No-see-ums are present throughout Michigan, with at least 85 documented species of biting midges in the state and potentially dozens more based on regional distribution patterns. These tiny flies, often smaller than 3 millimeters, are most active near water sources from late spring through early fall and are a persistent nuisance for anyone spending time outdoors near Michigan’s lakes, marshes, and shorelines.
What No-See-Ums Actually Are
No-see-ums belong to the insect family Ceratopogonidae, commonly called biting midges. Michigan hosts species across 24 genera, but the ones most people encounter belong to the genus Culicoides, the group responsible for biting humans and animals. Over 30 Culicoides species have been documented in the state, including varieties adapted to forests, wetlands, and lakeshores.
Their name is earned. At 1 to 3 millimeters long, they’re small enough to pass through standard window screens and nearly invisible in flight. You’ll usually feel the bite before you ever see the insect. The larvae develop in wet or muddy environments, feeding on decaying organic matter in soil, marshes, and the edges of standing water. Any area with moist, organic-rich ground is a potential breeding site.
Where They’re Worst in Michigan
No-see-ums thrive wherever standing water, moist soil, or decaying plant material accumulates. In Michigan, that means the Great Lakes shorelines, inland lake margins, river floodplains, and the extensive wetlands of the Upper Peninsula are prime habitat. Coastal areas where organic debris like seaweed or algae washes ashore after storms create ideal breeding conditions, and waterfront properties on both peninsulas can experience heavy populations.
The Upper Peninsula’s vast stretches of undeveloped marshland, bogs, and forest make it particularly notorious. But lower Michigan is far from immune. Any lakeside campground, riverside trail, or backyard bordering a pond or drainage ditch can host breeding populations. Activity peaks during warm, humid evenings with little wind, typically from late May through September. Dawn and dusk are the worst times, though overcast days can extend their active hours.
What Their Bites Feel Like
A no-see-um bite is disproportionately painful for the size of the insect. Their mouthparts contain four tiny cutting blades that lacerate the skin rather than piercing it like a mosquito. This produces an immediate, sharp burning sensation that’s hard to ignore.
The skin reaction varies from person to person. Some people develop a small reddish welt that fades within hours. Others experience a more significant allergic response with intense itching and swelling that can persist for days. Repeated exposure over a season can either sensitize you further or, in some cases, gradually reduce your reaction. The good news: no-see-ums in the United States are not known to transmit any disease agents to humans. The bites are purely a comfort issue, not a health risk.
One Culicoides species found in Michigan, however, does carry veterinary significance. It has been linked to transmitting epizootic hemorrhagic disease in white-tailed deer, a viral illness that can cause significant die-offs in local deer populations.
How to Keep Them Away
Prevention comes down to two strategies: barriers and repellents.
Standard window and door screens won’t stop no-see-ums. The mesh openings are large enough for them to fly right through. You need specialty screening rated at 20×20 mesh, meaning 20 threads per inch in each direction. This tightly woven fiberglass material blocks most no-see-ums, gnats, and sand flies while still allowing airflow. It’s sold specifically as “no-see-um screen” and is worth installing on porches, screen rooms, or RV windows if you’re near water in Michigan. The same applies to tent mesh: if your camping tent uses standard mosquito netting, no-see-ums will get inside.
For repellents, DEET remains the gold standard. It works well against biting midges at concentrations up to 30 percent, which is the recommended upper limit. Higher concentrations last longer but don’t necessarily repel better. Picaridin is equally effective against no-see-ums and has some practical advantages: it doesn’t dissolve plastics or synthetic fabrics the way DEET can, and it feels less oily on skin. Products with higher picaridin concentrations also cover ticks, which is a bonus for anyone hiking in Michigan’s woods.
Oil of lemon eucalyptus is the most effective plant-based option, but its protection is significantly shorter-lived than DEET or picaridin. Testing has shown it performs comparably to low-concentration DEET for only the first few minutes, then drops off. Products containing 8 to 10 percent of its active ingredient are labeled for no-see-ums, but you’ll need to reapply frequently. It should not be used on children under three.
Beyond what you put on your skin, a few environmental strategies help. Fans on porches and patios are surprisingly effective because no-see-ums are weak fliers and can’t navigate even moderate air currents. Wearing long sleeves and pants during peak activity hours at dawn and dusk reduces exposed skin. Removing piles of decaying vegetation, leaves, or organic debris near your home eliminates nearby breeding habitat, though it won’t affect populations breeding in natural wetlands.
Treating No-See-Um Bites
The burning sensation from a fresh bite responds well to cold. Rubbing an ice cube on the bite for about 30 seconds helps calm the inflammation quickly. Simply pressing firmly on the bite for 10 seconds can also reduce the immediate itch.
For bites that keep itching, calamine lotion or an over-the-counter hydrocortisone cream applied three times a day works for most people. A paste of baking soda and water is a simple alternative. If you’re dealing with multiple bites or a stronger allergic response with widespread itching and swelling, a non-drowsy oral antihistamine like cetirizine or loratadine can help control the reaction from the inside. The key with no-see-um bites is resisting the urge to scratch. Broken skin from scratching is the main way these bites lead to secondary infection, which is the only real medical complication.
No-See-Ums vs. Other Michigan Biters
Michigan has no shortage of biting insects, and telling them apart helps you respond correctly. No-see-um bites produce an immediate burning sting with a small welt, and you rarely see the insect responsible. Mosquito bites cause a raised, round bump that itches but doesn’t burn at onset. Black fly bites, common in the UP and northern lower Michigan, tend to bleed more because they also cut the skin, and they often target the head and neck rather than exposed arms and legs.
If you’re getting bitten at dawn and dusk near water and can’t see what’s biting you, no-see-ums are the most likely culprit. If the bites cluster around your hairline and ears during the daytime, black flies are more probable. Mosquitoes are the equal-opportunity biters that show up at all hours wherever standing water exists.