Oak, pine, and cedar trees are common in the area and release significant pollen. 

Specific grasses:

Rye and bluegrass are prevalent grass species in the region that can cause allergies. 

Fall weeds:

Ragweed and other weeds, such as pigweed, become significant allergens in late summer and fall. 

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