Purple Martins in New Hampshire
When purple martins are present in New Hampshire, when they nest, which native New Hampshire plants feed them, and how to host them in a USDA 3b–6a yard.
- Status in New Hampshire
- Summer breeder
- Nesting window
- June–July
- Broods
- 1 per season
- Hardiness zones
- USDA 3b–6a
- Nest box
- 1 3/4–2 1/8 in round, or starling-resistant crescent (3 × 1 3/16 in) hole, 6 × 6 in minimum (6 × 12 in preferred) floor, 10–20 ft on a telescoping pole, 40+ ft from trees
When to expect purple martins in New Hampshire
Purple Martins are summer residents in New Hampshire, arriving shortly before nesting begins in June and leaving after the young are independent. Through the season they feed on dragonflies, flies, beetles and moths; flying ants and wasps.
Humid continental, with the White Mountains dividing the southern lowlands from northern forest.
Nesting in New Hampshire
Across New Hampshire, purple martins typically nest from June–July. Nest site: in the East, nests almost entirely in human-supplied martin houses and gourds. Females lay 3–6 eggs, incubate for 15–18 days, and young leave the nest after 26–32 days.
Mild summers; nesting starts late May.
- Have boxes cleaned and mounted before May — purple martins begin prospecting ahead of egg-laying.
- Use a 1 3/4–2 1/8 in round, or starling-resistant crescent (3 × 1 3/16 in) entrance on a 6 × 6 in minimum (6 × 12 in preferred) floor, mounted 10–20 ft on a telescoping pole, 40+ ft from trees.
- Fit a pole baffle or hole guard; ventilation gaps and drainage holes are essential.
- Clean out old nests after each brood and again after July.
Native New Hampshire plants that attract purple martins
Of the regional native plants we track for New Hampshire, these 8 provide food or cover purple martins use:
Early-summer berries arrive exactly when nestlings are being fed.
Acorns plus hundreds of caterpillar species for nestling food.
Summer fruit and one of the top caterpillar host trees.
Late-summer berry clusters taken by over 40 bird species.
Blue-black fall fruit and dense nesting cover.
Lipid-rich red fruit fuels fall migrants.
Late nectar for insects and fall seed for sparrows.
Insect-rich in fall and seed in winter.
Feeding purple martins through the New Hampshire year
Purple Martins do not use feeders. Supporting them means supplying correctly built colony housing in the open and managing House Sparrows and starlings.
- Best foods: Crushed eggshells (calcium) offered on a tray near housing.
- Avoid: Seed and suet feeders — martins will not use them.
- In New Hampshire's summer: offer water and insect foods; natural food is abundant.
Frequently asked
Are purple martins in New Hampshire year-round?
No. Purple Martins are summer breeders in New Hampshire and leave for the winter.
When do purple martins nest in New Hampshire?
Nesting in New Hampshire typically runs June–July, with 1 per season. Clutches are 3–6 eggs, incubated for 15–18 days.
What native plants attract purple martins in New Hampshire?
Serviceberry, White oak, Black cherry, American elderberry, Arrowwood viburnum, Spicebush, New England aster, Tall goldenrod are native plants in New Hampshire that provide food or cover for purple martins.
What size birdhouse hole do purple martins need?
1 3/4–2 1/8 in round, or starling-resistant crescent (3 × 1 3/16 in), with a floor of 6 × 6 in minimum (6 × 12 in preferred) mounted 10–20 ft on a telescoping pole, 40+ ft from trees.
Purple Martins in other regions
Other backyard birds in New Hampshire
Sources
- Purple Martin — All About Birds, Cornell Lab of Ornithology
- Purple Martin life history — Cornell Lab of Ornithology
- Purple Martin — Audubon Guide to North American Birds
- Purple Martin Conservation Association — housing guidelines
- eBird region overview and bar charts — New Hampshire
- USDA Plant Hardiness Zone Map (2023)
- Audubon Native Plants Database
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.