Allergy & Pollen Forecast
What is blooming now, when your season starts and how today's air quality stacks on top. Pick your city for a local calendar tuned to your region.
Seasonal allergy calendar
Typical US pattern — southern states run 3-4 weeks earlier
|
JAN |
FEB |
MAR |
APR |
MAY |
JUN |
JUL |
AUG |
SEP |
OCT |
NOV |
DEC |
| Tree pollen |
|
|
|
|
|
|
|
|
|
|
|
|
| Grass pollen |
|
|
|
|
|
|
|
|
|
|
|
|
| Ragweed & weeds |
|
|
|
|
|
|
|
|
|
|
|
|
None
Low
Moderate
Peak
Outlined column = this month
How this works
The calendar reflects multi-year observations of North American pollen seasons: trees lead in spring, grasses take over in early summer, and ragweed dominates late summer into fall. Southern states start earlier and run longer; mountain and northern areas compress into a shorter window. Pair it with the live EPA air quality readings above — smoke, ozone and pollen add up.