House Wrens in Iowa
When house wrens are present in Iowa, when they nest, which native Iowa plants feed them, and how to host them in a USDA 4b–6a yard.
- Status in Iowa
- Summer breeder
- Nesting window
- May–August
- Broods
- 2 per season
- Hardiness zones
- USDA 4b–6a
- Nest box
- 1 to 1 1/8 in round hole, 4 × 4 in floor, 5–10 ft near shrubs
When to expect house wrens in Iowa
House Wrens are summer residents in Iowa, arriving shortly before nesting begins in May and leaving after the young are independent. Through the season they feed on beetles, caterpillars and crickets; spiders and flies.
Humid continental prairie state, with loess hills in the west and the Driftless Area in the northeast.
Nesting in Iowa
Across Iowa, house wrens typically nest from May–August. Nest site: almost any cavity — boxes, gourds, even boots and flowerpots; males build several stick-filled dummy nests. Females lay 3–10 eggs, incubate for 9–16 days, and young leave the nest after 15–17 days.
Hot, humid summers with thunderstorms.
- Have boxes cleaned and mounted before April — house wrens begin prospecting ahead of egg-laying.
- Use a 1 to 1 1/8 in round entrance on a 4 × 4 in floor, mounted 5–10 ft near shrubs.
- Fit a pole baffle or hole guard; ventilation gaps and drainage holes are essential.
- Clean out old nests after each brood and again after August.
Native Iowa plants that attract house wrens
Of the regional native plants we track for Iowa, these 8 provide food or cover house wrens use:
Early-summer berries arrive exactly when nestlings are being fed.
Acorns plus hundreds of caterpillar species for nestling food.
Drought-hardy prairie oak with large acorns and a heavy insect load.
Summer fruit and one of the top caterpillar host trees.
Late-summer berry clusters taken by over 40 bird species.
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 house wrens through the Iowa year
House wrens rarely visit feeders. They are attracted by brush piles, insect-rich plantings and nest boxes placed near shrub cover.
- Best foods: Mealworms (occasionally).
- Avoid: Seed — house wrens do not eat it.
- In Iowa's summer: offer water and insect foods; natural food is abundant.
Frequently asked
Are house wrens in Iowa year-round?
No. House Wrens are summer breeders in Iowa and leave for the winter.
When do house wrens nest in Iowa?
Nesting in Iowa typically runs May–August, with 2 per season. Clutches are 3–10 eggs, incubated for 9–16 days.
What native plants attract house wrens in Iowa?
Serviceberry, White oak, Bur oak, Black cherry, American elderberry, Spicebush, New England aster, Tall goldenrod are native plants in Iowa that provide food or cover for house wrens.
What size birdhouse hole do house wrens need?
1 to 1 1/8 in round, with a floor of 4 × 4 in mounted 5–10 ft near shrubs.
House Wrens in other regions
Other backyard birds in Iowa
Sources
- House Wren — All About Birds, Cornell Lab of Ornithology
- House Wren life history — Cornell Lab of Ornithology
- House Wren — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
- eBird region overview and bar charts — Iowa
- 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.