New Brunswick · Summer breeder

Tree Swallows in New Brunswick

When tree swallows are present in New Brunswick, when they nest, which native New Brunswick plants feed them, and how to host them in a Canada 3a–5b yard.

Swallows (Hirundinidae)Tree SwallowTachycineta bicolor

Status in New Brunswick: Summer breeder
Nesting window: June
Broods: 1 per season
Hardiness zones: Canada 3a–5b
Nest box: 1 1/2 in hole, 5 × 5 in floor, 5–10 ft

When to expect tree swallows in New Brunswick

Tree Swallows are summer residents in New Brunswick, arriving shortly before nesting begins in June and leaving after the young are independent. Through the season they feed on flies, mayflies and dragonflies.

Humid continental with Bay of Fundy and Gulf of St. Lawrence coastlines and extensive forest.

Nesting in New Brunswick

Across New Brunswick, tree swallows typically nest from June. Nest site: nest box or tree cavity lined with feathers. Females lay 4–7 eggs, incubate for 11–20 days, and young leave the nest after 15–25 days.

Mild summers.

Have boxes cleaned and mounted before May — tree swallows begin prospecting ahead of egg-laying.
Use a 1 1/2 in entrance on a 5 × 5 in floor, mounted 5–10 ft.
Fit a pole baffle or hole guard; ventilation gaps and drainage holes are essential.
Clean out old nests after each brood and again after June.

Native New Brunswick plants that attract tree swallows

Of the regional native plants we track for New Brunswick, these 8 provide food or cover tree swallows use:

Serviceberry

Amelanchier arborea · Tree

Early-summer berries arrive exactly when nestlings are being fed.

Bur oak

Quercus macrocarpa · Tree

Drought-hardy prairie oak with large acorns and a heavy insect load.

Black cherry

Prunus serotina · Tree

Summer fruit and one of the top caterpillar host trees.

American elderberry

Sambucus canadensis · Shrub

Late-summer berry clusters taken by over 40 bird species.

Arrowwood viburnum

Viburnum dentatum · Shrub

Blue-black fall fruit and dense nesting cover.

New England aster

Symphyotrichum novae-angliae · Perennial

Late nectar for insects and fall seed for sparrows.

Tall goldenrod

Solidago altissima · Perennial

Insect-rich in fall and seed in winter.

Eastern white pine

Pinus strobus · Tree

Seed-rich cones and year-round shelter.

Feeding tree swallows through the New Brunswick year

Tree swallows readily take bluebird-style nest boxes; mount boxes in pairs 15–25 ft apart to share with bluebirds.

Best foods: Crushed eggshells in spring.
In New Brunswick's summer: offer water and insect foods; natural food is abundant.

Full diet breakdown for tree swallows · Best feeder for tree swallows

Frequently asked

Are tree swallows in New Brunswick year-round?

No. Tree Swallows are summer breeders in New Brunswick and leave for the winter.

When do tree swallows nest in New Brunswick?

Nesting in New Brunswick typically runs June, with 1 per season. Clutches are 4–7 eggs, incubated for 11–20 days.

What native plants attract tree swallows in New Brunswick?

Serviceberry, Bur oak, Black cherry, American elderberry, Arrowwood viburnum, New England aster, Tall goldenrod, Eastern white pine are native plants in New Brunswick that provide food or cover for tree swallows.

What size birdhouse hole do tree swallows need?

1 1/2 in, with a floor of 5 × 5 in mounted 5–10 ft.

Sources

Timing reflects typical patterns for the region as a whole; local dates vary with elevation and year. Check the linked eBird bar charts for your county.