Nest Box Guide: How to Attract Nesting Birds to Your Yard
The right box, in the right spot, brings chickadees, bluebirds, wrens, and more to nest in your yard. Learn hole sizes, placement, and predator protection.
Watching a pair raise a family in a box you provided is one of birding's great joys. Cavity-nesting birds — chickadees, bluebirds, wrens, swallows, and others — will use nest boxes if you match the box and placement to the species.
The entrance hole determines the tenant
- 1 1/8 inch: chickadees and wrens (also excludes House Sparrows).
- 1 1/2 inch: Eastern Bluebird, Tree Swallow, titmice.
- 1 9/16 inch: Western and Mountain Bluebirds.
- Larger boxes and holes serve flickers, screech-owls, and Wood Ducks.
Build or buy a good box
A proper box has untreated wood, ventilation holes near the top, drainage holes in the floor, a roof that overhangs the entrance, an easy-open side for monitoring and cleaning, and no exterior perch (perches only help predators and competitors).
Placement
Mount boxes on a smooth metal pole (easier to protect than a tree) at the right height for the species, facing away from prevailing wind and harsh afternoon sun. Space boxes appropriately — many birds are territorial — and put bluebird/swallow boxes in open areas, wren/chickadee boxes near some cover.
Protect against predators
A pole-mounted predator baffle is essential to stop raccoons, snakes, and cats from raiding nests. Avoid mounting on trees or fences that give climbing predators easy access.
Monitor responsibly
Quick weekly checks are fine and help you track progress and manage invasive House Sparrows; consider joining NestWatch to contribute your data to science. Clean boxes out between broods and after the season. Log each nesting attempt in Birder AI to follow your yard's families year over year.
Frequently asked questions
What size entrance hole should a nest box have?+
It depends on the target species: 1 1/8 inch for chickadees and wrens, 1 1/2 inch for Eastern Bluebirds and Tree Swallows, and 1 9/16 inch for Western/Mountain Bluebirds. Smaller holes also help exclude invasive House Sparrows and starlings.
Should a nest box have a perch?+
No. An external perch isn't needed by the birds and only makes it easier for predators and aggressive competitors like House Sparrows to access the box. Choose or build boxes without perches.