Updated March 20, 2026, 8:22 a.m. ET
Spring is often seen as a time for renewal, with warmer weather, blooming flowers, and longer days. However, for many who deal with seasonal allergies, it can also mean itchy eyes, scratchy throats, runny noses, and plenty of sneezing.
This spring might be especially tough for about 106 million Americans battling allergies and/or asthma, as pollen is a significant cause of discomfort, according to the Asthma and Allergy Foundation of America.
A 2021 study found that the pollen seasons in North America have lengthened by, on average, 20 days between 1990 and 2018, largely due to climate change. Unfortunately, this news isn’t great for the roughly one in four adults and one in five children in the U.S. who experience seasonal allergies.
Where pollen counts are on the rise
If you’ve noticed that your pollen allergies seem worse lately, you might not be imagining it. Allergy symptoms are indeed lasting longer and hitting harder due to the extended pollen seasons that come with climate change, according to the Asthma and Allergy Foundation of America.
Pollen from trees, grass, and weeds is already starting to increase in the Western and Southern regions of the U.S.
Unable to view our graphics? Click here to reload.
Areas with anticipated increases in allergens
Warmer temperatures are predicted to lead to an earlier and more intense allergy season, with tree pollen moving north from southern regions and the Ohio Valley, as per AccuWeather’s 2026 allergy forecast. Pollen levels are elevated in over 29 states, and early spring storms are causing rapid spikes.
Effects of pollen on your body
Pollen is released by plants in spring to help pollinate others of the same kind. These tiny particles can easily be inhaled as they float in the air.
For some individuals, the immune system reacts strongly when pollen is inhaled, mistaking it for a threat. It produces antibodies, which release histamines into the bloodstream, causing symptoms like runny noses and itchy eyes.
Comparing symptoms: seasonal allergies, colds, and COVID-19:
U.S. cities known as ‘Allergy Capitals’
The Asthma and Allergy Foundation of America evaluates cities based on pollen levels, the availability of medications, and the number of certified allergists per capita in the 50 largest cities across the continental U.S. Here’s how they ranked:
More cities from the West made it onto the Allergy Capitals list for 2026 than in previous years, primarily due to increases in grass and weed pollen.
Ways to alleviate allergy symptoms
- Check pollen counts: Before you head outside, it’s smart to look at local news or visit the National Allergy Bureau for current readings.
- Treat symptoms early: Many allergy medications work best when taken before exposure. Consult your doctor about when to start treatment, as some recommend beginning about two weeks prior to the typical onset of symptoms.
- Use high-efficiency filters: These can help keep indoor air cleaner by capturing pollen and other allergens, especially if you use forced air systems.
- Keep windows closed: This helps prevent pollen from entering your home and vehicle – try using air conditioning instead.
This story was updated with new information as it became available.
