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Browse all guides →A pollen count measures the concentration of pollen grains in the air, typically reported in grains per cubic meter over a 24-hour period. It tracks three main types - tree pollen, grass pollen, and weed pollen - since each affects allergy sufferers differently. Higher counts mean more pollen in the air and potentially more severe allergy symptoms.
Pollen levels are generally categorized into four tiers: Low (1-20), Moderate (21-90), High (91-150), and Very High (above 150). At High or Very High levels, most people with pollen allergies will experience symptoms. On those days, it's worth limiting outdoor time, keeping windows closed, and taking any prescribed allergy medication before heading outside.
Pollen counts are typically lowest in the late afternoon and evening - usually between 5 PM and 10 PM. Counts peak in the morning, especially between 5 AM and 10 AM, when plants release most of their pollen. If you need to spend time outdoors on a high-pollen day, late afternoon is generally the safest window. Rain also temporarily clears pollen from the air, making post-rain periods a good time for outdoor activity.
Pollen season varies by type. Tree pollen season runs roughly February through May, peaking in March and April - this is when spring allergy symptoms are worst for most people. Grass pollen season follows in May through July. Weed pollen (especially ragweed) peaks in August through October. In warmer climates like the South and Southwest, pollen seasons start earlier and last longer. Some areas have pollen activity year-round.
Enter your city or ZIP code in the search field above to see today's pollen count. To get a free daily email alert when pollen is high in your area, enter your email on your city's page. We'll send you a heads-up on days when tree, grass, or weed pollen reaches High or Very High levels - so you can plan ahead.