Allergy Season in Illinois: Everything You Need to Know (2024)

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Illinois tends to have cold winters that give those with allergies a break from their symptoms. During the rest of the year, tree, grass, and weed pollen can be abundant, making it difficult for residents to manage their allergies.

Wyndly is a great resource for allergy sufferers. Our doctors will create a personalized treatment plan to help provide you with long-term relief from your allergies. Schedule a consultation today to get a personalized treatment plan, or read on to learn more about Illinois’s seasonal allergies.

What Are Seasonal Allergies?

Seasonal allergies typically refer to allergies that are triggered by pollen. Pollen is only released by plants during certain times of the year, because of this, these allergies aren’t year-round. The primary producers of pollen in Illinois are grasses, trees, and weeds.

When Is Allergy Season in Illinois?

Depending on what you are allergic to, you can experience allergy symptoms during any time of year in Illinois. Pollen allergies will flare up in the spring, summer, and fall, while indoor allergies can cause allergic reactions at any point in the year.

Illinois is in the Midwest Mississippi Valley allergy region. Each region has slightly different allergens and allergy seasons, but we’ve compiled the most common information for allergy season in Illinois.

Mid-West Allergen Zone Map

What Months Are Allergy Season in Illinois?

In Illinois, allergy season typically starts around February or March and ends after the first frost of winter. If you suffer from indoor allergies, such as allergies to dust, pet dander, or mold, you might notice that they worsen during the winter if you spend more time inside than usual.

When Does Allergy Season Start in Illinois?

Illinois allergy season starts in the spring. Because Illinois has a cold winter, seasonal allergies will commonly begin in late February or March. This is a bit shorter of an allergy season than most other states, making Illinois one of the better states for allergy sufferers.

When Is Peak Allergy Season in Illinois?

In Illinois, you’ll want to keep an eye on pollen counts in April, May, June, and September. Seasonal allergies tend to be at their peak during these months, so try limiting your time outdoors or going out in the evening when pollen counts tend to be lower.

If you have seasonal allergies and are traveling to Illinois during these four months, make sure you have an allergy treatment plan that works for you before your trip. During your trip, check the local pollen count daily to adjust your activities and plans accordingly.

When Does Allergy Season End in Illinois?

Typically winters are very cold in Illinois. This means that residents get a break from their seasonal allergies during the colder months. Even though Illinois might not have as many outdoor allergens to worry about during the winter, indoor allergens can still cause issues for many allergy sufferers.

Common Allergies in Illinois

While this is not a comprehensive list, some of the most common allergens in Illinois include:

  • Ryegrass
  • Bermuda grass
  • Timothy grass
  • Prairie grass
  • Ragweed
  • Wormwood
  • Orache
  • Pigweed
  • Sagebrush
  • Hickory
  • Ash
  • Cedar
  • Mulberry
  • Walnut

Read more about allergies in Illinois.

What Are Common Illinois Seasonal Allergy Symptoms?

The allergy symptoms you will experience in Illinois will vary based on the severity of your allergies and the time of year you are in Illinois.

Common symptoms you might experience in Illinois include:

  • Runny nose
  • Itchy and red eyes
  • Congestion
  • Headaches or sinus pressure
  • Uncontrollable sneezing
  • Brain fog
  • Post-nasal drip
  • Aggravated symptoms of asthma

How to Prepare for Seasonal Allergies in Illinois?

If you are suffering from seasonal allergies, take an allergy test to identify what allergens are triggering your symptoms. The easiest way to get an allergy test in Illinois is by ordering Wyndly’s at-home allergy test. Get your allergy test today to identify your allergies!

By understanding what allergies are causing your symptoms, it will be easier for you to avoid your triggers and find effective treatments.

Who Are Allergy Doctors in Illinois?

There are several types of providers you can go to for your allergies in Illinois. The most common types of allergy doctors are allergists, immunologists, and ENTs. When choosing an allergy doctor, the most important thing is choosing a provider you trust.

It is also important to work with a doctor who will consider both your test results and your allergy history to make sure they make sense together. You should also consider how long you will need to wait to be seen by them and how convenient it is for your schedule.

At Wyndly, our allergy doctors will work with you to get you long-term relief from your symptoms. Our doctors will create a personalized treatment plan for you based on your allergy test results and your allergy history.

Allergy Symptom Relief and Treatment in Illinois

Allergies can feel difficult to manage, but there are several different methods you can try out to decrease or eliminate your allergy symptoms.

Limit Exposure

An effective method of decreasing your symptoms is limiting your exposure to the allergens that are triggering your allergies. While pollen can be difficult to avoid, there are ways that you can decrease your exposure to pollen in Illinois.

  • Check pollen count: Keep an eye on pollen levels to see how high they are in Illinois for the day. If it’s a high pollen count, try limiting your time outside that day. Pollen tends to be at its highest in the morning and afternoon in Illinois. Evening hours will be the best time to go outside during the Illinois allergy season.
  • Trim trees, mow the lawn, and pull weeds: By keeping tree branches trimmed, grass short, and your lawn free of weeds, you can reduce the pollen that will be released directly around your home in Illinois.
  • Wear a mask outdoors: Wearing a dust mask when you go outside in Illinois can help prevent pollen from getting in your airways.
  • Clean on a regular basis: Pollen is a very sticky substance, meaning it’ll get in your home and on you and your clothes. Be sure to clean your house and do laundry frequently. Also, make sure to shower after being outdoors to wash off any pollen.
  • Close windows: Opening your windows will allow for more pollen to get into your home. If you can, keep your windows closed and run your A/C instead for the duration of the allergy season in Illinois.
  • Install a HEPA filter: Installing a HEPA filter on your A/C can help reduce the pollen levels circulating in your home.


Over-the-counter (OTC) medications are widely available in Illinois, and they provide short-term relief from your allergy symptoms. If you find that OTC antihistamines, nasal sprays, and eye drops don’t provide enough symptom relief from your seasonal allergies, you can look into allergy treatments that will provide long-term relief instead of just masking your symptoms.

Sublingual Immunotherapy

If you want lifelong relief from your seasonal allergies in Illinois, sublingual immunotherapy is the best solution. Sublingual immunotherapy involves exposing your immune system to small doses of the allergens that trigger your allergies. Through this exposure, your body becomes desensitized to your allergies, providing long-term relief. Sublingual immunotherapy is just as effective as allergy shots, but it can safely be taken from the comfort of your home.

Getting sublingual immunotherapy in Illinois is easy and convenient. You can get it shipped right to your home!

The Best Allergist in Illinois for Seasonal Allergies

If you are looking for the best doctor to treat your seasonal allergies in Illinois, look no further than Wyndly. At Wyndly, our allergy doctors will create a personalized treatment plan for your allergies to get you long-term allergy relief from your Illinois seasonal allergies.

Take our easy online assessment now to see if our doctors can get you long-term allergy relief from your seasonal allergies in Illinois!

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