Midges are most effectively repelled using DEET-based repellents on skin, permethrin-treated clothing, and strategic timing to avoid peak biting hours at dawn and dusk. But a layered approach works best, because these tiny insects are persistent and can slip through defenses that stop larger biting flies. Here’s what actually works, what works less well than people think, and how to make your time outdoors far more comfortable.
Why Midges Find You
Biting midges locate hosts using a combination of carbon dioxide from your breath, lactic acid from your sweat, and a compound called octenol that mammals naturally exhale. Carbon dioxide is the primary long-range attractant, drawing midges from a significant distance. Once closer, body odors and heat guide them in. This is why some people seem to attract more bites than others: individual differences in sweat composition and CO2 output genuinely matter.
Understanding these cues helps explain why certain repellent strategies work. Anything that masks your CO2 plume or the chemical signature of your skin gives midges less to home in on.
When Midges Are Most Active
Biting peaks at dawn and dusk and can continue through the night. Midges rarely bite during the day unless it’s overcast with little wind. They’re weak fliers, and wind speeds above roughly 6 mph are enough to ground them or prevent them from landing on you. This means a breezy hilltop is a far better picnic spot than a sheltered glen near standing water, and a simple fan on a porch or patio can create enough airflow to keep them away.
If you can schedule outdoor activities for midday on sunny, breezy days, you’ll avoid the worst of it without needing any repellent at all.
DEET: The Most Reliable Repellent
DEET remains the gold standard for skin-applied midge repellents. In a head-to-head field test against biting midges in Honduras, DEET formulations provided 96% to 98% protection compared to untreated skin. Higher concentrations don’t repel more effectively, but they do last longer. A 20% to 30% DEET product covers most outdoor situations lasting a few hours. For extended exposure, 30% to 50% extends protection time without needing frequent reapplication.
Apply DEET to exposed skin and avoid spraying it on clothing, as it can damage synthetic fabrics and plastics. It’s safe for children over two months old when applied by an adult, and washing it off when you head indoors is a good habit.
Oil of Lemon Eucalyptus as an Alternative
If you prefer a plant-derived option, oil of lemon eucalyptus (the refined version containing PMD) is the strongest botanical repellent with regulatory backing. Products with 8% to 10% concentration protect for about two hours, while those with 30% to 40% concentration extend that to around six hours. That puts higher-concentration lemon eucalyptus products in a similar protection window to moderate DEET formulations, though they typically need reapplication sooner in heavy midge conditions.
One important limitation: oil of lemon eucalyptus should not be used on children under three years old. For young kids, DEET or picaridin-based products are the recommended alternatives.
Why Skin So Soft Falls Short
Avon Skin So Soft has a persistent reputation as a midge repellent, but the science tells a more nuanced story. In controlled testing against biting midges, it provided about 71% protection, significantly less than the 96% to 98% achieved by DEET. More telling, the product didn’t actually repel midges at all. It worked by trapping them in its oily film before they could bite. That’s a meaningful difference: once the oil layer thins or rubs off, protection drops quickly. It’s better than nothing, but if you’re heading into serious midge territory, it’s not a substitute for a proper repellent.
Clothing and Permethrin Treatment
Midges can bite through thin, tight-fitting fabric, so your clothing choices matter. Loose-fitting, long-sleeved shirts and long pants in light colors create a physical barrier that midges struggle to penetrate. Tightly woven fabrics work best. Head nets with a fine mesh are essential in heavy midge areas, as standard mosquito netting often has gaps large enough for midges to pass through.
Treating clothing with permethrin adds a chemical layer of defense. Permethrin kills or repels biting insects on contact with treated fabric, and the treatment survives multiple washes. You can buy pre-treated clothing or apply permethrin spray to your own gear. It’s particularly useful for hats, socks, and pant cuffs, which are the edges where midges tend to find their way to skin. Permethrin should only go on clothing and gear, never directly on skin.
Combining permethrin-treated clothing with a DEET or lemon eucalyptus repellent on exposed skin gives you the strongest personal protection available. This two-layer approach is what works best in places with heavy midge populations.
Reducing Midges Around Your Yard
Midges breed in moist soil, decaying vegetation, and shallow standing water. Reducing these breeding sites around your property makes a real difference over time. Clear leaf litter from gutters, drain any containers that collect water, and avoid overwatering garden beds. Compost piles and thick mulch near seating areas can be midge nurseries.
For immediate relief in outdoor living spaces, fans are surprisingly effective. A couple of oscillating fans on a deck can create enough airflow to keep midges from landing, since they can’t fly well in anything above a light breeze. This is one of the simplest and most underrated midge control strategies. CO2-baited traps can attract midges from up to 55 to 70 meters away, potentially reducing local populations, but they work best as one part of a broader approach rather than a standalone solution.
Layering Your Defenses
No single method eliminates midge bites entirely. The most effective approach stacks multiple strategies together. Time your outdoor activities for midday when possible. Choose breezy, open locations over sheltered, shaded spots near water. Wear loose, long clothing treated with permethrin. Apply DEET or lemon eucalyptus to any exposed skin. Set up a fan if you’re stationary.
Each layer on its own provides partial protection. Together, they make a dramatic difference. People who live in heavy midge areas, like the Scottish Highlands, coastal marshes, or lake regions, typically settle into a routine that combines three or four of these methods and find that midge season becomes manageable rather than miserable.