Types of Mosquitoes in Maryland: How to Identify the 3 Most Common Species
September 22, 2026
Maryland harbors an estimated 59 documented mosquito species, according to the University of Maryland Eastern Shore Extension, yet public health officials concentrate their attention on just three. Learning the types of mosquitoes in Maryland that actually matter helps homeowners protect their families from itchy bites and, in rare cases, serious illness. One species turned up at a Baltimore tire yard in 1987 and has since colonized nearly every county in the state, while another quietly breeds in storm drains and catch basins and drives most of the region’s West Nile virus activity.
Each of these mosquitoes has different biting habits, breeding preferences, and disease risks, so recognizing the differences matters more than most people realize. A backyard treatment that knocks down one species may do nothing against another. The sections below cover how to identify Maryland’s three mosquitoes of primary concern, where each one breeds, and what makes them a nuisance or a health risk.
| Feature | Common House Mosquito | Asian Tiger Mosquito | Yellow Fever Mosquito |
|---|---|---|---|
| Coloring | Light to medium brown | Black with white leg and body stripes | Dark with white markings on legs and thorax |
| Active Hours | Dawn and dusk | Daytime | Daytime |
| Preferred Breeding Site | Storm drains, catch basins, stagnant water | Small artificial containers, tires, bottle caps | Small artificial containers near homes |
| Primary Disease Concern | West Nile virus | Dengue, chikungunya, Zika | Zika, dengue, yellow fever |
1. Asian Tiger Mosquito
The Asian tiger mosquito (Aedes albopictus) generates more nuisance complaints in Maryland than any other species. According to the Maryland Department of Agriculture, the Asian Tiger Mosquito is the biggest nuisance in Maryland, and about 60% of complaints refer to Asian Tiger Mosquitoes. That level of frustration comes from its aggressive, all-day biting behavior rather than sheer population size.
Identifying this species is fairly straightforward once someone knows what to look for. Asian tiger mosquitoes are black with silvery white markings, and the best way to identify this species is by the single median silver-white stripe from its head down the center of its back, as well as its striped black and white legs. Unlike most native mosquitoes in the region, Asian tiger mosquitoes typically feed during the daylight hours, unlike many other mosquito species, including the culex, that feed only at dusk and dawn.
This species is not native to Maryland. According to the Maryland Department of Agriculture, the Asian tiger mosquito is an exotic species introduced to North America from Asia that has become a major pest and threat to public health in Maryland, and from an initial discovery in Baltimore City in 1987, it has extended its known range to all Maryland counties except Allegany and Garrett. The Mosquito Squad of Howard and Montgomery County notes that the Asian Tiger was first discovered in Baltimore, Maryland, in 1987 at a used tire processing plant, and from there it spread to nearby communities as buckets, cans, flower vases, and other artificial water-holding containers proved suitable for breeding.
Breeding habits explain why this mosquito thrives in residential neighborhoods rather than wetlands. The Maryland Department of Agriculture reports that female tiger mosquitoes seek water-holding containers in which to lay their eggs, and any container from a tire casing to a tree hole is a possible breeding site. A resource from Calvert County, Maryland adds that this mosquito is unique in that it will only breed in artificial man-made containers, a habit that makes eliminating standing water in yards one of the most effective control strategies available to residents. Seasonal timing follows a predictable pattern each year. Maryland’s own agriculture department reports that tiger mosquito eggs are present year round, larvae appear from April through October, adults are found May through October, and the period of peak population runs June through September. Anyone comparing Maryland’s outdoor insects season by season, including the state’s native caterpillar species, will notice a similar spring-through-fall activity window driven by the same warm-weather triggers.
Pro Tip: Check for standing water in gutters, plant saucers, and tire ruts at least once a week. Asian tiger mosquitoes can complete their entire life cycle in a bottle cap’s worth of stagnant water.
Disease risk is the other reason this species draws so much attention from health departments. The Montgomery County Office of Public Information notes that the CDC has evidence that only two species of mosquitoes in the United States, Aedes aegypti and Aedes albopictus, can serve as vectors of the Zika virus, and UMES Extension confirms that Aedes albopictus mosquitoes transmit diseases such as dengue, chikungunya, and yellow fever.
2. Common House Mosquito / Northern House Mosquito
The common house mosquito, also called the northern house mosquito (Culex pipiens), looks far less dramatic than its striped counterpart but carries a bigger public health footprint in one specific way. According to Western Pest Services, Culex mosquitoes can vary in color, typically appearing gray with white, silver, green, or iridescent blue scales, with two wings, a set of antennae, slender bodies, and long legs, usually measuring about 1/4 inch to 3/8 inch in length. UMES Extension describes the species more simply, noting that Culex pipiens are small- to medium-sized mosquitoes with a light to medium brown color.
Behavior sets this species apart from the tiger mosquito almost immediately. While the Asian tiger mosquito hunts around the clock in daylight, Culex mosquitoes stick to a dawn-and-dusk schedule and are most commonly found in warm and wet environments, which are ideal for finding hosts to feed on and laying eggs. This mosquito is also the one most likely to survive Maryland’s winter as an adult. According to American Pest, male mosquitoes typically live only about a week, while females live considerably longer, often two to four weeks under normal outdoor conditions, and some species are capable of overwintering as adults, a trait that describes the Northern house mosquito common throughout Maryland, Virginia, and D.C.
You might wonder why this species, rather than the more aggressive tiger mosquito, is the one health departments watch most closely for West Nile virus. The answer comes down to diet. Research published in the Journal of Medical Entomology explains that Culex mosquitoes are the predominant vector for West Nile virus due to their preference for avian hosts. Because the virus circulates naturally among wild birds, a mosquito species that feeds mostly on birds and occasionally on people acts as an effective bridge for transmission.
Surveillance data from Anne Arundel County illustrates just how variable this risk can be year to year. A 2025 medRxiv preprint on Maryland vector surveillance found that mosquito abundance and West Nile virus-positive pools increased more than four- and five-fold, respectively, in 2024 compared to 2023, underscoring the dynamic nature of local vector populations and arboviral transmission. That kind of year-to-year swing is one reason county mosquito control programs run traps every season rather than relying on historical averages.
Important Note: This article provides general identification and prevention information and is not a substitute for medical advice. Anyone with symptoms of a mosquito-borne illness should contact a healthcare provider promptly.
Breeding sites for the common house mosquito tend to be less obvious than a tire or bucket. Storm drains, catch basins, birdbaths, and other semi-permanent sources of stagnant water all support larval development. Homeowners curious about how other backyard insects overlap with mosquito habitat can compare notes with Maryland’s beetle species, many of which share the same damp, shaded microhabitats favored by Culex larvae. For a broader look at how mosquitoes fit among the state’s other flying and crawling residents, the different types of insects found across the country follow similarly varied feeding and breeding strategies.
3. Yellow Fever Mosquito
The yellow fever mosquito (Aedes aegypti) is the least established of Maryland’s three species of concern, largely because of climate. Montgomery County’s public information office explains that climatic conditions limit the home range of Aedes aegypti to regions with more temperate winters, so in Montgomery County it is likely that Aedes albopictus is the main threat for Zika transmission. In practical terms, that means Marylanders are more likely to encounter its close relative, the Asian tiger mosquito, than the yellow fever mosquito itself in most parts of the state.
Where it does turn up, this species behaves a lot like its striped cousin. Both are daytime feeders with a strong preference for human blood over other hosts. Montgomery County notes that both are daytime feeders with a very small home range, and if they have a source of food, both nectar and blood, they will remain within a few blocks of where they hatched, which is why reducing breeding habitat in a yard is crucial to reducing exposure risk.
Disease transmission is the primary reason this mosquito draws attention despite its limited range in the state. American Pest reports that Maryland’s service area has three primary disease-concern mosquito species, the yellow fever mosquito, the Asian tiger mosquito, and the common house mosquito, which together spread West Nile virus, dengue fever, yellow fever, chikungunya, Zika virus, and several forms of encephalitis. The Frederick County Health Department reinforces this point for residents statewide, noting that mosquito bites can be itchy and annoying, but they can also spread diseases such as dengue, chikungunya, or Zika.
Pro Tip: Because Aedes aegypti and Aedes albopictus share nearly identical breeding preferences, the same container-elimination strategy that controls tiger mosquitoes also reduces yellow fever mosquito populations where they occur.
Anyone trying to distinguish this species from the more common Asian tiger mosquito in the field should look closely at the thorax pattern, since both share dark bodies with pale leg banding but differ in the shape and arrangement of their back markings. For readers who enjoy identifying Maryland’s smaller wildlife by sight, the same careful, pattern-based approach applies to Maryland’s spider species and to distinguishing look-alike caterpillars across the mid-Atlantic, a skill covered in detail in this breakdown of how many types of caterpillars exist in North America.
Reducing exposure to all three of Maryland’s mosquitoes of concern comes down to the same basic principle: eliminate the standing water they need to reproduce. The Maryland Department of Agriculture recommends eliminating mosquito breeding grounds by walking around a property and removing anything that retains water, since even a bottle cap of stagnant water can support a full generation of tiger or yellow fever mosquitoes. Larvicide products such as mosquito dunks offer an additional layer of protection for water features that cannot be drained.
- Empty and scrub birdbaths, plant saucers, and pet bowls at least once a week.
- Store unused tires, buckets, and children’s toys upside down or under cover.
- Clear gutters and downspouts of standing water and debris each season.
- Use screens on windows and doors to keep both dawn-and-dusk and daytime biters outside.
- Apply EPA-registered repellents when spending extended time outdoors during peak mosquito months.
Maryland’s mosquito population is only one part of a much larger insect community that shapes life in the state’s backyards, wetlands, and forests. Readers interested in the state’s other notable species can explore the full range of caterpillar species found across the country, or see how Maryland’s insect diversity compares with neighboring regions in this guide to insect species found in New York. Recognizing which mosquitoes bite when, and where they breed, remains the single most useful tool for keeping a Maryland yard comfortable from spring through fall.