Is that giant wasp in my yard a murder hornet?

Almost certainly not — and as of December 18, 2024, definitively not. USDA and Washington State Department of Agriculture declared the northern giant hornet (Vespa mandarinia) eradicated from Washington state and the entire United States after three years with no confirmed detections. Washington was the only US state where V. mandarinia was ever found, and it was never detected in New Hampshire or anywhere in New England. The large wasp hovering over a sandy lawn in NH in July or August is almost always an eastern cicada killer (Sphecius speciosus) — a solitary, harmless digger wasp that happens to be the biggest wasp NH homeowners regularly encounter. The size can be alarming — up to 50 mm — but the behavior is completely different: a cicada killer ignores people, while a murder hornet would have been a defensive social insect. The murder hornet chapter is now closed.

Can cicada killers sting?

Female cicada killers carry a stinger and technically can sting, but they almost never do. The females are focused on hunting cicadas and provisioning burrows; they have no colony to defend and no territorial aggression toward people. Oklahoma State Extension describes them as "unusually docile and harmless." Entomologists report that you generally have to grab a female and squeeze her before she will sting. The males — which are responsible for most of the hovering, buzzing, and apparent aggression homeowners observe — cannot sting at all. Male wasps across all wasp species lack a stinger; the territory-defending behavior of male cicada killers is entirely bluff. For sting first aid if a rare female sting does occur, see /yellowjackets/yellow-jacket-sting-treatment or call the Northern New England Poison Center at 1-800-222-1222.

Are cicada killers in New Hampshire?

Yes, but uncommonly. New Hampshire sits near the northern edge of the eastern cicada killer's range, and documented records here are sparse — approximately one BugGuide NH occurrence record compared with 31 for Massachusetts and 64 for New York. A homeowner in Plaistow, NH has documented cicada killers digging in sandy patio soil, confirming they do reach southern NH. The Massachusetts Cicadas project notes that cicada-killer information is "extremely lacking" for Vermont, New Hampshire, and Maine. If you are seeing a cicada killer in NH, you are encountering a relatively uncommon species near its range edge — and one that poses no meaningful risk.

Are cicada killers dangerous to children or pets?

No. Cicada killers are solitary wasps with no colony to defend, and they direct almost all of their attention toward hunting cicadas. Children running through a yard where cicada killers are nesting are not at meaningful risk; the wasps will not pursue, chase, or sting unless physically handled or trapped against skin. Pets digging at burrows could theoretically prompt a female to sting in self-defense, but even this is uncommon. The males — the large, hovering, buzzing individuals that look most alarming — cannot sting at all. Virginia Tech Extension puts it plainly: the cicada killer "is not an insect of concern to humans and pets" and is "generally a docile insect."

Should I kill cicada killers — and when is treatment ever warranted?

Rarely, and almost never for a typical lawn situation. Cicada killers are beneficial insects — they control populations of annual cicadas and contribute to late-season pollination. Because they are solitary, there is no colony to suppress, and killing individual wasps accomplishes nothing; burrows are naturally abandoned by September. Treatment is occasionally considered when large numbers of females aggregate in a confined sandy area across multiple seasons and the cumulative soil disturbance is visibly damaging turf. Even then, improving ground cover — seeding bare spots, adding mulch, watering to discourage the bare-soil patches females prefer — is more durable than insecticide, which does not stop future females from selecting the same site. If you are unsure whether you have cicada killers or a social ground-nesting wasp like a yellowjacket, Anchor Pest Services confirms the species before any action; NH license #782664, flat, one-time rate for social-wasp removal.

How big is a cicada killer wasp?

Eastern cicada killers range from 30 to 50 mm in length — roughly 1.5 to 2 inches. Females are larger than males. At 50 mm, a cicada killer is approximately twice the width of a US quarter (24.26 mm), making it visually one of the most impressive wasps a NH homeowner will ever encounter. The Connecticut Agricultural Experiment Station identifies the eastern cicada killer as New England's largest solitary wasp. The size is real and genuinely startling at first encounter, which is precisely why it triggers murder-hornet worry — but size alone says nothing about danger. Cicada killers are among the most docile of all large wasps.

How do I tell a cicada killer from a European hornet?

Several field marks separate them reliably. The cicada killer has a distinctly teardrop-shaped abdomen tapering to a point, a rusty-red head and thorax, and digs solitary ground burrows with mounds of loose soil. The European hornet (Vespa crabro) — New Hampshire's only true hornet — is 25–35 mm, has a cylindrical abdomen with teardrop-shaped black marks on a yellow background, and is brown-and-yellow rather than rusty-red. The most distinctive behavioral tell: European hornets are frequently attracted to lights and fly actively at night; cicada killers are strictly daytime fliers. European hornets also build social paper nests inside cavities (tree hollows, wall voids, attics) — never the single ground burrow with a soil mound that identifies a cicada killer.

Why are there big wasps digging holes in my lawn?

Female cicada killers excavate individual burrows in bare, sandy, or well-drained soil — each female digs her own burrow, 10 to 20 inches deep, and provisions it with paralyzed cicadas as food for her larvae. Each burrow is a single-female project; there is no shared colony. The distinctive sign is a pile or fan of loose, freshly excavated soil at the burrow entrance, often with a single large wasp disappearing into it. If you see one burrow with a steady stream of many wasps flying in and out aggressively, that is not a cicada killer — that is a yellowjacket ground nest, which is a very different situation requiring professional assessment. One burrow, one wasp, docile behavior = cicada killer.

When are cicada killers active in New Hampshire?

Adult cicada killers emerge in late June or early July, timed to the emergence of annual (dog-day) cicadas, which are their prey. Activity peaks in July and August. By September, the adults are gone — they die off as the season ends, leaving provisioned burrows behind. The burrows are not reused the following year; new females dig fresh ones. In New Hampshire's climate, this means the July–August window is the entire period of visible activity. Homeowners who find mounds of excavated soil and hovering large wasps in early July and are panicking by mid-July can expect the situation to resolve naturally by September, with no treatment needed in most cases.

Do cicada killers damage my lawn?

Individual cicada killer burrows cause minor soil disturbance — the mound of excavated soil at the entrance is the main visible effect. In most yards with one or a small number of burrows, this is cosmetic and temporary; the burrows are abandoned by fall and the disturbed soil settles. In rare cases where dozens of females aggregate in the same sandy area over several seasons, the cumulative soil disturbance can affect turf. In those high-density scenarios, improving the ground cover — seeding thin or bare spots, adding a layer of mulch, or watering to discourage bare-soil patches — is more effective long-term than insecticide, since killing current residents does not prevent future females from finding the same site.

Daniel Brady · NH-Licensed Pesticide Applicator · License #782664

|Reviewed by Daniel Brady

Cicada Killer Wasp in NH — Giant but Harmless

Identification

The eastern cicada killer (Sphecius speciosus) is the largest solitary wasp you will encounter in New Hampshire — up to 2 inches long — but it is effectively harmless: females rarely sting and only if grabbed, while males have no stinger at all. It is a solitary ground-nesting wasp active in July and August, and it is not a murder hornet — Vespa mandarinia was declared eradicated from the entire United States on December 18, 2024, and was never found in New Hampshire or anywhere in New England.

Quick facts

Size: 30–50 mm (up to 2 in)New England's largest solitary wasp; CT Agricultural Experiment Station / Wikipedia
Sting: Female rarely stings; males have no stingerOK State Extension; males display aggressively but are physically incapable of stinging
Sociality: Solitary — single burrow per female, no colony to defendIllinois DNR
Active season: Late June / July through SeptemberTimed to dog-day cicada emergence; Illinois DNR

Size
30–50 mm (up to 2 in)
New England's largest solitary wasp; CT Agricultural Experiment Station / Wikipedia
Sting
Female rarely stings; males have no stinger
OK State Extension; males display aggressively but are physically incapable of stinging
Sociality
Solitary — single burrow per female, no colony to defend
Illinois DNR
Active season
Late June / July through September
Timed to dog-day cicada emergence; Illinois DNR

Overview

New Hampshire's biggest wasp — and why it is nothing to fear

In July and August, NH homeowners sometimes spot an enormous wasp — rusty-red head, black-and-yellow-banded abdomen, amber wings — hovering low over a lawn or patio, or hovering over a single hole in bare or sandy soil. The size alone is alarming: at up to 50 mm, the eastern cicada killer (Sphecius speciosus) is genuinely one of the largest wasps in the eastern United States. And since the "murder hornet" story dominated headlines before USDA and Washington State declared Vespa mandarinia eradicated from the United States on December 18, 2024, that alarming size has made the cicada killer the #1 "is that a murder hornet?" panic species in NH lawns.

It is not a murder hornet. It was never close to one. The cicada killer is a solitary digger wasp — not social, not colonial, and not defensive — with the personality of a gentle giant. The males you see patrolling and hovering look aggressive, but they cannot sting: male wasps across all species lack a stinger. The females carry a stinger but rarely use it; entomologists who have handled hundreds of cicada killers describe them as able to sting only if you squeeze one in your hand. Oklahoma State Extension calls them "unusually docile and harmless" and Justin Schmidt himself — creator of the sting pain index — called cicada killers "gentle giants of the wasp world."

Cicada killers are genuinely uncommon in New Hampshire. The state sits near the northern edge of the species' range, and documented NH records are sparse — roughly one record in BugGuide's contributed-data table versus 31 for Massachusetts and 64 for New York. A homeowner report from Plaistow, NH confirms they do occur here. If you are seeing this wasp in your yard, you are among a relatively small group of NH residents who encounter it, and the honest answer to "should I do anything about it?" is almost always no.

This page covers how to identify the eastern cicada killer, how to tell it from the European hornet and the now-eradicated murder hornet, what the soil mounds in your lawn actually are, and the narrow circumstances in which professional assessment is warranted.

New Hampshire context

Cicada killers in New Hampshire — uncommon but documented

New Hampshire sits near the northern edge of the eastern cicada killer's range. The Massachusetts Cicadas project states plainly that cicada-killer records are "extremely lacking especially in Vermont, New Hampshire and Maine," and BugGuide's contributed-occurrence data shows approximately one NH record compared with 31 for Massachusetts and 64 for New York. A documented homeowner report from Plaistow, NH confirms that cicada killers do reach the state — specifically in bare sandy soil between patio pavers — but they are genuinely uncommon here compared with southern New England. Where cicada killers do appear in NH, they favor bare, well-drained, and sandy soils in sunny areas: garden edges, lawn patches with thin or worn grass, sandy utility strips, and disturbed ground near driveways or paths. They are active in the July–August window timed to the emergence of annual (dog-day) cicadas, which are their prey. By September, adults are gone. The solitary nature of cicada killers means there is no colony, no defended nest territory, and essentially no sting risk to people or pets going about normal yard activity. Treatment is warranted only in rare cases where dozens of females are sharing the same sandy area and the physical soil disturbance is damaging turf.

Peak activity · July through August

We serve these communities

PlaistowSalemDerryHudsonNashuaManchester

UNH Cooperative Extension notes cicada killers and other solitary digger wasps as part of New Hampshire's solitary wasp fauna; solitary ground-nesting wasps are docile and rarely require treatment — Resource000532.

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Field identification

How to identify the eastern cicada killer — and what it is not

The eastern cicada killer is large enough that it can be identified on size and color alone from a few feet away. Three field marks separate it instantly from European hornets and from the now-eradicated murder hornet.

Eastern cicada killer

Also called: Cicada hawk, Sand hornet (misnomer)

Rare in New HampshireSolitaryLow aggression

Scientific name: Sphecius speciosus
Family: Bembicidae (formerly Crabronidae / Sphecidae)
Sociality: Solitary
Size: 30–50 mm (1.5–2.0 in); females are larger than males
Coloration: Rusty-red head and thorax; black abdomen with three pairs of pale yellow bands; brown or amber wings; orange legs. The combination of rusty-red and yellow on a wasp of this size is unlike any common social wasp in New Hampshire.
Range: Present but uncommon in New Hampshire, near the northern edge of the species' range. Approximately one BugGuide NH contributed-occurrence record versus 31 for Massachusetts; documented Plaistow, NH homeowner report. Massachusetts Cicadas notes NH data is 'extremely lacking.'
Nest style: Single ground burrow 10–20 inches deep, excavated by the female alone using her jaws and hind legs, with a fan of loose soil at the entrance. One burrow per female. No shared colony.
Sting: Female rarely stings — only if directly grabbed or trapped; males have NO stinger. Oklahoma State Extension: 'this wasp is unusually docile and harmless.'
Beneficial role: Natural control of annual (dog-day) cicada populations; secondary late-summer pollinator

Scale

~2× the width of a US quarter (24.26 mm)

The size that triggers murder-hornet alarm — but behavior is completely different

Males sting?

No — males are physically incapable of stinging

Male wasps across all species lack a stinger; hovering territory display is bluff

Murder hornet?

No — Vespa mandarinia eradicated from US Dec 18, 2024; never in NH

WSDA / USDA news release

Active window

Late June / July–September

Timed to annual cicada emergence; gone by early fall

Head and thorax

Distinctly rusty-red or reddish-orange — a warm, brick-red color unlike the brown-and-yellow of a European hornet or the all-yellow/orange head of the Vespa mandarinia. The rusty-red thorax is one of the fastest single ID cues.

Abdomen

Black with three pairs of pale yellow bands, tapering to a point — a teardrop or spindle shape. Contrast with the European hornet's more cylindrical abdomen and teardrop-shaped black marks on yellow. The yellow bands on the cicada killer are on a primarily black background; on the European hornet, black marks are on a primarily yellow background.

Wings

Brown or amber-tinted, translucent. Held flat at rest. No metallic sheen. Span roughly equal to body length.

Legs

Orange. The orange leg color combined with the rusty-red thorax makes the cicada killer warm-toned overall — very different from the cooler yellow-and-brown European hornet.

Size

30–50 mm — up to 2 inches. Females are at the larger end of this range. At 50 mm, the cicada killer is approximately twice as wide as a US quarter (24.26 mm) and noticeably larger than any social wasp in New Hampshire except a large European hornet queen.

Common look-alikes

European hornet (Vespa crabro) — NH's only true hornet
How to tell: Size overlap (25–35 mm) is the main confusion source. Key tells: European hornet is brown-and-yellow rather than rusty-red-and-yellow; its abdomen is more cylindrical with teardrop-shaped black marks on a yellow ground (cicada killer has yellow bands on a black ground); it flies actively at night attracted to lights (cicada killers are daytime-only); and it builds a social paper nest inside a cavity (tree hollow, wall void, attic), never a solitary ground burrow with a soil mound. If a large wasp is bumping against your porch light at 11 p.m., it is almost certainly a European hornet, not a cicada killer.
Northern giant hornet / 'murder hornet' (Vespa mandarinia) — eradicated from the US Dec 18, 2024
How to tell: Vespa mandarinia was declared eradicated from Washington state and the entire United States on December 18, 2024 by WSDA and USDA, after three years with no confirmed detections. It was never found in New Hampshire or anywhere in New England — Washington was the only US state where it ever occurred. For the record: the murder hornet had a very large solid orange head (unlike the cicada killer's rusty-red head blending into a banded abdomen), no teardrop abdominal markings, and was a highly social species that defended a colony. The giant docile solitary wasp digging in your NH lawn in July is a cicada killer. The murder hornet chapter is closed.
Great black wasp (Sphex pensylvanicus)
How to tell: The great black wasp is all matte-black with smoky blue-iridescent wings — no rusty-red, no yellow banding. It is also a solitary ground digger, also harmless, and also active in summer. Cicada killers are unmistakably larger and distinctively patterned with rusty-red and yellow. Both are equally docile.

Common Questions

Frequently asked

References

Sources & further reading (13)

[1]
Oklahoma State Extension — Cicada Killer (Sphecius speciosus)
extension · Cicada killer 'unusually docile and harmless'; males aggressive but cannot sting; females rarely sting · verified Jun 2026
[2]
CT Agricultural Experiment Station — Cicada Killers
gov · Eastern cicada killer identified as New England's largest solitary wasp · verified Jun 2026
[3]
Illinois DNR — Cicada Killer
gov · Burrow depth 10–20 inches; dug with jaws and hind legs; adult activity window late June–September · verified Jun 2026
[4]
Virginia Tech Extension (VCE) — Cicada Killers in Managed Turf
extension · Cicada killer 'not an insect of concern to humans and pets'; generally docile; turf management context · verified Jun 2026
[5]
Wikipedia — Sphecius speciosus (Eastern Cicada Killer)
encyclopedia · Size 30–50 mm (1.5–2 in); coloration (rusty-red head/thorax, yellow-banded black abdomen, amber wings); family Bembicidae; species biology · verified Jun 2026
[6]
Massachusetts Cicadas — Cicada Killers of New England
forum · NH records 'extremely lacking'; Plaistow, NH homeowner report; data-gap context for New England cicada-killer records · verified Jun 2026
[7]
BugGuide — Sphecius speciosus range data
encyclopedia · ~1 New Hampshire contributed-occurrence record vs 31 Massachusetts and 64 New York; confirms NH near range edge · verified Jun 2026
[8]
WSDA / USDA — Northern Giant Hornet Eradicated (Dec 18, 2024)
gov · Vespa mandarinia declared eradicated from Washington and the entire US on December 18, 2024; never found in NH or New England · verified Jun 2026
[9]
Wikipedia — Vespa crabro (European Hornet)
encyclopedia · European hornet size 25–35 mm; cylindrical abdomen with teardrop black marks; attracted to lights at night; cavity paper nest · verified Jun 2026
[10]
UNH Cooperative Extension — Controlling Wasps, Bees and Hornets Around Your Home
extension · NH solitary wasp fauna; solitary wasps rarely require treatment; after-dark treatment guidance for social wasps · verified Jun 2026
[11]
UF/IFAS — Cicada Killer (EENY295)
extension · Cicada killer biology; prey provisioning; range and habitat · verified Jun 2026
[12]
US Mint — Quarter (United States) Coin Specifications
gov · US quarter diameter 24.26 mm — true-to-scale size reference (cicada killer ~2× a quarter wide) · verified Jun 2026
[13]
Northern New England Poison Center
medical · 24/7 poison control for NH/ME/VT; 1-800-222-1222 · verified Jun 2026

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

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Last updated Jun 2026

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