Are mud daubers dangerous — do they sting?

Mud daubers are solitary and nearly non-aggressive. Females can sting if directly grabbed, but they have no colony to defend and do not patrol or swarm. Most homeowners can walk past a mud nest with no risk. They are far calmer than yellowjackets or paper wasps. For a complete look at sting risk and nest handling, see the full mud dauber guide.

Are mud daubers found in New Hampshire?

Yes. Both the black-and-yellow mud dauber (Sceliphron caementarium) and the metallic blue mud dauber (Chalybion californicum) are common in New Hampshire through summer. They prefer sheltered structures — eaves, sheds, and garages — as nest sites. For seasonal timing and regional details, see the full NH guide.

What is the mud tube on my garage wall?

Finger-length parallel mud tubes on a sheltered wall are a classic mud dauber nest. Each tube is provisioned with paralyzed spiders as food for one larva, then sealed. The nest is passive and unguarded. Old nests may be reused by other insects. For removal guidance and lookalike comparisons, see the full mud dauber guide.

Mud dauber vs. paper wasp — how do I tell them apart?

The easiest tell is the nest: mud daubers build hardened mud tubes or lumps; paper wasps build an open, downward-facing paper comb on a single stalk. Body-wise, mud daubers have an extremely thread-thin elongated waist; paper wasps have a narrow but shorter waist and dangle long legs in flight. For a side-by-side comparison, see the full wasp guide.

Mud dauber · Sceliphron caementarium

Stinging InsectsNH resident

Mud Dauber — Quick ID for New Hampshire Homeowners

Also called Dirt dauber · Mud wasp

Mud daubers are solitary wasps known for their thread-thin waist and mud nests — pipe-organ tubes or a smooth daub on a sheltered wall or eave. They are non-aggressive and rarely sting. This is the fast identifier; for nest cleanup and lookalike comparisons, see the full guide.

At a glance

Size: 20–30 mm; adult body length; among the longer NH wasps
Waist: Thread-thin; the single best visual tell
Nest: Mud tubes or daub; not paper; passive, not guarded
Sting risk: Very low; solitary; stings only if directly handled

The short of it

Is it a mud dauber?

Mud daubers are identified by their thread-thin waist and distinctive hardened mud nests on sheltered walls, eaves, and garage ceilings across New Hampshire. They are solitary, non-aggressive wasps — one of the most distinctive-looking insects you'll find on your home.

This page is a fast identifier. For nest cleanup, seasonal timing, and lookalike comparisons, see the complete mud dauber guide in the Wasp Species hub linked above.

Identify it

Quick mud dauber ID

A few features make mud daubers immediately recognizable from other NH wasps.

Species profile

Mud dauber

Scientific name: Sceliphron caementarium (black-and-yellow mud dauber); Chalybion californicum (blue mud dauber)
Family: Sphecidae
Size: 20–30 mm
Coloration: Black with yellow markings (S. caementarium) or iridescent metallic blue (C. californicum)
Habitat: Sheltered vertical surfaces — eaves, shed ceilings, garage walls, barn timbers, porch overhangs
Active season: Late spring through early fall
Diet: Provisions nests with paralyzed spiders for larvae; adults feed on nectar
Lifespan: Single season; no overwintering colony

Found throughout New Hampshire in summer; nests in sheltered structures statewide.

The tells — key ID features

Thread-thin, elongated waist (petiole) — the single most distinctive feature of any NH wasp.
Black-and-yellow or iridescent metallic blue body; no bright banding pattern.
Solitary, calm, non-defensive flight near a wall — not clustered or territorial.
Builds hardened mud — pipe-organ tubes or a smooth lump — never paper.

Is it actually this? — the confusion species

Paper wasp

How to tell — Paper wasps have a narrower waist but build open paper combs and dangle their legs in flight; mud daubers build mud tubes and are far more slender overall.

Cicada killer wasp

How to tell — Cicada killers are much larger (30–40 mm), nest in ground burrows, and have amber wings — not mud-nest builders.

What you'll notice

Signs of a problem

The mud nest is the giveaway.

Finger-length mud tubes or a smooth mud lump on a sheltered wall or eave

What it means — Active or old mud dauber nest — females provision each tube with spiders for larvae.

A lone slim wasp repeatedly landing at a mud puddle or wet wall

What it means — Female gathering mud or water to provision nests.

When it's past DIY

Mud dauber removal in New Hampshire

Mud daubers are non-aggressive and beneficial (they reduce spider populations). Nest removal is cosmetic unless nests are numerous or staining a surface. The full guide covers identification and when removal makes sense.

Signals it's past DIY

When to call a pro

Nests are numerous or staining siding, trim, or masonry.
Old mud nests are attracting other insects (they may be reused by other species).
You want confirmation the ID is not a more aggressive species.

Not sure it's a mud dauber?

A licensed NH technician can confirm the species and tell you honestly whether it's a DIY fix or a job for a pro — free inspection, same-day service across Southern New Hampshire.

Get a Free Inspection (603) 785-0118

Common Questions

Frequently asked questions

Sources(2)

[1]
University of Florida IFAS Extension — Mud Daubers
biology, behavior, sting risk
extensionverified 2026-06-30
[2]
Anchor Pest — Mud Dauber Wasp Guide
full NH identification, nest removal, lookalikes
industryverified 2026-06-30

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.

Verify license

Last updated 2026-06-30

New Hampshire pest control

Dealing with mud daubers in your home?

Anchor Pest Services identifies and handles mud dauber problems across southern and central New Hampshire. Family-owned since 2017, NH license #782664.

Get a Free Inspection (603) 785-0118

NH-licensed applicators (#782664)
Same-day service · free inspection
Family-owned since 2017

Keep Exploring

Mud Dauber — Quick ID for New Hampshire Homeowners

Is it a mud dauber?

Quick mud dauber ID

The tells — key ID features

Paper wasp

Cicada killer wasp

Signs of a problem

Finger-length mud tubes or a smooth mud lump on a sheltered wall or eave

A lone slim wasp repeatedly landing at a mud puddle or wet wall

Mud dauber removal in New Hampshire

Not sure it's a mud dauber?

Frequently asked questions

Dealing with mud daubers in your home?

Your next step

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