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Cold Front in South Florida? The Pests That Come Inside
Family-run, licensed and insured pest control in South Florida.
$50 OFF your first service + FREE inspectionNew customers · No code needed · No expirationSouth Florida doesn't get a real winter, so when people ask what pests come inside when it gets cold in Florida, the honest answer is a few, for a few nights. A cold front here usually brings a handful of cool, breezy evenings, not a season. That's still enough to change what some pests do. Roof rats look for a warmer place to spend the night, and the attic is the closest one. Palmetto bugs that live in mulch, palm fronds and storm drains get pushed toward the house. A 10-minute walk around the house in the evening, ideally before the front arrives, catches most of it.
Which pests come inside when it gets cold in Florida
Most of our pests don't shut down when the weather turns. Mosquitoes keep breeding in any water that holds (we explain why in mosquitoes in November), and ants keep foraging. What changes is behavior. Pests that live outdoors start looking for shelter, and on a cool, windy night your house is the best shelter on the block.
Two pests account for most of the calls after a front comes through:
- Roof rats, which move from palms and fruit trees into attics.
- Palmetto bugs (American cockroaches), which come in from drains, mulch and the garage.
Wolf spiders can wander in too. Our wolf spider page notes that cooler nights can drive them indoors through gaps under doors and open garage doors. If it's something else you haven't seen before, take a photo and we'll identify it at the inspection.
Rats in the attic in cold weather
Roof rats spend most of their lives up high, in palm crowns, fruit trees and thick vines. Our roof rat page notes that their indoor activity often rises in cooler or rainy periods, and a front brings both. They don't need a new route to get in. They use the same one they always could: a palm frond or branch touching the roof, then a gap at the soffit, a roof vent or the spot where the AC line goes through the wall. Our post on how roof rats get in the attic follows that route step by step.
The first sign is usually sound. Scratching or quick running in the ceiling after dark, often right after the first cool night, is the classic one. If that's what you're hearing, scratching in the ceiling at night covers what it usually is and what to do first.
Palmetto bugs: why roaches come inside when it gets cold
The big roaches people call palmetto bugs live outside by the thousands, in storm drains, sewer lines, tree holes, palm fronds and damp mulch. As our American cockroach page puts it, heavy rain, drain work or a sudden drop in temperature can push more of them indoors.
They usually come in low:
- Under a garage door with a worn seal or gaps at the corners.
- Through gaps under back and side doors.
- Up through a drain whose trap has dried out, like a guest shower or a laundry floor drain. Our post on roaches coming up the drain explains how that happens.
One roach on a cool night isn't always an infestation. Seeing them again and again usually means there's a source close by, and that's worth a look.
The 10-minute evening check before a cold front
Do this at dusk, when you can see light under doors and catch movement on the roofline:
- Garage door. Look at the bottom seal and both corners. If you can see daylight from inside, a rat or a roach can get through.
- Door sweeps. Check the back door, side doors and the door from the garage into the house.
- Unused drains. Run water for a few seconds in guest sinks, showers and floor drains so the traps don't dry out.
- The roofline. Walk around and look up. Palm fronds, branches or vines touching the roof are a bridge for roof rats.
- Pet door. Close it at night.
- The lanai and yard. Bring pet food in at night and pick up fallen fruit.
Write down anything you find. It helps the inspection go faster.
What we do after a cold front
Every job starts with an inspection.
For roof rats, we inspect for entry points, set traps and tamper-resistant bait stations, and seal the gaps rodents are using with exclusion work, to help keep them from getting back in. Inside the home we use traps only, never loose bait. Bait stations stay outside. We seal the entry points ourselves; we don't repair roofs, wood or tile. We come back to check and reset traps and stations, and we'll tell you how many visits your home is likely to need. More on the sealing side in what rodent exclusion is, or see our rodent control service.
For palmetto bugs, our pest control service treats a band around the foundation and the entry points like door gaps and weep holes, plus crack-and-crevice work and baits inside where roaches hide. Keep kids and pets off treated areas until dry, and follow your technician's instructions.
Our general plan is $125 per quarter, about $42 a month, and monthly or custom schedules are quoted after the inspection. For plan customers: "If pests come back between visits, so do we, at no extra cost." There are no long-term contracts and no cancellation fees, just a simple service agreement. We're family-run and licensed, with 30+ years in the business, and hablamos español. For what to expect the rest of the year, see our South Florida pest calendar, or browse more guides.
Cold-front questions
Do bugs come inside when it's cold in South Florida?
Can rats freeze in cold weather here?
Does keeping the AC on keep roaches away?
What are the worst months for bugs in Florida?
Hearing something in the attic since the front came through?
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