Intellipure's Seasonal Allergen Report

Allergies Made Simple

Explore everything you need to stay ahead of seasonal allergens. Use the links below to learn about top allergens, see which ones peak each season, find practical relief tips, stay updated with allergy news, and access trusted resources and blogs. This guide helps you manage symptoms and breathe easier all year.

Allergens by Season Allergy Relief Tips Allergy News Allergy Resources Breathe Easy Blog

Top Allergens to Know

Click on any allergen to learn more

Ragweed
Tree Pollen
Grass Pollen
Dust Mites
Mold Spores
Animal Dander
Cockroach Allergens
Ragweed

Ragweed

Ragweed is a common weed that releases large amounts of pollen in late summer and early fall. It is widespread across North America, particularly in the Midwest and Eastern U.S. Exposure to ragweed pollen can trigger sneezing, itchy and watery eyes, a runny nose, and can worsen asthma symptoms.
Ragweed Guide
Tree Pollen

Tree Pollen

Tree pollen comes from trees such as oak, birch, maple, and cedar. It peaks in the spring and varies depending on your region. Common symptoms include congestion, sneezing, itchy throat, and watery, irritated eyes. Tree pollen is often the first seasonal allergen many people experience each year.
Learn More About Tree Pollen Allergies
Grass Pollen

Grass Pollen

Grass pollen, from grasses like timothy, Bermuda, and ryegrass, is most active in late spring through early summer. It is widespread across the U.S. Exposure can cause a runny or itchy nose, sinus pressure, itchy or watery eyes, and general respiratory discomfort for allergy sufferers.
Learn More About Grass Pollen Allergies
Dust Mites

Dust Mites

Dust mites are tiny microscopic creatures that live in bedding, carpets, upholstery, and other indoor surfaces. They are present in homes worldwide and thrive in warm, humid environments. Dust mites trigger sneezing, nasal congestion, and can exacerbate asthma and other respiratory conditions.
Learn More About Dust Mites
Mold Spores

Mold Spores

Mold spores are fungal particles that are found both indoors and outdoors, especially in damp or humid areas. Common indoor sources include bathrooms, basements, and any area with water damage, while outdoors they thrive in soil and on fallen leaves. Exposure can lead to coughing, nasal congestion, eye irritation, and general allergy symptoms.
Learn More About Mold
Animal Dander

Animal Dander

Animal dander consists of tiny skin flakes shed by cats, dogs, and other furry pets. It is found in homes where pets live and lingers in carpets, furniture, and bedding. Dander can cause sneezing, itchy or watery eyes, and can trigger asthma attacks in sensitive individuals.
Learn More About Animal Dander
Cockroach Allergens

Cockroach Allergens

Cockroach allergens are proteins found in cockroach saliva, feces, and body parts. They are most common in urban homes, particularly in kitchens, basements, and other areas where cockroaches may be present. Exposure can lead to runny nose, congestion, and asthma flare-ups, especially in children.
Learn More About Cockroach Allergies

Allergens by Season

Discover which allergens peak during each season and how they may affect different regions. This block highlights common triggers for spring, summer, fall, and winter, helping you plan ahead and manage symptoms all year long.

Spring

  • Tree pollen (trees such as Mulberry, Pine, Cedar, Elm, Birch, Oak, & Willow)
  • Grass pollen (grasses such as Bermuda, Rye, & Oat)
  • Mold Spores
  • Insect Bites and Stings (Insects such as Mosquitos, Bees, Wasps, Hornets, Fire ants, & Fleas)

Regional note

Tree pollen kicks off spring across the U.S., but timing varies. The Northeast sees birch, cedar, and maple early, the Southeast experiences oak, elm, and pine, the Midwest has oak, birch, and cedar, the Northwest gets alder, birch, and cedar, and the Southwest starts with juniper, cedar, and oak.

Summer

  • Tree pollen
  • Grass pollen (grasses such as Timothy, Kentucky blue, Johnson, Rye, Fescue, Bermuda, Bahia)
  • Mold Spores
  • Ragweed
  • Mugwort
  • Nettle
  • Summer Fruits and Veggies

Regional note

Grass and mold spores dominate summer allergies. The Northeast peaks in late spring to early summer, the Southeast experiences extended grass and mold season, the Midwest sees grass around May-June, the Northwest has grass and mold from May-July, and the Southwest can have year-round grass and weed pollen in urban areas.

Fall

  • Ragweed pollen
  • Mold spores
  • Dust mites
  • Pet Dander

Regional note

Weed pollens like ragweed peak in late summer and fall. The Northeast and Midwest see ragweed later in the season, the Southeast has a long ragweed period, the Northwest sees weeds in August–September, and the Southwest can experience continued weed and grass pollen.

Winter

  • Mold Spores
  • Pet Dander
  • Dust Mites
  • Household dust

Regional Note

Winter allergies are mostly indoor. Dust mites, pet dander, and mold affect all regions, though the Southeast and Southwest may see early tree pollen, and northern areas often have higher indoor exposure due to closed homes and heating.

Tips to Relieve Allergies

Reduce exposure and ease seasonal allergy symptoms with these expert tips. From adjusting your environment to daily habits, these strategies can help you breathe easier all year.
  • 1

    Close Windows During High Pollen Times

    Keep windows and doors closed, especially during peak pollen hours, to prevent outdoor allergens from entering your home.
  • 2

    Use a High-Efficiency Air Purifier

    Place HEPA air purifiers in bedrooms and living areas to trap pollen, dust, and mold spores indoors.
  • 3

    Shower and Change Clothes After Being Outside

    Pollen can cling to skin, hair, and clothing, washing up after outdoor activities reduces exposure.
  • 4

    Clean Surfaces Regularly

    Wipe down counters, tables, and floors to reduce dust, pet dander, and mold spores.
  • 5

    Monitor Local Pollen and Allergen Forecasts

    Knowing when allergens are at their peak helps you plan outdoor activities and take precautions.
  • 6

    Wear Sunglasses and a Mask Outdoors

    Protect your eyes from pollen and reduce inhalation of airborne allergens.
  • 7

    Use Saline Nasal Rinses or Allergy Medications

    Consult your doctor to help manage congestion, runny nose, or other symptoms.
  • 8

    Limit Outdoor Activities During Peak Pollen Hours

    Pollen counts are usually highest in the early morning and on windy days. Plan outdoor activities for later in the day or after a rainfall to reduce exposure.
  • 9

    Change Air Filters Regularly

    Replace HVAC and air purifier filters according to manufacturer recommendations to ensure they effectively trap pollen, dust, and other airborne allergens.

Allergen News & Updates

Stay up-to-date with the latest allergen news, research, and alerts. From seasonal trends to new studies and local updates, this section keeps you informed on what’s affecting allergy sufferers across the country.

Woman blowing her nose with a tissue, wearing a yellow shirt.
New April 8, 2026

Why Allergy Season Is Getting Longer-and Which Cities Are Hit the Hardest

Allergy season in the U.S. is becoming longer and more intense, driven by climate and weather patterns. New data also reveals surprising shifts in the “worst” cities for allergies, with places like Boise and San Diego climbing the rankings alongside traditionally high-impact regions.

Click Here to Learn More
Close up of pollen around a plant
New April 8, 2026

What Are the Worst Trees for Allergies?

Not all trees are equal when it comes to allergy symptoms. Research from North Carolina State University highlights that common hardwood trees, like oak, hickory, and birch, are among the biggest culprits, releasing microscopic pollen that is easily inhaled and can trigger stronger reactions. Meanwhile, more visible pollen from trees like pine is often mistaken as the cause, despite being less allergenic. Understanding which trees produce the most irritating pollen can help allergy sufferers better manage exposure and prepare for peak seasons.

Click Here to Learn More

Allergen Resources

Find reliable information and tools to help you understand allergens in your area. Explore pollen forecasts, indoor air quality tips, and guidance from trusted health organizations.

Check your Air Quality National Allergy Bureau Asthma & Allergy Forecast CDC - Allergens & Pollen Zyrtec's Allergen Guide Pollen.com

From the Breathe Easy Blog

Explore the Breathe Easy Blog for expert insights on seasonal allergens, practical tips for managing symptoms, and the latest research on air quality and allergy relief. Stay informed and take control of your health all year long.

View All Allergy Articles

References

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    Asthma & Allergy Foundation of America. (2022). Available at: https://aafa.org/allergies/types-of-allergies/pollen-allergy/tree-pollen-allergy/

  2. [2]

    Asthma & Allergy Foundation of America. (2022). Available at: https://aafa.org/allergies/types-of-allergies/pollen-allergy/grass-pollen-allergy/

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    Asthma & Allergy Foundation of America. (2022). Available at: https://aafa.org/allergies/types-of-allergies/insect-allergy/dust-mite-allergy/

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    CDC. Mold. Available at: https://www.cdc.gov/mold-health/about/index.html

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    Allergic to Your Pet? Learn About Dog and Cat Allergies. Asthma & Allergy Foundation of America. (2022). Available at: https://aafa.org/allergies/types-of-allergies/pet-dog-cat-allergies/

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    Asthma & Allergy Foundation of America. (2022). Available at: https://aafa.org/allergies/types-of-allergies/insect-allergy/cockroach-allergy/

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    WebMD. Relieve Allergy Symptoms Without Drugs. WebMD. (2013). Available at: https://www.webmd.com/allergies/allergy-relief-without-drugs

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    CDC. Taking Steps for Cleaner Air for Respiratory Virus Prevention. Respiratory Illnesses. Available at: https://www.cdc.gov/respiratory-viruses/prevention/air-quality.html?utm_source=chatgpt.com

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    Summer Allergies: Causes, Symptoms & Management | ZYRTEC®. Available at: https://www.zyrtec.com/allergy-guide/outdoors/understanding-summer-allergies

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    Spring Allergies: Causes, Symptoms & Management | ZYRTEC®. Available at: https://www.zyrtec.com/allergy-guide/outdoors/understanding-spring-allergies

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    Understanding Fall Allergies | ZYRTEC®. Available at: https://www.zyrtec.com/allergy-guide/outdoors/understanding-fall-allergies

  12. [12]

    Understanding Winter Allergies | ZYRTEC®. Available at: https://www.zyrtec.com/allergy-guide/outdoors/understanding-winter-allergies

  13. [13]

    A Regional Guide To Seasonal Allergies In The United States. Available at: https://familyallergy.com/allergies/a-regional-guide-to-seasonal-allergies-in-the-united-states/