Solutions for Missouri’s Allergy Season

See A St. Louis Seasonal Allergy Specialist

When is the allergy season in St. Louis? Dr. Sonia Cajigal is a board-certified St. Louis seasonal allergy specialist that can help you live comfortably throughout Missouri’s allergy season. Learn more about pollen & ragweed season, how to reduce triggers, & more.

“I had my first appointment with Dr. Cajigal. She’s wonderful. A different doctor had said there wasn’t much I could do for my allergies, except maybe move out of state. I was desperate and came to this doctor for help. She listened and was very thorough in her diagnosing my problems. I’m not better yet but I’m very pleased with how this appointment went and I’m optimistic about my health!”

– Rosana B, December 2021

Seasonal allergy specialist Dr. Sonia Cajigal of St. Louis Family Allergy in St. Louis, Missouri
Seasonal allergy specialist Dr. Sonia Cajigal of St. Louis Family Allergy review badges and affiliations

About Seasonal Allergies

When is Allergy Season?

Seasonal Allergy Rankings

Seasonal Allergy Symptoms

Seasonal Allergy Treatment

When is Allergy Season in St. Louis, Missouri?

Depending on what you’re allergic to, your seasonal allergies may peak in the spring, fall, winter, or affect you year-round. Learn about each of the allergy seasons in St. Louis Missouri below.

Spring Allergy Season

The spring allergy season in St. Louis typically starts in March and extends into mid-July. Pollinating trees usually mark the start of spring allergy season and continue releasing pollen well into May. Common culprits of seasonal allergies in St. Louis include oak trees, cedar trees, hickory trees, walnut trees, and ash trees. A number of other less common trees are also responsible for seasonal allergies in St. Louis, including aspen, alder, ash, birch, beech, box elder, cottonwood, elm, mountain elder, mulberry, olive, poplar, pecan, and willow trees.

The St. Louis Missouri spring allergy season is extended by pollinating grass, which typically starts in May and ends in mid-July.

Fall Allergy Season

St. Louis Missouri fall allergy season starts with the bloom of ragweed in August and usually peaks in mid-September. Ragweed is prevalent in Missouri, and is the primary cause of seasonal allergies from late August through the first frost of early winter (Missouri’s ragweed season). Most individuals that experience allergy symptoms in the fall are allergic to ragweed. Other allergenic plants that trigger fall allergies include burning bush, cocklebur, lamb’s-quarters, mugwort, pigweed, russian thistle, sagebrush, and tumbleweed.

Seasonal Allergy Variation

Several factors can influence the onset, duration, and severity of seasonal allergy symptoms.
  • Mold levels can peak during specific weather patterns, sometimes imitating seasonal allergies. Mold grows quickly during rainy periods, and also during hot and humid periods.
  • Pollen levels are usually highest in the morning, and are amplified by wind and warm weather.
  • Mild winter temperatures can cause plants to pollinate early, making spring allergy season start earlier than March.
  • A rainy spring can promote rapid plant growth and high pollen levels that persist into the fall.
See a Seasonal Allergy Doctor

in St. Louis, Missouri

Tree pollen causing seasonal allergies in St. Louis

Seasonal Allergies in St. Louis Missouri

The Asthma and Allergy Foundation of America (AAFA) releases its annual Allergy Capitals™ report every year, which collects data on the 100 most-populated metropolitan areas of the US and identifies which cities are the most challenging places to live with seasonal allergies. The city ranks are calculated based on factors such as seasonal pollen scores, allergy medication use per patient, and number of board certified allergy specialists per patient, among others.

Are Allergies Bad in St. Louis Missouri?

For spring allergies, St. Louis, Missouri was ranked as the 31st most challenging place to live in 2021. In 2020, St. Louis was ranked 29th. In 2018, it ranked 41st. In 2016, St. Louis ranked 35th.

For fall allergies, St. Louis, Missouri was ranked as the 24th most challenging place to live in 2021. In 2020, St. Louis was ranked 29th. In 2018, it ranked 40th. In 2016, St. Louis ranked 38th.

Overall, St. Louis Missouri was ranked as the 27th most challenging place to live with allergies out of the US’s 100 most-populated metropolitan areas in 2021.

St. Louis AAFA Annual Allergy Capital Ranking

The table below shows overall, spring, and fall St. Louis Missouri allergy season rankings over recent years.

Year Season Rank Out of 100
2021 Overall 27
2020 Overall 30
2021 Spring 31
2020 Spring 29
2018 Spring 41
2016 Spring 35
2021 Fall 24
2020 Fall 29
2018 Fall 40
2016 Fall 38
See a Seasonal Allergy Doctor

in St. Louis, Missouri

Child with seasonal allergies in St. Louis, Missouri

Seasonal Allergy Symptoms

Seasonal allergies, also called seasonal allergic rhinitis or hay fever, cause symptoms such as runny nose, itchy eyes, sneezing, and cough. Your symptoms may vary depending on what you’re allergic to, and could could include any of the following:

  • Coughing
  • Frequent sneezing
  • Wheezing
  • Runny nose
  • Congestion
  • Sinus pressure
  • Scratchy throat
  • Excess saliva
  • Itchy, stinging, watery eyes
  • Fatigue
  • Trouble Sleeping
  • Asthma symptoms

Seasonal Allergy Diagnosis

Seasonal allergy symptoms tend to be relatively consistent from allergen to allergen. In other words, an allergy to oak tree pollen can look a lot like a ragweed allergy, but you’re not necessarily allergic to both if you’re allergic to one of them. Understanding exactly what you’re allergic to can make it much easier to navigate seasonal allergies in St. Louis and know what you should (and should not!) be avoiding. This is where allergy testing comes in. Dr. Cajigal is a seasonal allergy specialist that can help you determine if your symptoms are caused by allergies and pinpoint what you’re allergic to so you can find relief.

Seasonal allergy diagnosis starts with a thorough medical history, and usually involves skin or blood tests to determine your specific allergic triggers. Once your specific triggers are known, Dr. Cajigal can help you determine how to reduce seasonal allergy triggers in St. Louis Missouri.

See a Seasonal Allergy Doctor

in St. Louis, Missouri

Woman with seasonal allergies that needs to allergy-proof her home

Seasonal Allergy Treatment

Once you’re aware of what’s causing your allergies, there are steps you can take to minimize exposure to allergens, effectively manage allergic reactions if they occur, and prevent certain allergic reactions altogether.

Limit Your Exposure to Airborne Allergens

These tips can help you minimize your exposure to airborne allergens during allergy season:
  • Check your local pollen counts whenever you check the weather
  • Limit outdoor activities during times of high pollen counts
  • Wear sunglasses and a wide brimmed hat to reduce pollen exposure when outdoors
  • Change clothes as soon as you get home if you’ve spent a lot of time outdoors
When you visit us at St. Louis Family Allergy, Dr. Cajigal will have additional recommendations for you based on your unique case.

Allergy-Proof Your Home

These tips can help you minimize exposure to allergens in your home:

  • Keep windows closed during high pollen and mold seasons to prevent allergens from entering
  • House dust can contain pollen and mold, so it’s important to clean regularly
  • Steam clean carpets or remove carpets altogether
  • Avoid air drying laundry outside
  • Keep pets out of the bedroom to reduce pet dander in your bedding
  • Vacuum with a HEPA filter to reduce dust in your home
  • Wash your bed linens and pillowcases in hot water and detergent frequently to reduce allergens
  • Use dust mite proof covers for pillows, comforters, duvets, mattresses and box springs
  • Men should shave frequently to prevent pollen from gathering in their facial hair

Medications for Seasonal Allergies

There are a number of over-the-counter and prescription medications that can help relieve seasonal allergy symptoms. Be sure to discuss any medications with your allergist prior to using them. Medications to relieve seasonal allergic rhinitis, for example, are most effective if you start taking them before pollen is in the air, prior to allergy symptoms developing. Medications include:
  • Antihistamines
  • Decongestants
  • Nasal corticosteroids (nasal spray)
  • Leukotriene receptor antagonists
  • Cromolyn sodium

Allergy Shots for Seasonal Allergies

Allergy shots are also an option if you’re looking for long-term, ongoing symptom relief from seasonal allergies. We hope you’ve found this information helpful. Get in touch with us at St. Louis Family Allergy to learn more about seasonal allergies and how to most effectively manage them! We’re looking forward to your visit.


[1] American College of Allergy, Asthma & Immunology:
[2] Asthma and Allergy Foundation of America:
[3] Allergy Capitals Report:

More Specialties


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Seasonal Allergy Specialist Dr. Sonia Cajigal

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"Dr. Cajigal was friendly, professional, and informative. She took the time to explain the tests and what was going on with my allergies. She is so knowledgeable and really cared about how I was feeling. I would highly recommend this practice if you suffer from allergies and asthma."

- Sue D, July 2020

“Dr Cajigal is a great listener. She trusts her patients instead of treating them as if they are not the experts of their own bodies. I really appreciate that (many doctors do not have that quality). She also immediately treats the symptoms instead of waiting to see if things clear. I use her for my children and myself. We have never left her office feeling as if it was a waste of time.”

– Stephanie, August 2020

"Great Allergist!"

- Ann H, December 2018

"She is the best."

- Stephen W, June 2020

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