When Do Mosquitoes Come Out In Maryland

Mosquitoes can be a real nuisance, but they’re also an important part of the environment. And while the Maryland Department of Health works hard to keep our state free from threats like West Nile virus and Lyme disease, you can do your part to make sure that mosquitoes don’t become a problem for you or your family. To help understand when mosquitoes come out in Maryland (and what months are most dangerous), we’ve compiled some information below:

What month do mosquitoes start coming out?

Mosquitoes become active in April and May, then again in the summer. Mosquitoes are most active from dusk to dawn. The period from April through September is their prime time for biting humans. In late summer or fall, they can be out during the day as well as night.

Mosquito bites will cause a red spot on your skin that may itch and swell within hours of being bitten by an adult mosquito. When you are bitten by a mosquito larva (baby), it will not cause an immediate reaction like adult bites do; instead, it takes up to 14 days for symptoms such as itching or swelling at the site of your bite to appear!

What months are mosquitoes most active?

Mosquitoes are the most active in the summer, spring and fall. This is because mosquitoes are cold-blooded creatures; they need heat to thrive. They become inactive when temperatures drop below 50 degrees Fahrenheit and die off completely when temperatures drop below freezing (32 degrees F).

When do mosquitoes come out?

  • Summer: June through September
  • Spring: March through May
  • Fall: October through December

Does Maryland have a lot of mosquitoes?

Does Maryland have a lot of mosquitoes? It depends on where you’re standing. There are many factors that determine how many mosquitoes live in an area, including the amount of water, humidity and marshland available.

Baltimore, for example—a port city with a humid climate—has been ranked by experts as one of the most mosquito-infested cities in America. In fact, it’s been named one of the top 25 worst places to live if you’re allergic to mosquito bites. Baltimore is home to both marshland and wetlands (which provide breeding grounds for these insects), so it’s not surprising that this area has seen an increase in recent years when it comes to mosquito populations.


We hope this post helped you better understand how mosquitoes affect Maryland’s weather and vegetation. If you have any more questions about the mosquito life cycle, give us a call!

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