Iola is a Waupaca County village surrounded by the Chain O’ Lakes region and heavy seasonal-cabin country. That combination makes it one of the busiest towns on our map for bat work, and the reason is straightforward: a cabin is a better roost than a house.
Why seasonal property is different
A maternity colony wants somewhere quiet, warm under the roof, undisturbed, and — critically — unoccupied. A cabin closed in October and reopened in late May is empty for the entire period a colony forms, gives birth, and raises pups to flight.
Nobody is there to hear the scratching in June. Nobody notices the staining at the soffit. By the time the owner arrives for the season, the colony has had months of undisturbed use and the attic shows it.
The setting compounds it. Woodland lots and open water across the Chain O’ Lakes support the insect populations bats feed on, so the local bat population is healthy — which is ecologically good and structurally inconvenient.
The timing is the job
This is the part that separates bat work from every other pest on this site: you cannot simply do it when you notice it.
Wisconsin bats are protected, and exclusion is timed around the maternity season. Seal a roost while flightless pups are inside and they die in the structure. In a cabin that means an odor problem and a fly problem inside a building you only visit occasionally — which is considerably worse than the bats were.
Source: Wisconsin Department of Natural Resources bat regulations. Reviewed by Brian Zahringer, WI Commercial Applicator #103689 — August 2026.
So the single most common mistake we correct around Iola is the well-meant one: owner opens the cabin in May, finds droppings, seals the gap that afternoon. That is the worst possible week to do it.
Autumn is usually the right window here, and it fits how people use these properties. The pups are flying, the colony is preparing to move on, and you are up at the cabin closing it down anyway. The building then sits sealed through the winter rather than sitting available.
Where they get in on a cottage
A bat needs about a finger’s width. On the cabins and older cottages around Iola the recurring routes are:
- The gap where the roof meets the gable end
- Ridge and soffit junctions
- Lifted or loose flashing
- Behind fascia boards that have pulled away
- Chimney and stovepipe penetrations
- Cupped or split board siding
- The seams left where additions were built on over the decades — the most productive place to look on an old cottage
The two things people forget
The guano. In an enclosed cabin attic it accumulates, soaks into insulation, and concentrates rather than airing out. It is an air-quality issue and it attracts its own insects. Cleanup is part of the job.
The mites. When the colony leaves, the parasites that fed on it disperse looking for a host and come down into living space. Biting that starts a few days after the bats go is the classic pattern — see bird and rodent mites. Treating the roost site prevents it.
Working around a cabin schedule
Most of our Iola bat customers are not there most of the time, and we plan around that rather than treating it as an obstacle. One-way exclusion devices sit in place for a period and then need checking and removing, which does not require you present. We coordinate with owners driving up from the Fox Valley, Madison and Milwaukee, and we would rather fix the schedule in advance than have you make a trip for something we could have done alone.
For the full picture see the bats profile, the Wisconsin bat exclusion law guide for how the timing works, and the cabin and seasonal property guide for everything else that comes with closing a place up.