Idaho wildlife control: The Complete Homeowner's Guide

What to look for

With roughly 12 inches of rain a year and humidity near 58%, Idaho wood does not get soft; it checks along the grain, shrinks away from nails, and lets sun and wind widen every joint. Fascia corners open, soffit panels sag, shed skirting splits. A squirrel needs only a split to chew; a bat needs a gap the width of a finger. The rules are the West's. Idaho sits far outside the USDA raccoon rabies bait zone that ends in Alabama, so raccoons here are not the vector they are in the East; bats, which the CDC puts at 35% of rabid animals nationally, and skunks are. Median home values near $360,000 mean the wiring and insulation in the way are worth protecting. Idaho's wildlife problems come in two waves because its climate has two extremes and almost no rain to soften either. Summer: the state's cities run a median high near 89F, and an attic under a dark roof runs hotter than that. Bats want exactly that heat for raising pups, so from late spring through August colonies settle behind fascia, in soffits and against the ridge in homes from Nampa to Lewiston. Winter: the median low is about 23F, and the same attic becomes the best insulated cavity on the lot. Squirrels move in from October, raccoons take attics and chimneys, and skunks, which do not climb, dig under decks, sheds and crawlspace skirting where the ground stays a few degrees warmer. The dryness decides the entry.

• 1Bats leaving from one spot on the fascia at dusk in July, with dry, crumbly droppings on the siding below.
• 2A dark, greasy smear at a soffit joint, the oil from bats squeezing through the same gap nightly.
• 3Chewing or a rolling sound in the ceiling that started in October and happens at first light.
• 4Skunk odor around a deck, a shed or a crawlspace vent, worst on still, cold nights.
• 5A hole dug under shed skirting with fresh dirt kicked out behind it.
• 6Insulation tunneled into runs, the squirrel's highway across the attic.
• 7Heavy footsteps overhead after dark, and whimpering in March or April from raccoon kits.
• 8A fascia board that has cupped away from the roof edge, with tooth marks widening the gap.

Treatment options and typical costs

Prices are typical published ranges. Ask what’s included before you compare quotes.

Why Idaho attics get two different tenants a year.

When a provider quotes an exclusion, ask whether the timing is chosen for one tenant or both. A roofline sealed in April, after the squirrels are out, has a bat colony testing it by June. The practical point is that an Idaho roofline sealed in late August, after the bats leave and before the squirrels arrive, solves both seasons with one job. Raccoons take the chimney or a larger hole; skunks, who cannot climb, dig under the deck. In fall the same gaps are the warmest openings a squirrel finds, because the attic below is now the best insulated cavity around, and the squirrel widens the bat gap with its teeth. By late August the pups fly and the colony thins. They enter through gaps a finger wide at the fascia and soffit, roost against the ridge, and leave the guano below. In summer, a dark roof over a poorly vented attic runs well above the outside air, and bats raising pups want that heat. Both animals are after the same thing, the most extreme temperature on the lot, and the attic delivers it in both directions. The 66-degree spread between Idaho's median summer high of 89F and median winter low of 23F is why the same attic in Boise or Pocatello can host a bat colony in July and a squirrel family in January.

wildlife activity by season.

Scheduling before the busy stretch, rather than after it, tends to mean faster service and a more accurate quote, and a local provider can point out the conditions that matter most in Idaho. In Idaho, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure usually turns up the conditions that are letting them in. The most useful first step in Idaho is to note where you have seen wildlife and when they appear, because that timeline is what lets a provider focus on the right area instead of treating the whole property.

Bats are Idaho's rabies question, and what that means at home.

After the health call, the wildlife call: a bat in a bedroom means a colony somewhere above it, and the fascia gaps that let it in need a late-summer exclusion once the pups can fly. Thick gloves and a box are for the provider or the health district, not the homeowner. Testing needs the bat, so the useful move is to keep it in the room, with the door shut, and let the health district say what to do next; letting it out the window throws away the test. Because a bat's bite can go unnoticed on a sleeping person, the CDC's approach is to treat that as a possible exposure, and the public health district decides whether the bat gets tested or the person gets the vaccine series. The problem is the single bat that finds its way down a wall cavity into a bedroom in Meridian or Coeur d'Alene during the summer, and is found in the morning. A colony in the attic is not an exposure; nobody is being bitten in the attic. Idaho sits outside the USDA raccoon bait zone that ends in Alabama, and the CDC puts bats at 35% of rabid animals found nationally, so in an Idaho home the bat is the animal to take seriously. In the East the raccoon is the rabies animal; in the central states it is the skunk; in the Northwest and much of the intermountain West it is the bat.

What happens to the skunk under your Idaho deck.

Pets stay off the deck until the provider has been, and a skunk out in daylight or stumbling gets a health district call rather than a wildlife call. Once the skunk is out, hardware cloth goes a foot down along the skirting and bends outward, and that has to wait for thaw if the job starts in January. The removal is half the job. A licensed Idaho operator sets a cage at the skirting gap, checks it on the interval the license sets, and handles the animal within the rules; you should hear those rules explained before the cage goes out, and if a provider in Nampa or Caldwell offers to drive the skunk out to the desert, ask whether that is actually permitted. The CDC reports that skunk rabies dominates the Midwest and West and that more than 20% of skunks that expose a person or pet test rabid, which is why the question of where a trapped skunk goes has an answer written by the state rather than chosen by the homeowner or the provider. The skunk is also the West's rabies-variant animal. Skunks are the second-biggest wildlife call in Idaho after bats, because a deck or shed on a lot with 23F nights is the warmest ground-level den around, and a split skirt board in a 12-inch-rain climate is the door.

What the first visit looks like in an Idaho dry-climate home.

A flat number on one line is a quote for a cage, and the next season's tenant will be in through the joint that was not on the list. And if attic restoration is proposed, it should carry square footage and photos. It should state the trap-check interval and disposition for a skunk. It should give the timing, because in Idaho the right month depends on which tenant is in residence. The report should mark every joint to be refastened and screened, by location, and say which one gets the one-way door or tubes. In the attic they read what is there: dry, crumbly bat guano in a line under the ridge, or tunneled insulation and gnawed wiring from squirrels, or a raccoon latrine in a corner; from March on they look for young. On the ground they check deck and shed skirting for splits and fresh digging. They are looking for fascia that has cupped away from the roof deck, soffit panels that have dropped at one end, gable vents with shrunk frames, and the dark oil smear that marks a bat gap. The provider starts outside with a ladder and works the whole perimeter, not just the corner where the noise is. A wildlife inspection on a house in Twin Falls or Idaho Falls is mostly a roofline inspection, because in a climate with 12 inches of rain the roofline is where the wood has moved.

Renters and landlords: who calls in Idaho.

The landlord's provider comes after. The one situation that does not wait for a landlord is a bat found in a bedroom: the tenant calls the health district that morning, keeps the bat if possible, and the CDC's figure of about 1.4 million exposure evaluations a year is the reason nobody argues about the lease first. For landlords with several units, one August walk along the rooflines with a drill and a roll of hardware cloth is the cheapest wildlife work in Idaho, and it covers both seasons at once. Put the date, the time of day and the sound in the message. A tenant in Pocatello who writes that something is chewing at first light in November has described a squirrel and a one-way door before the March litter. A tenant in Boise who writes that bats are leaving the fascia at dusk in July has told the landlord the job is a late-summer exclusion with a maternity window to respect. Precision matters here more than in most states because the species changes with the season. The tenant's job is to report it quickly and precisely. In most Idaho rentals the owner hires the provider and pays for the removal and the sealing, because a sun-split fascia joint, an unscreened vent or a broken shed skirt is a building condition.

A month-by-month wildlife timeline for Idaho homes.

A homeowner who seals the roofline in late August and buries mesh in September has handled both halves of the Idaho year with one weekend of work. October through December: the squirrel and raccoon move-in as the first frosts land from Coeur d'Alene down to Twin Falls, and skunks start digging under skirting. Late August through September: pups fly, exclusion tubes go up, and the whole roofline is sealed before the next tenant. July and early August: 89F days, pups in the attic, no exclusion; this is the window for refastening and screening every joint the colony is not using. Late May and June: bats arrive at the fascia and soffit gaps as attics warm, and colonies form. March through May: litters arrive in attic dens and one-way doors are set aside for a few weeks; the ground thaws and deck and shed barriers go in. Ladder work is possible on most days; buried barriers wait for thaw. January and February: squirrels and raccoons are settled in attics against 23F nights, skunks are under decks and sheds, and skunk mating odor peaks. Idaho's wildlife year is really two years laid end to end, and the change of tenant is the thing to plan around.

Simple ways to keep wildlife away

• Refasten and screen fascia and soffit joints every August, since Idaho's dry air keeps opening them.
• Watch the roofline at dusk in June; one spot bats leave from is the gap to seal after the pups fly.
• Quarter-inch hardware cloth over every gable, soffit and crawlspace vent, screwed into solid wood.
• Bury mesh a foot down along deck and shed skirting and bend it outward before the ground freezes.
• Cap the chimney with a stainless cap before October; an open flue is a raccoon den at 23F.
• Keep cottonwood and maple limbs eight feet off the roof so squirrels lose the bridge.
• Store bird seed, pet food and garbage in a closed garage; a heated garage is the warmest thing on the block in January.
• Look at the roofline again after the first hard frost, since new gaps open as the wood contracts.

Questions people ask

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