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When most people think about allergies, they picture one season.

Maybe it’s spring when oak and cedar release pollen, or winter when mountain cedar triggers the notorious cedar fever that sweeps through San Antonio and the Hill Country. Once those seasons pass, many patients expect their symptoms to disappear.

But if you’re still dealing with congestion, sneezing, itchy eyes, or sinus pressure long after “peak” season ends, you’re not alone — and your allergies may not be seasonal at all.

In San Antonio, San Marcos, and throughout South Texas, allergy symptoms can flare year-round due to overlapping allergens, unpredictable weather patterns, and indoor triggers that never follow a calendar.

Allergy Seasons in South Texas Don’t Follow the Calendar

Many people assume allergies are a short-term problem tied to one season.

In reality, different allergens peak at different times of year — and as one fades, another often takes its place. That’s why so many South Texas residents experience symptoms during multiple seasons, or feel like their allergies never fully go away.

Common year-round and seasonal triggers in the San Antonio area include:

• Mountain cedar and oak tree pollen
• Grass pollen
• Ragweed and weed pollen
• Mold spores
• Dust mites
• Pet dander

For patients sensitive to several of these, symptoms can feel continuous — not because allergies are “bad this year,” but because the triggers keep rotating.

What Happens After Spring Allergy Season Ends?

Once spring tree pollen begins to taper off, many patients expect relief. Instead, grass pollen steps in as the next major trigger.

Grass Pollen Can Extend Allergy Symptoms Into Summer

Throughout late spring and summer, grasses release pollen that can cause:

• Sneezing
• Runny nose
• Nasal congestion
• Itchy, watery eyes
• Postnasal drip

Because grass pollen season in South Texas can stretch for several months, many patients continue experiencing symptoms well into summer before they ever connect their condition to grass.

Summer Allergies in San Antonio: Mold and Indoor Triggers

Summer doesn’t get the attention spring does, but it brings its own set of allergy challenges — particularly mold and indoor allergens.

Mold Thrives in Warm, Humid Conditions

While San Antonio is known for its heat, summer rain and humidity create ideal conditions for mold growth. Mold spores can be found:

• Outdoors in vegetation, mulch, and soil
• Around air conditioning units and drip pans
• In bathrooms, laundry rooms, and crawl spaces
• In any area of the home with moisture exposure

For patients with mold allergies, symptoms can persist regardless of what the outdoor pollen count shows.

Indoor Allergens Like Pet Dander Increase When We Stay Inside

As summer temperatures climb, most people spend more time indoors with windows closed and air conditioning running. This increases exposure to:

• Dust mites
• Pet dander, which consists of tiny dead skin flakes shed by pets
• Indoor mold
• Household dust

Pets can also bring in pollen from outside, increasing exposure even when windows stay closed.

Indoor allergens are one of the most overlooked reasons patients continue experiencing symptoms even when outdoor pollen levels drop. Shower before bed to remove allergens from your skin and hair after time outside, and use a HEPA air purifier to improve indoor air quality.

Fall Allergies: Ragweed Season in Texas

Many patients notice a second wave of symptoms in late summer and fall — and ragweed is usually the reason.

Ragweed Is One of the Most Common Fall Allergy Triggers

Ragweed pollen is a leading cause of fall allergies throughout Texas. Because ragweed pollen is lightweight and can travel for miles on the wind, exposure is extremely difficult to avoid, even if you’re not near any ragweed plants.

Common symptoms include:

• Sneezing
• Congestion
• Runny nose
• Itchy throat
• Watery eyes
• sore throat

Fall allergies are frequently mistaken for recurring colds. If your “cold” comes back every September or October, and itchiness that lasts for weeks points more to ongoing allergen exposure than an infectionragweed may be the actual culprit,

South Texas Weather Changes Can Worsen Symptoms

San Antonio’s weather is notoriously unpredictable. Shifts in temperature, wind, rainfall, and humidity all influence pollen dispersal and mold growth. Windy days can spread allergens over a wider area, while rain may temporarily reduce some triggers while encouraging mold and others.

This is one reason patients sometimes feel like symptoms appear out of nowhere.

Could You Be Allergic to More Than One Thing?

Many allergy sufferers assume they have one primary trigger. But it’s common — especially in South Texas — to be reactive to multiple allergens simultaneously.

For example, a patient might react to:

• Mountain cedar and oak in winter and spring
• Grass pollen during the summer
• Ragweed in the fall
• Dust mites and pet dander year-round

These common triggers often include pollen, and even everyday habits like sleeping with an open window can increase exposure.

When multiple allergen sensitivities overlap, symptoms can feel nearly constant. Allergy testing is often the only way to understand the full picture.

How Allergy Testing Can Help You Find Answers

If your symptoms continue outside of peak allergy season, testing with a board-certified allergist can identify exactly what’s driving them.

Testing can reveal:

• The specific allergens you’re reacting to
• Whether your triggers are seasonal, year-round, or both
• Environmental factors contributing to your symptoms
• Whether you’re a candidate for allergy immunotherapy (allergy shots or sublingual drops), which can provide long-term relief rather than just managing symptoms day to day

The more clearly you understand your allergy profile, the easier it becomes to build a treatment plan that actually works.

When Should You See a San Antonio Allergist?

Consider scheduling an evaluation if:

• Symptoms persist beyond a typical allergy season
• Over-the-counter medications have stopped working or need to be taken constantly; some oral decongestants provide temporary relief and can raise blood pressure
• You experience recurring sinus infections
• Symptoms interfere with sleep, work, or daily activities, especially when nighttime allergy symptoms and nasal symptoms like congestion disrupt sleep quality
• Asthma symptoms worsen during certain times of year

Persistent or worsening symptoms are a signal that a professional evaluation — not just another box of antihistamines — is the right next step. If you have high blood pressure, medications are also worth reviewing with an allergist, and some older allergy medications can have sedating effects, so ongoing fatigue should not be ignored.

Get Relief From Year-Round Allergies at Stone Oak Allergy

Allergy symptoms don’t follow a predictable schedule in South Texas — and neither should your treatment.

Whether your symptoms are triggered by cedar fever, grass pollen, mold, dust mites, or a combination of factors, understanding exactly what you’re reacting to is the first step toward lasting relief.

At Stone Oak Allergy, we offer comprehensive allergy testing and personalized treatment plans for patients in San Antonio, San Marcos, and the surrounding South Texas communities. Our goal is to help you manage both seasonal and year-round allergies — not just get through the next season.

Ready to Get Answers?

Schedule an appointment with Stone Oak Allergy in San Antonio or San Marcos to identify your triggers and explore treatment options that can help you breathe easier all year long.