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Thomas Lupoli, D.O.

The Complete Guide to Florida Fall Allergy Season 2026

fall allergies in jacksonville

updated: Oct 2026

Most people in America look forward to autumn with its pumpkin spice lattes, mild sun, and cooler air.

North Floridians, though, know this time of year as “extended summer.” And if you deal with fall allergies, October can be a frustrating month.

For 2026, the biggest fall allergy concern in Jacksonville and throughout much of the Southeast is expected to be weed pollen, including ragweed and other fall weeds. Grass pollen may not be as high as usual in many parts of the Southeast because of the dry stretches we had through late summer, but weed pollen is still expected to be an issue and could linger into October.

Here in Jacksonville, we also had a noticeable weather shift in early October. After a dry summer, the first couple weeks of October brought a lot of rain. That can temporarily wash pollen out of the air, but it can also create the conditions for more mold growth and a rebound in weed growth once the weather dries out again.

With the right precautions and the right allergy treatment plan, you can still enjoy the better parts of fall in North Florida.

What to Expect for Fall Allergies in Jacksonville in 2026

This year’s fall allergy season looks a little different from some recent years.

Grass pollen may be less of the main issue because much of the Southeast had enough dry weather to limit grass growth. That does not mean grass pollen disappears completely, but it may not be the biggest driver of symptoms for many Jacksonville allergy sufferers this fall.

Weed pollen is the bigger concern. Ragweed and other fall weeds tend to be the main triggers this time of year, and forecasts point to higher weed pollen levels across parts of the Southeast. Warm fall weather can also keep weeds active longer, which means symptoms may continue well into October.

The other issue to watch is mold. Jacksonville had a dry summer, but the first part of October brought a lot of rainfall. That kind of sudden moisture can create problems around wet leaves, grass clippings, mulch, compost piles, gutters, and other damp areas around the home.

For patients, that means fall symptoms may come from more than one trigger. Sneezing, congestion, itchy eyes, coughing, sinus pressure, and asthma flare-ups may be tied to weed pollen, mold, or both.

What are fall allergy symptoms?

Fall allergy symptoms are not much different than what you would expect at other times of year. Most people refer to their symptoms as hay fever, while doctors refer to it as seasonal allergic rhinitis.

Whatever you call it, symptoms include:

  • Itchy, watery, and stinging eyes.
  • Coughing and wheezing, potentially leading to asthma for sufferers.
  • Scratchy throats and excessive saliva
  • Upset stomach
  • Worsening eczema
  • Life-threatening asthma attacks in extreme cases.

What are the most common Florida fall allergens?

Here in Florida, most fall allergies are caused by weed pollen and mold spores. Grass pollen can still be a factor, especially when we have warm and humid weather, but for 2026 the bigger concern appears to be weed pollen, especially after early October rainfall helped add moisture back into the area.

Because Jacksonville has a long growing season and does not usually get an early hard freeze, fall allergy symptoms can last longer here than they do in many other parts of the country.

Here are the most common culprits we have to contend with:

Ragweed

ragweed fall allergies

Common Ragweed plant

This is probably the number-one cause of fall allergies. Ragweed thrives all over the Central and Eastern United States, from far north to deep south. If you have hay fever symptoms in the fall, it’s almost certainly due to ragweed.

Though ragweed starts to release it’s pollen with cool evenings and warm, humid days in August, it can continue well last into September through October.

Approximately 75% of people who are have spring plant allergies are also allergic to ragweed.

Additionally, ragweed pollen gets around. The amazing thing is that even if ragweed pollen isn’t common where you live, wind blown ragweed allergens can travel for hundreds of miles!

For 2026, ragweed and other weed pollens are expected to be a bigger fall allergy issue across parts of the Southeast. In Jacksonville, the early October rain may make symptoms feel a little unpredictable. Rain can briefly reduce pollen in the air, but once things dry out again, weed growth and pollen can rebound.

Common Ragweed

It can grow as tall as five feet, with leaves that are arranged alternately and leaf blades that are long and have deep divisions in them. The flowers are not “showy” and result in small, green or yellow spikes.

Giant Ragweed

Fittingly named, giant ragweed can grow up to 15 feet high, with stems that have multiple branches and hairy leaves that grow opposite of each other (until you get high up the weed). The leaves are sandpaper-rough and rounded.

Both types of ragweed release their pollen in late summer and continue to saturate the air through the first frost (which doesn’t happen often here in North Florida).

One ragweed plant is capable of producing more than one billion grains of pollen per season.

Treatment and Defense against Ragweed Allergies

The best defense is a good offense.

With proper weed control, you can get rid of the ragweed around your home. Remove any ragweed plants you find around your property and have your yard treated to kill weeds and control the pollen release near your home.

Also do not wait to contact your allergy specialist to plan your allergy treatments. Allergy immunotherapy treatment involves administering small doses of an allergen to get your body used to it and induce long-term tolerance of the allergen.

Mold Allergies

Mold is found wherever the weather is damp and cool. While we don’t have long-term cool weather, we do have a good amount of humidity, and the cooler fall air (which can dip into the 40s during the evening) can lead to an increase in mold growth for North Floridians. Molds grow especially well in decaying plant matter, such as leaves and grass clippings, as well as compost piles and rotting, wet wood.

allergy causing dead leaves

Leaves and debris can carry mold allergens

The first defense is to clear leaves and piles of plants that could invite mold growth, and fix or remove rotting wood. Don’t forget to look around your house (including inside) where dampness occurs and where mold growth may hide.

According to our friends at the American Academy of Allergy, Asthma & Immunology (AAAAI), our weather plays a significant role in how bad mold allergies will be.

The damper the conditions, the more mold there will be. Jacksonville had a dry summer, but the first part of October brought a lot of rainfall. That sudden moisture can create mold problems around wet leaves, grass clippings, mulch, compost piles, gutters, and other damp areas around the home.

Even if pollen counts drop briefly after rain, mold can become a bigger issue afterward, especially once wet outdoor debris starts to break down. For people with asthma or mold sensitivity, that can mean more coughing, wheezing, congestion, sinus pressure, or eye irritation.

Fall allergies are getting worse, and with the extended seasons we have and the extended tropical weather season going into November, we can expect worse fall allergies this year and for years to come.

Also, while it is not the threat it once was, we should still be wise about the threat of COVID and viral asthma along with the usual cold and flu season that could create additional problems this fall.

Mold spores spread through the air similar to the way pollen allergens do, but there are two major differences: Mold spreads easily indoors and does not die off with a cold snap — it will just go dormant until temperatures are warm enough to bring it out of it’s dormancy.

This means mold can reappear here in Jacksonville with the first early signs of spring in late February.

Treatment and Defense against Mold and Spore Allergies

This is another case where taking precautions can really help limit your and your family’s exposure to mold.

First and foremost, clean up all dead and decaying plant material from around your house, rake up those leaves, get rid of rotting wood, clear your gutters of debris, and clean up compost and garden beds. This is especially important after heavy fall rain. If leaves, branches, grass clippings, or mulch stay wet around your home, they can become a strong mold trigger. Try to clear damp debris once the weather allows, and pay extra attention to gutters, shaded areas, patios, garages, and spots where water tends to sit.

Inside your house, consider investing in a good dehumidifier. Do your best to keep humidity levels low—below 50 percent is ideal within your house. In your garage and attic, make sure boxes aren’t damp and ensure insulation hasn’t gotten wet from the heavy rains we’ve been experiencing. Attics and garages can be a major incubator where mold can grow.

If allergy symptoms hit, make sure to visit your allergist. Mold is a potent asthma trigger and you’ll want to have your inhalers ready and have your allergy and asthma management plan in place. If you’ve only recently developed allergies, your allergy specialist can test for your specific allergies to pollens and molds, which will help determine if you should start allergy shots. Immunotherapy is a proven method for controlling fall allergies.

Grass Pollen

Grass pollen is usually more of a spring and summer allergy trigger, but it can still bother patients in the fall here in North Florida.

For 2026, grass pollen may be lower than usual in parts of the Southeast because of the dry stretches we had through late summer. Still, warm weather, humidity, lawn maintenance, and rainfall can all stir up symptoms for people who are sensitive to grass.

If grass pollen is one of your triggers, simple habits can help:

  • Shower after spending time outside
  • Change clothes after yard work
  • Take shoes off before coming inside
  • Keep windows closed on high-pollen days
  • Wear a mask when mowing or doing yard work

Other Seasonally Related Triggers

While people think of “seasonal allergies” as referring to grass, pollen and mold allergies, there can also be other allergy triggers that are closely tied to specific seasons. Among other fall allergy triggers:

  • Smoke (from fall campfires)—Fall weather in Jacksonville makes for ideal s’mores roasting time and a small bonfire makes the early evenings a bit more cozy—but if the smoke from campfires results in an asthma attack, then it’s no fun at all. Since smoke is a common asthma trigger, always sit upwind of the smoke and keep your distance from the fire to prevent an asthma flare-up.
  • Insect bites and stings—for insect allergy sufferers, certain bugs around your yard can be more than just a nuisance. An estimated two million Americans are allergic to insect stings, which can cause the life-threatening allergic reaction known as anaphylaxis. Anyone with an insect allergy should always carry an allergist prescribed epinephrine. Additional steps you can take to reduce insect stings is always wear shoes in the yard, keep food covered and not drinking from open soft drinks which attract bugs. Another thing you can do is hire a professional pest control company to treat for insects around your yard and home.
  • Candy ingredients—Halloween is almost upon us and Thanksgiving is right behind, many of these holiday’s most popular foods—especially among children—can lead to dangerous allergic reactions for food allergy sufferers. Make sure to check food ingredients and let others know about yours or your children’s food allergies.

Additional Tips to Manage and Control Your Fall Allergies

  • When possible, stay inside and keep doors and windows closed when pollen is at it’s highest (usually in the morning or midday)—Like our Facebook Page to get daily pollen counts in our area or visit Pollen.com for your own local area.
  • Before you turn on the heat in your house for the first time, make sure to clean the heating vents and change filters. Sometimes mold and other allergens get trapped in the vents over our humid summers and will fill the air in your house once the heat kicks on.
  • Invest in a HEPA filter for your home’s HVAC system. These filters force air through a fine mesh and traps harmful allergens and particles such as pollen, pet dander, mites, and tobacco smoke.
  • Use a dehumidifier to keep the air inside your home below 50% humidity.
  • Wear a mask when working outside and in your yard so you don’t breathe in mold spores—this is especially important if you are raking leaves or picking up decaying grass clippings.

With proper care and clean up, and some preventative medications, you can enjoy the great fall weather we have here in Jacksonville.

When Fall Allergies Keep Coming Back

If every fall feels like the same cycle of congestion, sinus pressure, itchy eyes, and medication, it may be time to find out exactly what is triggering your symptoms.

Allergy testing can help identify whether your fall symptoms are coming from ragweed, other weed pollen, grass pollen, mold, dust mites, pet dander, or another trigger. Once the trigger is clear, your allergist can help build a treatment plan that fits your symptoms.

For some patients, allergy shots may also be an option. Allergy shots are designed to help your body become less sensitive to specific allergens over time. The goal is not just to get through one bad allergy season, but to reduce symptoms and, when possible, decrease the need for daily allergy medication.

If fall allergies are affecting your sleep, breathing, work, school, or daily routine, schedule an appointment with Allergy & Asthma Specialists of North Florida.

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additional sources:
Action News Jax
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