Water is the reason, cover is the excuse
If you want to understand why a particular yard keeps producing sightings, start with where the water goes after a storm. About 54 inches of rain falls here in a year, onto ground that sits near 337 feet and drains without much slope to help it. That produces persistent damp: the corner behind the shed that never dries, the ditch line at the back of the lot, the strip under a downspout that has been eroding for years. Damp ground supports insects, worms, frogs and toads, which support rodents and small predators, which support snakes. Cover turns that food supply into a residence. A board on wet soil, a stack of pots, a pallet, an ivy bank running up to a wall: each creates a stable humid space where an animal can wait out the heat of a 91F afternoon. The practical consequence is that drainage work counts as snake work. Extending a downspout, filling a low spot and clearing a blocked ditch outlet all reduce the habitat that supports prey. Households in Memphis who fix the water first usually find that everything else on the list gets easier, because the property stops manufacturing food.
The long season and the wet weather spikes
Snake activity here runs roughly March through November, which is a longer stretch than most of the country and worth planning around. March and April bring the first movement as animals leave winter shelter. Early sightings are often on warm hard surfaces, since a cool bodied animal will use a driveway or a patio slab to raise its temperature before hunting. May through September is the working season, with hunting concentrated at the cooler ends of the day once afternoons average 91F. Humidity near 70 percent keeps the ground productive throughout, so there is no midsummer lull in food. The pattern that surprises newcomers is the spike after heavy rain. When saturated soil floods burrows and low shelter, everything moves uphill for a few days, and yards, driveways and foundations see traffic they do not normally get. A cluster of sightings after a soaking week is displacement rather than an infestation. October and November are the shelter search, as animals look for somewhere frost free ahead of lows near 32F. That is the deadline for exclusion. Anything you meant to seal should be finished before autumn, or you risk closing an animal in rather than out.
Crawl spaces in a humid city
The crawl space is where most indoor snake problems in this housing stock begin, and in a wet climate it is a problem worth solving for several reasons at once. Start with why it is attractive. A crawl space under a Memphis house is cooler than the summer air, shaded, undisturbed and frequently damp, and dampness brings insects, which bring rodents. Add an unscreened foundation vent or a hatch that no longer seats and you have an open invitation at ground level. The fix is straightforward but specific. Vents get quarter inch galvanized mesh fastened over the frame rather than stapled to damp wood that will not hold. The access door gets rehung so it closes tight against a solid frame, which is the single most common failure found on an inspection. Penetrations for plumbing and electrical get mesh backed sealant rather than foam alone. The moisture side matters too. A vapor barrier, working gutters and soil graded away from the wall reduce the insect and rodent populations that made the space appealing. Ask for photographs of the sealed points, because this is a space you will never inspect yourself and the record is what lets you check the work in future years.
The yard audit that actually works
Rather than trying to snake proof a whole lot, walk it once with two questions in mind: where can something hide, and where does water sit. Start at the foundation and move outward. Anything within a few feet of the wall matters most, because that is the route indoors. Ivy or ground cover running to the siding hides both animals and openings, so cut back a bare strip you can actually see. Next, look for ground contact. Boards, pallets, pots, unused pavers, spare lumber and firewood all create voids underneath when they sit on soil. Racking them a few inches up removes the void entirely without throwing anything away. Then look for standing water: a low spot that stays soft for days, a downspout dumping against the wall, a clogged ditch outlet at the back of the lot. Each of those is a prey factory in a city that receives 54 inches of rain a year. Finally, look at food storage. Bird seed, pet food and unsecured trash all feed the rodents that feed the snakes. The audit takes half an hour and produces a to do list you can work through over a weekend. It outperforms any product on the shelf.
Getting a reliable answer about species and law
Two questions come up in almost every conversation, and this page answers neither: what venomous species live nearby, and what you are legally allowed to do about a snake on your property. The reason is simple. There is no verified Tennessee species list or regulation data behind this page. A plausible sounding list would be easy to write and someone would use it to decide whether to walk up to an animal, which is exactly the decision that should never be made from a web page. The state wildlife agency is the correct source. Agencies publish species range information, often county by county, along with rules on which snakes are protected and whether a permit is needed to handle or relocate one. Many states protect non venomous species outright and some require authorization even for licensed operators, so assume you may not act until you have checked. The second good source is the licensed operator who visits your property, since identifying these animals is routine work for them. Meanwhile the safe behavior does not depend on the answer: keep several feet of distance, keep pets inside, use a camera rather than your hands, and treat every unidentified snake as one to leave alone.