Roof rats don’t read calendars, but they do feel temperature. In Greater Lakeland, the first sequence of nights below 70°F usually lands in the second week of October — sometimes the first week, sometimes the third. That’s when the calls come in.
Why temperature drives the move
Roof rats live outdoors most of the year. They nest in palms, mature oaks, citrus trees, and the dense vegetation of older Polk County blocks — Bartow’s Historic District, the Inwood and Pinehurst stretches in Winter Haven, the canopy along Auburndale’s Lake Ariana, and the rural lots out toward Mulberry. As long as it’s warm and dry up there, they stay.
Then the first cool snap hits. Suddenly your attic — 75°F minimum, dry, full of insulation that doubles as nesting material — looks better than a banana tree. The rats move in.
How they get in
Almost always from above. Roof rats are excellent climbers and they enter through:
- Roof-vent gaps — the screening corroded, the vent shifted, there’s a quarter-inch opening.
- Soffit-to-fascia separation — where the soffit meets the roof line, especially on older homes that have settled.
- Gable vent screens — same story as roof vents.
- AC line penetrations — the rubber boot on the AC line failed and there’s a finger-width hole.
The entry point is rarely where you’d guess from the noise. We’ve found rats coming in through a single soffit gap on the west elevation while the homeowner was sure the noise was on the east side.
What we do
The fix isn’t trapping. The fix is sealing. Trapping kills the rats already inside; sealing keeps the next ones out. We do both, in this order:
- Inspect — full attic walk, full exterior roofline walk, mark every penetration on a printed floor plan.
- Trap inside — snap traps in the attic harborage zones.
- Seal outside — hardware cloth, metal flashing, expanding foam where appropriate. Most Lakeland homes need 4–8 sealing points.
- Re-inspect at 30 days — confirm zero new activity.
When to call
The first time you hear scratching above the bedroom ceiling. Not the third. Roof rat populations double in about three months under attic conditions. A pair in October is twenty rats by January.
Full residential rodent scope is on the Pest Control page. For year-round prevention, Home Protection includes fall attic inspections every September as part of the standard cadence.
Part of the Lakeland Pest Pros Pest Library.
