You get chiggers by walking through vegetation where their larvae are waiting on grass blades, leaves, or low-growing plants. The tiny mites climb onto your skin, crawl to a sheltered spot, and begin feeding on your skin tissue. Only the larval stage bites humans, and the process starts the moment you brush against infested vegetation in warm, humid conditions.
Where Chiggers Live
Chiggers thrive in vegetation-shaded soil with decent humidity. The most common spots include overgrown grassy fields, weedy patches, briar thickets, and the edges where wooded areas meet open paths or lawns. Some species prefer drier, disturbed upland areas. Others favor moist habitats like swamps, bogs, and the ground around rotten logs and stumps.
One thing that surprises people is how patchy their distribution can be. You might walk through one stretch of tall grass and pick up dozens, then pass through an identical-looking area nearby and encounter none. They tend to cluster in specific micro-habitats rather than spreading evenly across a landscape. Well-maintained turfgrass and landscaped yards are much less likely to harbor chiggers, though they can still turn up in home lawns that border wilder areas.
When They’re Most Active
Chiggers are most active on warm afternoons when ground temperatures sit between 77°F and 86°F. They become sluggish and inactive below 60°F, and temperatures below 42°F kill the biting larvae outright. They also avoid surfaces hotter than 99°F, which is why you’re less likely to pick them up on sun-baked pavement or bare dry soil. In most of the United States, peak chigger season runs from late spring through early fall, with the worst months being June, July, and August.
How They Get on You
Chigger larvae don’t jump or fly. They wait on the tips of grass blades and low vegetation in a behavior called “questing,” holding on with their back legs while their front legs reach outward. When you brush past, they grab on and start crawling upward along your body, looking for a place where skin is thin or where clothing fits snugly against the body.
That’s why chigger bites tend to cluster around ankles, behind the knees, along the waistband, in the groin area, and around the elastic edges of underwear or socks. They’re drawn to spots where clothing presses against skin, creating a warm, protected environment. The larvae are incredibly small (less than 1/150 of an inch), so you won’t feel them crawling.
What Happens When They Bite
Contrary to popular belief, chiggers do not burrow into your skin or suck your blood. What actually happens is more unusual. Once a larva finds a good feeding spot, it pierces the skin and releases digestive enzymes that dissolve and kill surrounding skin cells. Those dead cells harden into a tiny tube called a stylostome, essentially a biological straw that the chigger uses to drink liquefied skin tissue. The chigger stays attached to the surface, feeding through this tube for hours if left undisturbed.
Your body’s immune response to the enzymes and the stylostome is what causes the intense itching, redness, and raised bumps. The reaction typically builds over several hours after the bite, which means the itching often doesn’t peak until the chigger has already finished feeding or been knocked off. The red welts can persist and itch for one to two weeks as your body breaks down the remaining stylostome material in the skin.
Why You Don’t Notice Right Away
The delay between exposure and symptoms is one of the most frustrating things about chigger bites. Because the larvae are nearly invisible and their initial attachment is painless, most people don’t realize they’ve been bitten until hours later when the itching begins. By that point, the chiggers may already be gone. This lag is also why many people mistakenly believe chiggers have burrowed under the skin: the bites keep itching long after the mites are no longer present, which makes it feel like something is still in there.
How to Avoid Picking Them Up
Prevention comes down to three strategies: avoiding their habitat, creating barriers, and washing promptly after exposure.
- Stay on clear paths. Stick to the center of trails and avoid brushing against tall grass, weeds, and overgrown edges. Sitting directly on the ground in grassy or wooded areas is a common way to pick up large numbers at once.
- Treat clothing with permethrin. A 0.5% permethrin solution applied to clothing repels and kills chiggers on contact. Treat pants, socks, and shoes 24 to 48 hours before you plan to wear them so the fabric has time to dry. Permethrin should never be applied directly to skin.
- Use insect repellent on skin. DEET-based repellents applied to exposed skin, especially around ankles, wrists, and the waistline, provide a second layer of defense. Concentrations around 25% to 50% are effective; going higher than 50% doesn’t add meaningful protection time.
- Tuck clothing in. Tucking pant legs into socks and shirts into waistbands forces chiggers to crawl over treated fabric rather than reaching bare skin directly.
What to Do After Exposure
If you’ve been in chigger-prone areas, the single most effective step is showering with soap and water as soon as possible. Scrubbing with a washcloth helps dislodge larvae that haven’t yet attached or are still in the early stages of feeding. The sooner you wash, the fewer bites you’ll end up with. Washing your clothes in hot water also kills any larvae clinging to fabric.
For bites that have already developed, over-the-counter anti-itch creams and antihistamines can help manage the itching. The welts look alarming but are a normal immune reaction, not a sign of infection. Scratching is the main risk, since broken skin can let bacteria in and lead to secondary infection. Keeping the bites clean and resisting the urge to scratch speeds up healing considerably.
Reducing Chiggers Around Your Yard
Keeping grass mowed short and removing leaf litter, brush piles, and weedy overgrowth makes your yard far less hospitable to chiggers. They depend on shade and humidity at ground level, so opening up airflow and letting sunlight reach the soil disrupts the conditions they need. Transitional zones between your lawn and wilder areas (fence lines, the edges of woods, borders of garden beds) are the most important spots to keep trimmed. Because chigger populations cluster in pockets rather than spreading uniformly, even modest landscaping changes can eliminate the specific spots where they concentrate.