Are There Fire Ants in Maryland?
No, fire ants are not established in Maryland. These venomous insects live in the warm southern United States, primarily in Florida, Georgia, South Carolina, and the Gulf states. Maryland's cold winters and mild summers do not support permanent fire ant colonies.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Red Imported Fire Ant · Sam Kieschnick CC BY
Red Imported Fire Ant · Emmett Collins-Sussman CC BY
Red Imported Fire Ant · Meghan Cassidy CC BY-SA
- 1
- species recorded
- 6
- GBIF records
- May, March, April
- peak months
Fire Ants are rare in Maryland, so you might also want:
Real sighting data, source iNaturalist
Only 9 verified observations on iNaturalist of fire ant have been logged in Maryland, which fits how rare they are in the state. That low number is itself the most honest answer to whether you are likely to see one here.
No, fire ants are not established in Maryland. These venomous insects live in the warm southern United States, primarily in Florida, Georgia, South Carolina, and the Gulf states. Maryland's cold winters and mild summers do not support permanent fire ant colonies.
Are They in Maryland?
Fire ants do not have established populations in Maryland. While Maryland summers are warm, the winter temperatures are consistently cold enough to prevent fire ants from surviving outdoors year-round. Fire ants are currently established only in the southeastern United States, with the core populations in Florida, Georgia, and South Carolina, and spreading westward to Louisiana and Texas. The northernmost boundary of their range remains in the Carolinas, roughly 200 to 400 miles south of Maryland. Some occasional fire ants may arrive in Maryland through shipments of soil or plants, but they cannot survive the winter to establish colonies. Maryland's native ant fauna includes several dozen species perfectly adapted to the state's climate. For details about fire ants and their actual range, seefire ants in their true habitat. Maryland residents can enjoy outdoor activities without concern for this southern threat.
How Dangerous Are They?
Fire ants are significantly more aggressive than native ant species and deliver painful stings out of proportion to their small size. A fire ant sting produces an immediate burning sensation, followed by small pustules that itch intensely for days. Most people experience mild to moderate discomfort from a single sting. Multiple stings, however, can trigger more serious reactions including significant swelling, nausea, and in rare cases, anaphylaxis. People with severe insect allergies are at highest risk for serious reactions. Deaths from fire ant stings are very rare in the United States, even among people with allergies, particularly with prompt medical treatment. The primary danger comes from the ants' behavior of attacking in large swarms when a nest is disturbed, resulting in dozens or hundreds of stings at once. Since fire ants are absent from Maryland, residents face no risk from this species. Understanding their danger helps travelers venturing to southern states prepare appropriately. For more on fire ant in Maryland, see ourMaryland fire ant guide.
How to Recognize One
Fire ants are small reddish-brown ants measuring one-eighth to one-quarter inch in length. Their bodies are darker at the rear than at the front, giving them a distinctive two-tone appearance. Unlike many other ant species, fire ants produce no pungent smell when crushed. The most recognizable sign of fire ants is their nest structure: large earthen mounds in open soil, often several feet in diameter, typically found in fields, pastures, roadsides, and disturbed areas. These mounds are easy to spot but extremely dangerous to approach, as hundreds or thousands of ants will swarm if the nest is disturbed. Maryland's environment does not contain these distinctive mounds. Maryland native ants are typically smaller, form different nesting structures, and are far less aggressive. Several of Maryland's native ant species are reddish-brown but lack the aggressive behavior and swarm response of fire ants. For more information, explorewildlife in Marylandto learn about the ants you may actually encounter.
What to Do If You Are Bitten or Stung
If you are stung, move immediately away from the ants and brush them off your skin. Wash the area with soap and water to prevent infection. Remove any jewelry or tight clothing that might restrict swelling. Apply a cold compress to reduce pain and swelling. Do not scratch the developing pustules, which appear within an hour and can itch for several days. Resisting the urge to scratch prevents secondary infection. Antihistamines or topical hydrocortisone cream can reduce itching. Most fire ant stings heal without medical intervention within a few days to a week. If you develop severe swelling of the face or throat, difficulty breathing, dizziness, or signs of allergic reaction, seek emergency medical care immediately. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Maryland residents do not need to worry about fire ants, but this information is useful for travel to southern states. You can also browseMaryland wildlife.
How to Prevent Encounters
In Maryland, preventing fire ant encounters is not necessary because fire ants do not inhabit the state. However, travelers heading south should know basic prevention. Wear closed-toe shoes and long pants when in areas where fire ants might be present. Avoid stepping on or disturbing any suspicious soil mounds in southern states. When camping or hiking in the southern United States, inspect shoes and boots before putting them on, as fire ants sometimes crawl into footwear. Shake out clothes, sleeping bags, and other gear before using them. Be cautious when sitting on the ground or leaning against logs and trees, as fire ants may be nearby. Keep food sealed and avoid leaving trash in areas where these ants forage. When visiting southern states with friends or family, ask locals about fire ant presence in specific recreational areas. Maryland's northern climate means you can practice outdoor safety without concern for this particular species.
Where in Maryland and When
Fire ants are completely absent from Maryland. There are no regions within Maryland where these insects occur, and there are no seasons when they are active in the state. The fire ant range is confined to warm regions of the southern United States, with the northern edge currently in North Carolina and South Carolina, several hundred miles south of Maryland. The insects require sustained warm temperatures to reproduce and cannot survive freezing winters. Maryland's average winter temperatures drop well below the freezing point, killing any fire ants that might accidentally arrive. Even if dormant fire ants were transported to Maryland in soil or plants, they could not activate and reproduce in the cold season. The warmest parts of Maryland do not provide enough consistent heat for year-round fire ant survival. For details aboutwildlife in Maryland and what you can expect year-round, local resources provide seasonal guides to actual regional species.
Harmless Lookalikes
If you encounter ants in Maryland that raise concern, they are almost certainly harmless native species. Carpenter ants are common in Maryland and are large (one-quarter to one-half inch), dark-colored, and sometimes reddish, but they do not deliver stings and are not venomous. They can damage wood but pose no immediate health risk. Pavement ants are small, dark brown, and frequently seen marching in single-file trails on sidewalks and patios. Field ants are reddish-brown and similar in appearance to fire ants, but they do not swarm aggressively and do not deliver painful stings. Acrobat ants are small, light tan to dark brown, and sometimes nest in wood or foam insulation. All of Maryland's native ants are far less aggressive than fire ants. If you are uncertain about an ant species in or around your home, contact a local pest management professional or your county extension office for accurate identification. Maryland's native ants are generally beneficial and should be left alone.
Frequently Asked Questions
**Are fire ants deadly?** Fire ant stings are rarely fatal in healthy people, even when there are multiple stings. Deaths are extremely rare and typically occur only in people with severe allergies who do not receive medical care promptly. **How common are fire ant stings in Maryland?** Fire ant stings do not occur in Maryland because the insects do not live in the state. **What attracts fire ants to a house?** In southern states where they are established, fire ants are drawn to moisture, food, and shelter. They may build nests near homes seeking water sources. **What should I do if I see one?** If you live in a southern state and believe you have fire ants, contact a local pest control company or your state's agricultural extension service. Maryland residents can explorewildlife safety information for Marylandto learn about the actual wildlife risks in our state and how to safely coexist with native species.
Plan your trip
Best time to see fire ant in Maryland: May, March, April
See the month-by-month sighting calendar.
Plan your fire ant sighting in Maryland
6 verified fire ant records have been logged in Maryland, most recently in 2026. See the GBIF records.
Where to look in Maryland
- Antietam National Battlefield · Wildlife Watching, Birdwatching · Find hotels
- Appalachian National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Assateague Island National Seashore · Wildlife Watching, Birdwatching · Find hotels
- Captain John Smith Chesapeake National Historic Trail · Wildlife Watching, Birdwatching · Find hotels
- Chesapeake & Ohio Canal National Historical Park · Wildlife Watching, Birdwatching · Find hotels
- Chesapeake Bay · Wildlife Watching · Find hotels
Frequently asked questions
Are They in Maryland?+
Fire ants do not have established populations in Maryland. While Maryland summers are warm, the winter temperatures are consistently cold enough to prevent fire ants from surviving outdoors year-round. Fire ants are currently established only in the southeastern United States, with the core populations in Florida, Georgia, and South Carolina, and spreading westward to Louisiana and Texas. The northernmost boundary of their range remains in the Carolinas, roughly 200 to 400 miles south of Maryland. Some occasional fire ants may arrive in Maryland through shipments of soil or plants, but they cannot survive the winter to establish colonies. Maryland's native ant fauna includes several dozen species perfectly adapted to the state's climate. For details about fire ants and their actual range, seefire ants in their true habitat. Maryland residents can enjoy outdoor activities without concern for this southern threat.
How Dangerous Are They?+
Fire ants are significantly more aggressive than native ant species and deliver painful stings out of proportion to their small size. A fire ant sting produces an immediate burning sensation, followed by small pustules that itch intensely for days. Most people experience mild to moderate discomfort from a single sting. Multiple stings, however, can trigger more serious reactions including significant swelling, nausea, and in rare cases, anaphylaxis. People with severe insect allergies are at highest risk for serious reactions. Deaths from fire ant stings are very rare in the United States, even among people with allergies, particularly with prompt medical treatment. The primary danger comes from the ants' behavior of attacking in large swarms when a nest is disturbed, resulting in dozens or hundreds of stings at once. Since fire ants are absent from Maryland, residents face no risk from this species. Understanding their danger helps travelers venturing to southern states prepare appropriately. For more on fire ant in Maryland, see ourMaryland fire ant guide.
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