Raccoons From the Lagoon, Rats From the Rails: A Chicago Lawn Pest Guide

A park plan from 1903 that still sets the pest map

Marquette Park was laid out by the Olmsted Brothers in the early 1900s as one of a group of new South Side parks, and at 323 acres it is the largest neighborhood park the South Park Commission created. The design called for a golf course on islands wrapped by a naturalistic lagoon. That lagoon still winds through the grounds, the nine-hole course keeps water in play on most of its holes, and a remnant of native prairie was moved to the lagoon's edge east of Kedzie Avenue. At the northeast corner, near Marquette Road and California Avenue, stands the Art Deco monument to Steponas Darius and Stasys Girenas, the Lithuanian American pilots who died in the 1933 Lituanica crash.

To a raccoon, a skunk or an opossum, all of that adds up to an ideal home range: permanent water, acres of mowed turf full of beetle grubs, shrub borders for cover and buildings with crawl spaces and eaves. Wildlife lives inside the park and forages outward at night, which is why houses facing it on Marquette Road, 71st Street, Kedzie Avenue and California Avenue see far more animal activity than houses only half a mile away. Coyotes are occasionally seen crossing the grounds too, though they rarely cause problems at homes.

Raccoons: the most common park-edge call

Raccoons are strong, patient and very good at finding the weakest board on a roof. Near the park they climb downspouts and porch posts, peel back aging soffits, lift loose roof vents and drop into chimneys that have never had a cap. Pregnant females begin hunting for a den in February, and kits are usually born in attics, chimney flues and garage rafters from March through May. The noise is heavier and more deliberate than squirrel activity, mostly at night, and by late spring it may include the chirping and chattering of young.

Outdoors the damage is just as familiar: carts knocked over, pet dishes emptied, and patches of sod rolled back like carpet as raccoons dig for grubs on the lawns nearest the park. Raccoon droppings can carry the eggs of raccoon roundworm, a parasite that can be dangerous to people, so attic latrines and soiled insulation should be removed by someone wearing proper protection rather than swept up by hand.

A wildlife specialist will usually confirm the animal from tracks, droppings and the shape of the damage, then check for young before choosing a method. Under Illinois rules, removal is handled through one-way exclusion doors or humane trapping by permitted operators. When kits are present, the work is timed so the mother can carry them out, or the young are removed by hand and placed in a reunion box. The opening is then closed with heavy-gauge steel mesh or sheet metal, and a chimney cap goes on before the next February.

Skunk dens under stoops, sheds and decks

Striped skunks are the second park animal, and their signature is underground. They dig small cone-shaped holes in lawns while hunting grubs at night and den beneath concrete stoops, porches, sheds and backyard decks. Mating season runs through late winter, which is when the smell is most likely to drift into a house, and young are born under those structures in May and June. Virginia opossums often use the same cavities and also slip into garages left open overnight, especially when pet food or fallen fruit is easy to reach.

Removal usually means confirming the den is active, fitting a one-way flap over the entrance, waiting several nights for the skunk to leave, and then burying an L-shaped skirt of galvanized hardware cloth around the base of the structure so the next skunk cannot dig in. Timing matters. Sealing a den in late spring with a litter inside creates a much worse problem within days. Skunks are also a rabies vector species in Illinois, so trapping and handling belong to permitted specialists.

The Belt Railway, the eastern tracks and the rats they shelter

The community's southern border is the Belt Railway of Chicago, and its eastern edge follows freight tracks, which means two long ribbons of ballast, brush and fence line wrap the residential grid. Norway rats burrow along those embankments where the soil is rarely disturbed, and homes on the blocks nearest the tracks usually see burrows first each spring. Rats that settle under a cracked garage slab beside the right of way can stay for years, expanding the tunnel system each season and sending young into neighboring yards by late summer.

Farther inside the grid, along 63rd Street and the older two-flat blocks, rats behave as they do in most dense Chicago neighborhoods. They burrow under garage aprons, along fence posts and beneath rear wooden stairs, and they feed on spilled garbage, dog waste, birdseed and garden produce. Signs include two- to four-inch holes with smooth, packed edges, greasy rub marks along foundations and gnawed cart lids. A licensed exterminator anchors tamper-resistant stations at the garage and fence, monitors and collapses burrows, and points out the food source. A 311 request brings a city crew to bait the public alley, and several neighbors filing at once tends to speed the response.

Mice and roaches in the 1920s building stock

Chicago Lawn was founded in 1871 by John F. Eberhart, annexed to Chicago in 1889 and then remained mostly farmland until the 1920s, when the population jumped from about 14,000 to about 47,000 in a single decade. Germans and Irish came first, followed by Poles, Bohemians and especially Lithuanians, whose churches and institutions earned the area the nickname of the Lithuanian Gold Coast. Today the community is largely Hispanic and Black, with a long-established Palestinian American presence near 63rd Street, but the brick bungalows and two-flats of that decade are still the backbone of the housing.

Those buildings are now a century old. House mice enter through gaps around gas and water lines, basement window frames and the joint where front steps meet the facade, mostly from October on. German cockroaches are the bigger issue in two-flats and the small courtyard and corner apartment buildings on the busier streets, because they travel along shared plumbing stacks between kitchens. Treatment only holds when both units, and ideally the shared basement, are serviced in the same week with baits and growth regulators rather than sprays.

Park-facing bungalow, interior two-flat or rail-edge house

Where a house sits matters as much as what kind of house it is. A bungalow facing the park needs wildlife-proofing at the roofline and foundation. A two-flat on an interior block needs rodent- and roach-proofing at the alley, garage and plumbing. A house backing onto the Belt Railway or the eastern tracks needs a rat plan first. Many homes fall between categories, so use the list below to decide where to start.

• Park-facing bungalow: chimney cap, roof vents, soffit corners, the void under the front stoop, and the base of any deck or shed.
• Interior bungalow: basement window frames, utility penetrations, the garage slab and the overhead door seal.
• Two-flat: the pipe chase behind both kitchens, the rear wooden stairs, the shared laundry and the gap under the back door.
• Rail-edge house: the fence line facing the tracks, the garage foundation and any debris or lumber stacked against either.
• Every house: lidded carts, pet food indoors and branches cut back from the roof.

Wildlife and rodent months around the park

January and February are mating months for raccoons and skunks, and the first weeks when raccoons tear into attics and skunk odor seeps through foundation walls. March through May brings raccoon kits in chimneys and attics, fresh skunk dens under stoops, and termite swarms on warm afternoons after rain. May and June are when young skunks are born, so den exclusions need extra care. Rail-edge burrows become obvious as soon as the snow melts.

Summer shifts attention to the lawns nearest the park, where raccoons and skunks dig for grubs, and to hot kitchens, where German cockroach numbers peak in multi-unit buildings. Yellowjackets build under eaves and stoops in August. September and October bring the rodent push, with rats moving closer to houses and mice entering basements. Raccoons slow down in the coldest weeks of winter but do not hibernate, and they will reuse an attic den year after year if the opening is never closed.

A prevention list split by distance from the park

Owners facing the park should put the wildlife steps first and do them in late winter, before females pick den sites. Owners on interior blocks and near the tracks should lead with rodent and roach steps, finishing the sealing by the end of September. An open garbage cart helps every pest on this list, feeding raccoons on the park blocks and rats on the rail blocks alike, so latching lids is the one step everyone shares. Owner-occupants with a tenant upstairs should share the list so habits match the work done on the building.

• Cap chimneys and swap weak roof vents for steel-guarded models.
• Bury hardware-cloth skirts around porches, decks and sheds.
• Strap or lock cart lids and keep carts tight against the garage.
• Feed pets indoors and take feeders down if raccoons are emptying them.
• Prune limbs that let raccoons and squirrels step onto the roof.
• Patch cracked garage slabs and replace worn door seals.
• Clear lumber and debris away from fences facing the tracks.
• Seal utility penetrations with copper mesh and mortar before October.
• Book roach treatment for both units of a two-flat on the same day.

What a visit looks like on these blocks

For wildlife, a specialist walks the property, studies the roofline, chimney and foundation, and asks when and where you hear or smell the animal. They check for young before planning any removal and explain the Illinois rules they work under. Rat calls start behind the house, at the garage apron and the fence line, and for homes near the Belt Railway the inspection often extends along the property edge facing the tracks. For roaches in a two-flat, expect a request for access to both units. Follow-up visits are normal for all three, and an animal loose inside the living space usually moves a job to the front of the schedule when someone is free.

Two details help the provider plan. First, say whether the house faces the park or sits several blocks in, since that tells them whether to bring exclusion materials, rodent stations or both. Second, mention any earlier repairs, such as a chimney cap that blew off or a stoop that was patched, because raccoons and skunks return to openings they have used before and old fixes often fail in the same spot. Ask for a short written list of entry points found so you can track repairs through the next season.