Why Fire Ant Problems Peak Every Summer in the Pee Dee and Grand Strand

​If you’ve spent any time in a yard around Florence, Myrtle Beach, or anywhere in between during the summer months, you’ve probably learned to watch where you step. Fire ant mounds seem to show up everywhere — along sidewalks, next to driveways, right in the middle of the lawn where the kids play. At Harris Pest Control, summer is when our fire ant calls pick up the most, and there’s a good reason for that.

Because we protect homes throughout the Pee Dee and Grand Strand year-round, we get a front-row view of how fire ant activity changes from season to season. Summer is consistently when colonies are at their largest, and homeowners are most likely to encounter them.

Fire ant activity doesn’t stay the same throughout the year. Colonies follow a seasonal cycle, and summer is when everything ramps up. You may have already noticed that mounds tend to pop up overnight after a heavy rainstorm. But rain is only one trigger. The bigger factor behind summer fire ant problems is the colony’s population cycle — and understanding it can help homeowners in the Pee Dee and Grand Strand make better decisions about protecting their yards.

Fire Ant Colonies Follow a Population Cycle

Fire ants don’t just appear out of nowhere when the weather gets hot. Their colonies build up gradually over the course of the year.

In spring, queens ramp up egg production as soil temperatures climb. Workers expand foraging trails and start building out the tunnel network. By the time summer arrives, a single mature colony can house anywhere from 200,000 to 500,000 workers.

All those ants need to eat and need space. So the colony pushes outward. New tunnels, new foraging trails, and new mounds start appearing across the yard. Summer is when colonies are at their absolute largest, and that’s exactly why homeowners notice more activity than any other time of year.

At Harris Pest Control, we typically see the highest volume of fire ant service requests between late spring and early fall as expanding colonies become harder for homeowners to ignore.

Why Do Fire Ants Seem More Aggressive in the Heat?

It’s not just that there are more of them. Fire ants genuinely behave differently during peak summer months.

Warmer soil temperatures mean faster movement and faster response times. When a mound gets disturbed — by a lawnmower, a dog, a kid’s soccer ball — the colony reacts almost instantly. And because the colony is at its largest, more workers pour out of the mound at once. What might have been a handful of stings in spring can turn into dozens during the summer.

Fire ants also forage farther from the mound when temperatures are high. They’re searching for food and water across a wider area, which means you’re more likely to cross paths with them even if you’re nowhere near a visible mound. In the Grand Strand area, where sandy, well-drained soil and coastal heat create ideal conditions for colony expansion, it’s common to see foraging trails running across driveways and patios well away from the nearest mound.

Bare Feet, Garden Hoses, and Swing Sets

Here’s what makes summer fire ant activity especially problematic: it lines up perfectly with when families spend the most time outside.

Grilling on the patio. Weeding the garden. Kids running through the sprinkler. Pets rolling in the grass. Everyone’s barefoot or in sandals, and most of these activities happen right at ground level — exactly where fire ants are most active.

In Florence, Darlington, and the Pee Dee region, where many properties sit on larger lots with open, sunny yards, fire ant mounds can spread across a wide area without being immediately obvious. A mound tucked into tall grass or along the edge of a garden bed is easy to miss until someone steps on it. And because summer colonies are so large, a single encounter usually means multiple stings at once. For a full breakdown of what fire ant stings look like and how they affect different people, check out our fire ant guide.

This is one reason many homeowners choose ongoing fire ant protection instead of waiting until mounds appear. By the time large colonies become obvious, they've often been expanding for months.

Our technicians hear the same story all summer long — someone was mowing or playing with the kids and didn’t see the mound until it was too late. During peak season, those encounters are more frequent and more intense because there are simply more ants defending each colony.

Do Those Store-Bought Fire Ant Products Actually Work?

Most homeowners try to handle fire ants on their own first. It makes sense — you see a mound, you grab a bag of granules from the hardware store, and you treat it. The mound goes flat within a day or two, and you figure the problem’s taken care of.

But here’s what usually happens next: the colony doesn’t die. It relocates. Fire ant queens can sense a chemical threat and move the colony underground before the product fully reaches them. Instead of eliminating one colony, you end up scattering it into two or three new ones across the yard. A few weeks later, there are more mounds than you started with.

This is something our technicians see regularly throughout the Pee Dee and Grand Strand. Homeowners call us after spending an entire season fighting fire ants with retail products, and by that point, the infestation has multiplied. The mounds keep moving, but the problem never goes away.

How Year-Round Pest Control Keeps Fire Ants Under Control

The most effective approach to fire ants isn’t waiting until mounds appear and then reacting. It’s an ongoing treatment that targets colonies before they reach peak size — and keeps the pressure on them through the summer.

Harris Pest Control’s residential pest control plans include fire ant control within 25 feet of the home as part of the standard coverage. That proactive approach helps reduce the likelihood that large colonies will form in areas where families spend the most time outdoors.

That means regular treatments in the areas where your family actually spends time — the yard, patio, walkways, and play areas.

Professional-grade products work differently from what’s available at a hardware store. They’re designed to be carried back to the colony by foraging workers, eventually reaching the queen. During summer, when colonies are foraging at their most aggressive pace, those products are distributed throughout the colony more quickly. It’s actually one of the most effective times of year for treatment to take hold.

And because fire ants don’t disappear after a single application, ongoing coverage matters. Year-round pest control keeps colonies suppressed so they don’t rebuild and spread between treatments. If you’re seeing mounds in your yard and the store-bought products aren’t cutting it, reach out to schedule a free inspection.

Frequently Asked Questions About Summer Fire Ant Activity

Can fire ants damage outdoor equipment or electrical wiring?

They can. Fire ants are attracted to electrical currents and have been known to infest junction boxes, AC units, and irrigation system controls. If colonies establish themselves inside the equipment, the damage can be expensive to repair.

Do fire ants spread to other parts of the yard during summer?

Yes. Large colonies often produce winged reproductive ants during warm weather that leave to start new colonies. That's one reason a yard with a few mounds can gradually develop many more over time.

Do fire ants die off during winter?

No. Fire ant colonies survive year-round in South Carolina. During cooler weather, they move deeper into the soil and become less visible, then return to the surface as temperatures warm. That's why untreated colonies often come back season after season.

Take Your Yard Back from Fire Ants

If fire ant mounds keep showing up across your yard, no matter what you try, it’s time to stop guessing and start treating the problem at the source.

Contact Harris Pest Control to schedule a free inspection and learn how our home pest control services keep fire ants under control year-round.