When Do No-See-Ums Come Out?

Bill Swank
First Published: | Updated: February 27, 2024

If you’ve ever spent a summer evening outdoors only to find yourself covered in itchy, red welts despite not seeing any insects around, then you’ve probably met the ubiquitous and formidable ‘no-see-um’. These tiny pests can disrupt peaceful outdoor activities with their almost invisible presence and painful bites. To help prevent these unwelcome interruptions, we’ve put together this comprehensive guide which answers the common question: “When do no-see-ums come out?”.

In this article, we’ll dive deep into understanding no-see-ums – where they are found, their prevalence in various states, their activity periods, and how to navigate their presence. These insights will equip you with the knowledge to safeguard yourself, your home, and your community from the menace of no-see-ums.

  • No-see-ums, also known as biting midges, are small winged insects whose bites can cause skin irritation and itching. They typically thrive in warm, humid environments with access to bodies of water and are prevalent globally, with significant populations in the Southeastern US.
  • These tiny pests are most active around dawn and dusk when they seek a blood meal. Their peak season often aligns with the warm weather and is more pronounced in humid regions or those with heavy rainfall. In general, the summer season is the worst for no-see-um infestations.
  • Identification of no-see-ums is typically linked to the itchy, red welts their bites leave behind rather than spotting the insects themselves. Bites are particularly likely during early morning or evening hours in areas close to stagnant water bodies.
  • To mitigate the presence of no-see-ums, take steps to eliminate standing water around homes or communities, prevent their entry by using screens on windows and doors, and use fans to create airflow as the insects struggle in strong winds. Personal protective measures include covering the skin and using insect repellents when outdoors during their peak activity periods.
  • Understanding the habitats, active periods, and habits of no-see-ums can aid greatly in managing and controlling their impact. The combination of staying informed, adopting preventive measures, and using specific pest control products can help create a no-see-um-free environment.

Table of Contents

What Are No-See-Ums and Where Are They Found?

What are no-see-ums?

No-see-ums, also known as biting midges, are a type of small, winged insect. These minute creatures are only about 1 to 3 mm long, often leaving their victims wondering what just bit them – hence the nickname ‘no-see-ums’. Despite their size, these little pests can deliver a painful bite causing skin irritation and intense itching.

What is the habitat of no-see-ums?

No-see-ums thrive in warm, humid environments, with access to water bodies such as rivers, lakes, or marshes for their larval development. So if you live near such environments, be on the lookout.

Where do no-see-ums live on a global scale?

No-see-ums are found in nearly every part of the world, from tropical regions to temperate zones. They’re especially prevalent in coastal areas or waterlogged regions.

What is the geographic range of no-see-ums, and where are they typically found in the United States?

Within the United States, no-see-ums are common across various states. They’re quite prominent in Southeastern states particularly near the Gulf Coast. However, sightings have been reported in other regions as well, largely due to the varying species and their diverse habitats.

How Are No-See-Ums Experienced in Various States and Regions?

How prevalent are no-see-ums in Florida?

In Florida, no-see-ums are a common nuisance, especially during the warmer months. Given Florida’s subtropical climate and abundant water bodies, it’s almost a haven for these tiny critters. Lakes, rivers, and marshes found across the state provide the perfect breeding grounds for no-see-ums.

What is the status of no-see-ums in other southern states such as Texas, Alabama, and Georgia?

No-see-ums aren’t just restricted to Florida. Other southern states, like Texas, Alabama, and Georgia also experience their share of no-see-um problems, particularly during the summer season. Damp, warm conditions, typical of these states, support the breeding and growth of no-see-ums.

How are no-see-ums distributed in Midwest states like Michigan, Ohio, Indiana, and Wisconsin?

In Midwest states, no-see-ums aren’t as prevalent due to the cooler, drier climate. However, they do make an appearance occasionally, especially during the humid summer months. Areas close to lakes and other water bodies may experience a higher frequency of no-see-ums.

What is the occurrence of no-see-ums in western states like Arizona, Oregon, and California?

In states like Arizona, the dry desert climate keeps the no-see-ums at bay. On the other hand, the coastal regions of Oregon and California can have modest no-see-um populations due to the proximity to water bodies.

When are no-see-um bugs the worst in the Caribbean?

These pests are particularly problematic during the rainy season, which typically spans from May to October, when the increased humidity and standing water provide ideal breeding conditions.

How are no-see-ums found in eastern and other states like Virginia, Tennessee, Missouri, Minnesota, and Maryland?

Eastern states and others, such as Virginia, Tennessee, Missouri, Minnesota, and Maryland, vary in their experience with no-see-ums. Places with frequent rainfall or high humidity levels may experience more no-see-um activity, whereas the drier, colder regions may see less.

When Are No-See-Ums Most Active?

When do no-see-ums come out?

No-see-ums typically come out and are most active during dawn and dusk. This is when they go out in search of a blood meal. However, it’s not uncommon to find some species of no-see-ums active during other parts of the day or night, especially in heavily infested areas.

Do no-see-um bugs appear in winter or summer?

No-see-ums are primarily a problem in the warmer months, particularly in summer, as they thrive in warm, humid conditions, although some species can remain active in milder winter climates.

What time of the day does no-see-ums come out?

As previously mentioned, no-see-ums are typically active during dawn and dusk. Still, particular species might display different behavior depending on environmental conditions and availability of hosts.

What is the worst time for no-see-ums?

The worst time for no-see-ums is typically the summer season, particularly around June and July. During this time, many states experience increased humidity and rainfall, providing the perfect conditions for no-see-ums to breed and thrive.

When does the no-see-ums season occur, and how does it vary across different states?

The no-see-ums season usually aligns with warmer weather when the weather conditions are favorable for their reproductive process. This could start as early as the spring in warmer states like Florida and Texas, while on the contrary, states with cooler climates might not see noticeable no-see-um activity until the height of summer.

What are the peak seasons for no-see-ums in places like Florida, Michigan, Texas, and Ohio?

In Florida and Texas, the peak season for no-see-ums starts from spring and can extend till late fall. Contrarily, in states like Michigan and Ohio, the peak season is usually during the height of summer, around June through August.

How do weather conditions in different states like California, Indiana, Minnesota, and Wisconsin impact no-see-ums’ activity?

Weather conditions greatly influence the activity of no-see-ums. Mild to warm temperatures along with ample rainfall or water sources can result in increased no-see-um activity. So, states like California, Indiana, Minnesota, and Wisconsin may see a spike during their warmer, wetter months.

What Are the Consequences and Challenges Associated with No-See-Ums?

How to identify no-see-ums?

Given their tiny size, no-see-ums can be difficult to identify with the naked eye. Common signs of their presence include the tiny, itchy, red welts they leave behind after feeding. Their bites often itch intensely, and the discomfort can last for several days. You’re likely dealing with no-see-ums if you’re getting bitten during early morning or evening hours, especially in and around areas with stagnant water bodies.

What are the worst times for encountering no-see-ums, and how can they be avoided?

The worst times for encountering no-see-ums are during their most active periods – typically early morning and late afternoon or evening. Avoid being outside during these times if possible. If you must be outdoors, try to cover up as much skin as possible, and use an insect repellent containing DEET or Picaridin for additional protection.

When do no-see-ums typically go away, and what can be done to mitigate their presence?

No-see-ums usually start to disappear as temperatures drop, typically in late fall. However, in warmer climates, they may linger year-round. To mitigate their presence, eliminate areas of standing water around your home since these serve as breeding grounds.

Do no-see-um bugs survive the winters?

In colder climates, no-see-ums go dormant or die off, reducing their activity until warmer temperatures return in the spring. Using screens on windows and doors can help keep them from entering your home. Fans can be effective too, as no-see-ums have difficulty flying in strong winds.

How to Navigate and Adapt to the Presence of No-See-Ums?

What are the key takeaways from the distribution and seasonality of no-see-ums?

The key takeaways are that no-see-ums are most active in warmer, humid climates, especially during dawn and dusk. Their presence is widespread throughout the globe, though they’re especially prevalent in the US, particularly in the Southeast.

When do no-see-um bugs appear in homes?

These insects are known to invade indoor spaces, especially during their peak seasons, seeking moisture and hosts, even entering through fine screens.

How can individuals and communities prepare and adapt to the presence of no-see-ums?

By recognizing the signs of no-see-ums and taking preventive measures, individuals and communities can effectively mitigate the impact of these pests. These include eliminating sources of standing water, using repellents during active hours, and installing quality screens on windows and doors.

Dealing with No-See-Ums: Solutions and Control Methods

After understanding when no-see-ums are most likely to come out, it becomes essential to know how to get rid of them. The best way to tackle this issue is by adopting specific control measures tailored to eradicate no-see-ums effectively. For comprehensive strategies on managing these pesky insects, visit this detailed guide on no-see-um control. Whether it’s adopting preventive measures or using specific products, this guide will help you enjoy a no-see-um-free environment.


No-see-ums are present across different regions, to varying degrees, and can pose a nuisance with their bites. Learning their habitats, active periods, and adapting to their presence can help you manage and control the impact of these tiny pests effectively. Remember, staying informed is the first step to keeping your home and community no-see-um free.

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