Skunks Under the Deck or Porch in Colorado: Humane Removal and Permanent Exclusion

Across the Front Range, from Lakewood to Fort Collins to Colorado Springs, skunk calls spike sharply in February and March. By the time a homeowner notices the smell under the deck, the animal has usually been denning there for weeks. Skunks move quietly, forage at dusk, and return before sunrise. The only announcement is what happens when something startles them at close range.

Colorado's climate actively works in the skunk's favor for finding den sites. The freeze-thaw cycles that fracture old concrete aprons, shift foundation skirting, and open gaps in deck framing happen every winter across most of the state. Each spring, skunks investigate those new openings. A striped skunk can squeeze through a gap as small as 4 inches in diameter. Older decks and front porches are particularly vulnerable, especially those where the lattice skirting is cracked, missing, or never properly anchored to grade.

Why Colorado Decks and Porches Are Attractive Den Sites

Colorado's skunks look for three things in a den: overhead cover, ground-level access, and soft or disturbed soil they can scrape into a shallow sleeping hollow. The enclosed underside of a deck or porch checks all three boxes. To a skunk, it functions the same way a rock outcropping or a hollow log would in the wild.

The striped skunk (Mephitis mephitis) is the species found throughout Colorado, from the urban neighborhoods of Denver and Aurora to the foothills communities near Boulder. They are generalist foragers: insects and grubs make up the bulk of their diet in warmer months, and they are drawn to structures near bird feeders, vegetable gardens, or compost bins where food is close at hand. A deck adjacent to a drip-irrigated garden bed offers both shelter and a reliable food source within yards of the den entrance.

Colorado's lower humidity helps too. Dry soil under a deck stays loose and easy to scrape, and concrete piers create sheltered corners that stay frost-free on cold nights. Add the deer mice, voles, and beetles that overwinter in the same areas, and the skunk has food within yards of the den entrance. The structure practically recruits them.

Denning Season in Colorado: The Window That Matters Most

Colorado skunks establish their most persistent dens from late January through mid-May. According to Colorado Parks and Wildlife (CPW), this window covers mating season, which peaks in February, followed by a gestation period of roughly 60 to 75 days, and then the birth and nursing period for kits, typically running late April through May.

A female skunk nursing young in late April is not going to vacate because you stomped on the deck boards or flooded the area with a flashlight. She has 4 to 7 kits depending on the animal. Cornering a mother near her young is the scenario most likely to result in a direct spray. The spray itself is a thiol compound, meaning sulfur-based, and it delivers an accurate stream up to 10 feet. On wood, concrete, or fabric in Colorado's dry air, the odor can persist for days even with treatment.

Outside the denning peak, roughly late summer into early fall, skunks behave differently. They are ranging widely to build fat reserves, and a skunk under a Denver area deck in September is more likely resting temporarily than raising a family. Timing a removal for August or September, when no kits are present, makes the job faster and lower-risk. CPW guidance on nuisance wildlife is available at cpw.state.co.us.

Is a Skunk Actually Living There? Signs That Tell You

A single strong smell does not mean a resident animal. Skunks sometimes spray during a territorial encounter with a neighbor's cat, then move on. Confirming a resident skunk before acting saves time and avoids unnecessary disturbance.

Look for these signs across multiple days:

• A shallow scrape or depression near one specific entry point. In Colorado's sandy or clay soils this is usually easy to spot.
• Tracks in soft soil or dust: five toes on both front and rear feet, with visible claw marks, and a slow waddling stride.
• Small conical holes in the lawn, 2 to 3 inches across. Skunks dig for grubs with a distinctive rotary motion unlike any other Colorado yard pest.
• A persistent musky odor returning to the same spot each morning, even days after no visible activity.
• Disturbed mulch or debris along the foundation edge.

Three or more of these signs from the same location over multiple days means a resident animal. That changes what you do next.

What Does Humane Removal Actually Look Like?

Humane exclusion, which means sealing the entry points so the animal exits on its own and cannot return, is the standard approach. It avoids direct contact with the skunk, requires no trapping, and carries almost no spray risk for anyone on site.

A one-way exclusion door, sometimes called a one-way flap or eviction device, is installed over the primary entry point. When the skunk leaves to forage at dusk, the door lets it push out. When it tries to return, the door blocks re-entry. Over 3 to 7 nights, the animal moves on. The exclusion device is then removed and the entry sealed permanently.

One step that cannot be skipped: confirming there are no kits before installing the door. Kits that cannot yet follow the mother out will be trapped inside. An experienced technician checks activity patterns across multiple days before staging the device. If kits are present, the timeline shifts until they can follow the female on their own, typically around 8 weeks of age.

Colorado Parks and Wildlife classifies striped skunks as a nongame species. Licensed operators work within CPW rules on live trapping and relocation, which vary by county. A licensed technician will know the current rules and carry the right transport equipment.

When Live Trapping Is Necessary

Exclusion handles most cases cleanly. Live trapping becomes necessary when den access is spread across multiple entry points, when the structure's design does not allow a one-way door, or when local ordinances in an area like Thornton or Westminster require physical removal. It is the higher-risk option because it requires a human to approach and transport a confined animal.

One thing worth knowing: a skunk can spray from inside a wire cage trap. The spray mechanism is muscle-driven and works regardless of body position. Professional trappers use dark-sided box traps and cover them with heavy cloth before transport; darkness reduces agitation. Spray contact during live trapping is more common than during exclusion, which is the main reason exclusion comes first.

Skunk removal on the Colorado Front Range generally falls in the $150 to $500 range, depending on the number of animals, access difficulty, and whether sealing is included. A free on-site inspection is the only way to get an accurate figure.

The Rabies Risk: What Colorado Homeowners Should Understand

Striped skunks are one of the primary terrestrial rabies vector species in the United States, according to the Centers for Disease Control and Prevention (CDC). Colorado Parks and Wildlife reinforces this in its nuisance wildlife guidance. That is a fact worth knowing, not a reason to panic. It shapes how to read the animal's behavior.

A healthy skunk is nocturnal, foraging after dusk and returning before sunrise. A skunk active in daylight, circling, or showing no fear response warrants a call to CPW or local animal control. Do not approach it, and keep children and pets inside.

A skunk bedding quietly under your Arvada deck, leaving at dusk and returning before dawn, is behaving normally. The practical risk is low provided no direct contact occurs. Colorado law requires rabies vaccination for dogs; it is strongly recommended for outdoor cats. Any contact between a pet and a wild skunk, including a bite, warrants an immediate call to your veterinarian regardless of vaccination status.

Sealing the Cavity Permanently: What Good Work Looks Like

Getting the skunk out is the first half of the job. A cavity that housed one skunk will attract another within the same season if the entry points are not sealed. Skunks follow pheromone traces left in nesting material. Closing every gap and clearing the debris is what prevents a repeat call.

Permanent exclusion for a Colorado deck or porch typically involves some combination of the following:

• Heavy-gauge galvanized hardware cloth: 1/4-inch to 1/2-inch welded wire mesh buried at least 12 inches below grade and turned outward in an L-shape. This stops animals from digging under the barrier. Chicken wire is not a substitute because it corrodes and tears within a few Colorado winters.
• Concrete apron or poured mortar: Applied along foundation edges where skirting meets grade, particularly useful where the freeze-thaw cycle has opened gaps or left a depression from a previous burrow.
• Reinforced lattice skirting: Decorative lattice alone is not an animal barrier. Back it with hardware cloth or replace it with a solid ventilated panel. Many Front Range homes have lattice that has been cracked by heavy snow loads or shifted by frost heave.
• Polyurethane foam backed with hardware cloth: For smaller gaps around utilities or vent frames. Foam alone is not enough because rodents and larger wildlife will chew through it.

A properly installed hardware cloth barrier should hold for 10 years or more with only an annual visual check. Before sealing, the technician removes nesting debris to eliminate pheromone traces and clear out the ectoparasites, mites and fleas, that skunks carry in their bedding.

Frequently asked questions

Related reading

• Wildlife Removal Costs in Colorado
• What Is That Scratching in Your Attic?
• How Wildlife Gets Into Your Home