Yellowjackets in Maryland
Yes — yellowjackets are recorded in Maryland. The GBIF biodiversity database holds 257 verified yellowjacket records from the state — ranking it 10th nationally. Sightings concentrate in April, May, September, October. Onset: immediate sharp pain. Duration: pain hours; swelling can last several days.
| Verified records | 257 |
|---|---|
| Peak sightings | April, May, September, October |
| State bite season | April to October |
| Active | daytime, peaking in late summer when colonies are largest and food-seeking |
| Habitat | ground nests in banks and lawns, wall cavities, rubbish bins and picnic tables |
| Bite appears | immediate sharp pain |
Yellowjacket bites in Maryland: what the mark looks like
Yellowjackets are the wasps at the picnic. Unlike honey bees they leave no stinger behind and can sting several times, and the pain is immediate and intense rather than building. Late summer is when stings peak, because colonies are at their largest and switching to sugar.
Locally, the species most often confused with it are kissing bug bite — all of which are also recorded in Maryland.
Seek medical care if
Call emergency services now for difficulty breathing, swelling of the lips, tongue or throat, dizziness or fainting, or hives spreading away from the bite.
- throat tightness, breathing difficulty, dizziness, hives away from the sting — emergency
- stings inside the mouth or throat
- many stings at once
- swelling that spreads across a whole limb over 24 to 48 hours
What else it could be in Maryland
These are recorded in Maryland too and are the ones most often confused with it here. The differences below are the ones that actually separate them.
| Yellowjacket sting | Honey bee sting | Bald-faced hornet sting | Paper wasp sting | |
|---|---|---|---|---|
| Pattern | single or several — this wasp can sting repeatedly | single | often several — the colony defends aggressively | usually single |
| Where on body | hands, face, neck | feet — bees are often stepped on in clover, hands, face | head, neck, arms | hands, head, arms — often while gardening or opening a shutter |
| Appears | immediate sharp pain | immediate sharp pain | immediate severe pain | immediate sharp pain |
| Records here | 257 | 10,763 | 1,522 | 574 |
Yellowjacket season in Maryland specifically
Records in Maryland concentrate in April, May, September, October, which is what local sighting data shows rather than a national average — seasonality shifts substantially with latitude. The general bite season in Maryland runs April to October.
Because ground nests in banks and lawns, wall cavities, rubbish bins and picnic tables, exposure in Maryland tends to be concentrated in specific places rather than spread evenly — which is why a bite history ("where were you in the 24 hours before?") narrows the answer faster than the appearance of the mark.
Month by month in Maryland
These are the 257 Maryland records broken out by the month they were recorded — not a national curve redrawn for the state. Records appear in 12 of the 12 months here. The single busiest month is October with 45 records (22% of the state total).
| Month | Records | Share |
|---|---|---|
| January | 4 | 2% |
| February | 4 | 2% |
| March | 10 | 5% |
| April | 25 | 12% |
| May | 29 | 14% |
| June | 2 | <1% |
| July | 7 | 3% |
| August | 18 | 9% |
| September | 33 | 16% |
| October | 45 | 22% |
| November | 18 | 9% |
| December | 7 | 3% |
Counts are observations submitted to GBIF, not bites. They tell you when the animal is out and being noticed in Maryland; they do not tell you how many people were bitten. The thinnest month with any record at all is June (2).
How Maryland compares
Across the 41 states with any yellowjacket records, Maryland ranks 10th with 257. The state directly above it is Indiana (268). Directly below is New Jersey (249). The highest count anywhere is New York (1,726).
Inside Maryland itself the picture is different again: of the 21 biting species we track with records here, this one is 11th and accounts for 1% of the 23,160 records logged in the state. A species can be common nationally and marginal in one state, or the reverse — which is the whole reason this page exists separately from the national guide.
Care
- move away — yellowjackets release an alarm pheromone and recruit
- wash and apply a cold pack
- antihistamine and pain relief
- adrenaline auto-injector immediately if previously prescribed
Avoiding yellowjackets in Maryland
- cover food and sweet drinks outdoors — check cans before drinking
- keep bins closed and away from seating
- have ground nests treated professionally
Questions
Are there yellowjackets in Maryland?
Yes. Maryland accounts for 257 verified records in GBIF, ranking it 10th among the 41 states with any records for this species, just behind Indiana (268). Within Maryland it is 11th of the 21 biting species we track here, at 1% of the state's records. Records reflect reporting effort as well as abundance.
When are yellowjackets active in Maryland?
Maryland records peak in April, May, September, October. The general bite season in Maryland runs April to October.
What does the bite look like?
a raised red welt, often with a visible central point, and marked swelling, red with pale swollen centre. Single or several — this wasp can sting repeatedly.
Which month has the most sightings in Maryland?
October, with 45 of the 257 Maryland records (22%). Records appear in 12 of the 12 months here. This counts sightings submitted to GBIF, not bites.
Get a photo assessment in the app
Everything above is free to read. The app adds what a page cannot: point your camera at the bite and get an assessment of the most likely cause, a severity read, and a day-by-day care plan — including the specific signs that mean you should be seen.
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