Are pavement ants common in New Hampshire?

Yes — pavement ants (Tetramorium immigrans) are the dominant outdoor urban ant in southern and central New Hampshire. They are a year-round presence in Manchester, Nashua, Derry, Bedford, and the broader Anchor service area, nesting under sidewalks, driveways, and foundation slabs. The species is highly adapted to suburban and urban environments. For regional context, see the full ant guide.

What is making the soil piles in my sidewalk cracks?

The small crater mounds of loose soil along sidewalk joints, driveway seams, and the foundation edge are the signature sign of pavement ants. Workers excavate soil as they tunnel and ventilate their underground colony, pushing the material up through cracks. The mounds are often most visible in spring and early summer when colony activity peaks. For control options, see the full ant guide.

Pavement ant vs. odorous house ant — how do I tell them apart?

The crater mound in a sidewalk crack is the clearest pavement ant sign — odorous house ants do not build outdoor soil mounds. Under magnification, pavement ants have fine grooves on the head; odorous house ants do not. Crush an ant: odorous house ants smell like rotten coconut; pavement ants have no distinctive odor. Both are dark and small, but their nesting habits differ clearly. See the ant guide for a full comparison.

Do pavement ants come inside homes?

Yes — pavement ants regularly forage indoors through gaps at the foundation slab edge, expansion joints, and weep holes, particularly in kitchens and along baseboards. In winter, colonies near heat sources under slabs may become more active indoors. Perimeter barrier treatments and bait at entry points are more effective than interior-only spraying. For treatment guidance, see the full NH ant guide.

Pavement ant · Tetramorium immigrans

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Pavement Ant — Quick ID for New Hampshire Homeowners

Pavement ants are New Hampshire's dominant urban outdoor ant — small, dark, and identified by the tiny crater mounds of excavated soil they push up through sidewalk joints, driveway cracks, and foundation edges. They regularly invade homes from the perimeter. This is the fast identifier; for perimeter control and indoor treatment, see the full ant guide.

At a glance

Size: 2.5–4 mm; Tetramorium immigrans (formerly T. caespitum)
Signature sign: Crater mounds in pavement cracks; along sidewalks, driveways, foundation edges
Head texture: Fine parallel grooves (striations); visible under magnification
NH status: Dominant urban ant in southern NH; very common; year-round indoors near heat

The short of it

Is it a pavement ant?

Pavement ants are the small dark ants pushing up little soil mounds along your sidewalk seams, driveway joints, and foundation edge. They are New Hampshire's dominant urban outdoor ant — a year-round presence in the Anchor service area — and they regularly enter homes through foundation gaps and slab edges, especially in kitchens and basements.

This page is a fast identifier. For the full picture — perimeter control, why slab-nesting colonies resist DIY, and how pavement ants compare to odorous house ants — read the complete guide in the Ant FAQ hub linked above.

Identify it

Quick pavement ant ID

The outdoor mound and the fine head grooves visible under a hand lens are the two clearest tells.

Species profile

Pavement ant

Scientific name: Tetramorium immigrans (formerly T. caespitum)
Family: Formicidae
Size: 2.5–4 mm
Coloration: Dark brown to black
Habitat: Under pavement, sidewalk slabs, driveway joints, foundation edges; indoors in voids near baseboard heat in winter
Active season: Year-round (indoors near warmth in winter); peak outdoor activity spring through fall
Diet: True omnivore — trails to grease, meats, sweets, crumbs; anything near the foundation
Reproduction: Mating flights (swarms) in spring and summer; winged alates emerge from cracks
Lifespan: Workers live months to a year; queens several years

Dominant outdoor urban ant throughout southern and central New Hampshire; very common along foundation edges, sidewalks, and driveways in Anchor's service area.

The tells — key ID features

Tiny crater mounds of excavated soil along sidewalk joints, driveway cracks, or the foundation edge — the signature and most reliable outdoor sign.
Fine parallel grooves (striations) on the head and thorax — visible under a hand lens.
Two-segment waist with small spines (propodeal spines) on the rear of the thorax.
True omnivore: trails to grease, meat, sweets, and crumbs — found at diverse food sources.

Is it actually this? — the confusion species

Odorous house ant

How to tell — Odorous house ants lack visible waist nodes, emit a rotten-coconut odor when crushed, and do not build soil crater mounds — they nest in wall voids and indoor spaces.

Acrobat ant

How to tell — Acrobat ants are bicolored (lighter head, darker gaster) and raise their abdomen when alarmed; they nest in damp wood rather than under pavement.

What you'll notice

Signs of a problem

Look at the pavement and foundation edge.

Small piles of excavated soil forming crater mounds in sidewalk joints, driveway cracks, or along the foundation edge

What it means — Pavement ant colony nesting below — workers ventilate the nest and excavate material upward.

Trails of small dark ants entering at a slab edge, expansion joint, or toe-kick in the kitchen

What it means — Pavement ants foraging into the home from an outdoor colony at the foundation.

When it's past DIY

Pavement ant control in New Hampshire

Pavement ant colonies nest below slabs and foundation edges — areas inaccessible to most DIY products. Perimeter treatment combined with slow-acting bait is the professional approach. The full ant guide covers treatment options and what makes perimeter control effective in NH's climate.

Signals it's past DIY

When to call a pro

Recurring indoor trails from the foundation or kitchen slab edge.
Mounds along walkways or entry areas that DIY treatment hasn't resolved.
Slab or foundation nests that surface treatments can't reach.

Not sure it's a pavement ant?

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]
Penn State Extension — Pavement Ants
species biology, mound sign, urban prevalence
extensionverified 2026-06-30
[2]
Anchor Pest — Ant FAQ Guide
full NH pavement ant control and perimeter treatment
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 pavement ants in your home?

Anchor Pest Services identifies and handles pavement ant 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

Pavement Ant — Quick ID for New Hampshire Homeowners

Is it a pavement ant?

Quick pavement ant ID

The tells — key ID features

Odorous house ant

Acrobat ant

Signs of a problem

Small piles of excavated soil forming crater mounds in sidewalk joints, driveway cracks, or along the foundation edge

Trails of small dark ants entering at a slab edge, expansion joint, or toe-kick in the kitchen

Pavement ant control in New Hampshire

Not sure it's a pavement ant?

Frequently asked questions

Dealing with pavement ants in your home?

Your next step

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What Attracts Pavement Ants to Your House?

Do pavement ants damage driveways or patios?

Odorous House Ant — Quick ID for New Hampshire

Carpenter Ant — Quick ID for New Hampshire Homeowners