When is allergy season in my state?

It depends on where you live. Tree pollen starts as early as December in Texas (cedar) and the Southeast, peaks in March through May across most states, then grass takes over from May through July. Ragweed runs August through the first hard frost. Each state page has a twelve-month calendar showing exactly which months run worst there.

Which month is worst for pollen?

April and May are the worst months in most states, when tree pollen peaks and grass season begins. Southern states often peak earlier: cedar pushes Texas into December and January, and oak drives Florida in March. Every state page names its worst and best months.

Where does the pollen data come from?

Live city readings come from WeatherAPI and update daily, covering tree species like oak and birch, grass, and weeds like ragweed. The monthly calendars come from seasonal profiles built for each state, so you can see typical levels for any month of the year.

Pollen and Allergy Seasons by State

Month-by-month pollen calendars for all 50 states plus DC, with live levels for cities in each.

Allergy season doesn't follow the calendar the same way everywhere. Cedar hits Texas in December, oak drives the Southeast in March, and birch keeps the Upper Midwest sneezing into May. Pick your state below to see its twelve-month pollen calendar, the species behind each peak, and today's levels for cities across the state.

Browse pollen seasons by state

What's on each state page

A twelve-month pollen calendar showing typical severity for every month, from None to Very High
The worst and best months of the year, plus the dominant species right now
Species detail for the current month — oak, birch, grass, ragweed, and more
Live city levels updated daily, with a link to each city's full pollen forecast

City pages go deeper: a 5-day forecast, air quality, weather, and day-over-day changes. Start from your state, then click through to your city.

More ways to plan your day

Check today's pollen count for your ZIP code
See air quality by state — pollution is a separate number from pollen
Today's worst pollen cities ranked nationwide
Find an allergist when over-the-counter meds stop working
Read our allergy guides on symptoms, seasons, and relief

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