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Why Does Allergy Season Seem So Long This Year?
If allergy season feels like it’s dragging on longer than usual, you’re not imagining it. Across the U.S., seasonal allergies are starting earlier, lasting longer, and hitting harder, and 2026 is already following that trend. In some regions, symptoms began appearing as early as late February, with patients in warmer states like California and Arizona already reporting flare-ups well before the traditional spring peak.
This shift isn’t random. It’s part of a broader pattern driven by climate change, which is quietly reshaping how, and when, our bodies react to the environment around us.
How Climate Change Is Driving Longer Allergy Seasons
Warmer temperatures are one of the biggest contributors to prolonged allergy seasons. As winters become milder and spring arrives earlier, plants begin pollinating sooner than they did in the past. At the same time, the overall growing season is extending, meaning pollen remains in the air for longer.
But timing is only part of the issue. Rising carbon dioxide (CO2) levels are also playing a significant role. Plants rely on CO2 for growth, and as levels increase, they don’t just grow faster—they produce more pollen. In effect, many plants are becoming what experts call “super pollinators,” releasing higher concentrations of allergens into the air.
The result is a “double impact”: not only are allergy seasons longer, but they are also more intense. For those prone to allergies or asthma, this can translate to more persistent and more severe symptoms year after year.
Why Symptoms Are More Severe Than Before
With increased pollen production and extended exposure, the body’s immune response can become more reactive. Even individuals who previously experienced mild seasonal symptoms may notice stronger reactions, including congestion, itchy eyes, and respiratory discomfort.
Additionally, fluctuating weather patterns, such as unexpected warm spells followed by cold snaps, can further disrupt plant cycles, leading to unpredictable pollen surges. These shifts make it more difficult for allergy sufferers to anticipate and manage their symptoms effectively
How to Stay Ahead of Allergy Season
While you can’t control environmental changes, you can take proactive steps to minimize their impact:
Start treatment early
Don’t wait until symptoms peak. Beginning antihistamines or other allergy medications at the first sign of the season—or even slightly before—can help prevent symptoms from escalating.
Choose longer-lasting relief
24-hour antihistamines are often more effective for sustained symptom control compared to shorter-acting options. For those who experience side effects, nasal antihistamine sprays or steroid sprays can provide targeted relief.
Limit indoor pollen exposure
Simple habits can make a meaningful difference. Keep windows closed overnight, especially during peak pollen hours in the early morning, and use air conditioning when possible.
Reduce pollen buildup at home
Pollen can cling to clothing, hair, and skin. Changing clothes and showering after spending time outdoors can help prevent it from spreading throughout your living space.
Address compounding triggers
Nonseasonal allergens such as dust mites and pet dander can worsen symptoms. Regular cleaning, frequent washing of bedding, and using HEPA air filtration systems can help create a more controlled indoor environment.
The Bottom Line
Allergy season is no longer confined to a predictable window in the spring: it’s evolving alongside our climate. With earlier starts, longer durations, and higher pollen levels, today’s allergy seasons require a more proactive and informed approach.
Understanding the connection between climate change and respiratory health is the first step. From there, early intervention and consistent prevention can make all the difference in staying comfortable, healthy, and symptom-free, no matter how long the season lasts.
For more information, visit Purvi Parikh, MD, FACP, FACAAI's social media:
