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Tree Pollen Count

Spring Season Guide by Tree Type & Region

What Is the Tree Pollen Count?

The tree pollen count is the first major allergen of the year, starting as early as January in the South and running through June in northern states. Oak, birch, cedar, and alder are the biggest triggers.

Peak season: January through June, varying by region and tree type

Most affected regions: Southeast, South, Pacific Northwest, Northeast

Common symptoms: Sneezing, itchy watery eyes, runny nose, scratchy throat.

Tips for High Tree Pollen Count Days
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Worst Trees
Oak, birch, and mountain cedar produce the highest volumes of allergenic pollen in the US.
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Regional Variation
Cedar blooms in Texas from Nov–Feb. Alder peaks in the Pacific Northwest Feb–Apr. Birch and oak peak Apr–May in the Northeast.
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Warm Weather = More Pollen
A warm spring accelerates tree blooming and can compress the entire season into just a few intense weeks.
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Exercise Timing
Tree pollen peaks in the morning. Schedule runs and outdoor workouts for the late afternoon.
Check Tree Pollen Count by City
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Frequently Asked Questions

What is considered a high tree pollen count?

A tree pollen count above 90 grains per cubic meter is considered high. Oak trees alone can produce counts above 1,500 on peak spring days.

Which trees cause the worst allergies?

The most allergenic trees in the US are oak, mountain cedar (juniper), birch, alder, maple, and mulberry. Oak is the most widespread allergen due to its range across the eastern US.

When does tree pollen season end?

Tree pollen season typically ends by late May or June in most US cities, though some overlap with the start of grass pollen season. In southern states, tree pollen can begin as early as January.