Climate Change Is Intensifying Allergy Seasons: What You Need to Know

How Climate Change Fuels Worse Allergies

If you've noticed your seasonal allergies starting earlier, lasting longer, or feeling more intense, you're not alone. A growing body of research from scientists and physicians worldwide confirms that climate change is a key driver behind these worsening symptoms. According to Paul Beggs, an environmental health scientist at Macquarie University in Sydney, Australia, and author of a 2024 paper on climate and asthma, “We know that climate change is leading to greater amounts of pollen in the atmosphere. It's changing the seasonality of the pollen. It's changing the types of pollen that we're exposed to.”

What the 2026 Allergy Forecast Reveals

Pollen season is already underway across much of the United States, and the AccuWeather 2026 US Allergy Forecast paints a challenging picture: more high-pollen days are expected this year, driven by variables like storms and temperature swings. AccuWeather climate expert and senior meteorologist Brett Anderson explains, “The data is clear, and millions of seasonal allergy sufferers have noticed the changes. The seasonal allergy season in America is expanding at both ends.”

Why Allergy Seasons Are Growing Longer

Dr. Rebecca Saff, an allergist and immunologist at Massachusetts General Hospital in Boston, notes that the days when allergies were confined to spring or fall are long gone. As global warming creates shorter, milder winters and warmer springs, those allergy seasons start earlier and continue later. A 2022 study in the journal Nature predicts that by the end of the century, pollen season could begin 40 days earlier and end 15 days later than historical averages.

Anderson adds, “Later frost dates mean the allergy season is ending later in many places. When warmth and moisture align, trees, grass, and weeds can produce more pollen more often.”

Plants on the Move: New Allergens Appear

Warmer temperatures are also causing some plants to migrate northward. Dr. Saff points to ragweed as a prime example: it's now appearing in regions like the Northeast, where it previously wasn't a significant problem. This shift introduces new allergens to populations that have never dealt with them before, catching many by surprise.

Extreme Allergy Events on the Rise

Rising global temperatures—the World Meteorological Organization (WMO) reports that the past 11 years have been the 11 warmest on record—are triggering what experts describe as alarming extreme allergy events. These episodes, characterized by sudden, intense pollen spikes, can overwhelm even those who typically manage their allergies well.

What This Means for You

Currently, the Centers for Disease Control and Prevention (CDC) estimates that 30% of Americans over age 18 have seasonal allergies. Thanks to climate change, these individuals may now experience symptoms—such as watery eyes, sneezing, and coughing—for longer stretches each year. The combination of extended seasons, new allergens, and more extreme events means that managing allergies has become a year-round challenge for many.

Tips for Surviving the New Normal

• Monitor daily pollen counts in your area using apps or weather reports.
• Keep windows closed during high-pollen days and use air purifiers indoors.
• Shower and change clothes after spending time outdoors to remove pollen.
• Consult an allergist to update your treatment plan, which may include antihistamines, nasal sprays, or immunotherapy.

By understanding how climate change reshapes allergy patterns, you can take proactive steps to protect your health. The trend is clear: allergy seasons are intensifying, but with preparation and awareness, you can still breathe easier.