Screech Owls and Nest Boxes: How to Attract a Small Backyard Owl

Most backyard owl sightings are brief and passive: a great horned owl passing through, or a barred owl calling from a distant treeline. Screech owls are the exception. Small enough to nest in a cavity barely larger than a coffee can, both the eastern and western species readily accept a properly built nest box in a yard with even modest tree cover, making them one of the very few owls a suburban property can realistically host as an actual nesting resident rather than an occasional visitor.

Why Nest Boxes Work So Well for This Species

Screech owls are cavity nesters by nature, historically dependent on old woodpecker holes and natural hollows in mature trees. Suburban development has reduced the supply of standing dead and dying trees, the main natural source of those cavities, faster than it has reduced the owls' actual habitat range, which leaves a genuine shortage of nest sites in many neighborhoods that otherwise have suitable hunting habitat nearby. A well-placed box fills that specific gap rather than trying to attract an owl to a fundamentally unsuitable area.

Box Dimensions and Placement

• Entrance hole roughly 3 inches in diameter — large enough for the owl, small enough to exclude most larger predators and competing cavity nesters
• Interior floor space around 8 by 8 inches, depth 12 to 15 inches — enough room for a full clutch and growing chicks without excess empty space that loses heat
• Mounted 10 to 20 feet up a tree trunk — angled slightly forward so rain drains away from the entrance rather than pooling inside
• No perch below the entrance — a perch gives raccoons and other climbing predators an easy foothold to reach into the box
• A few inches of wood shavings on the floor — owls do not build nests and rely on loose bedding material for the eggs to rest on

Red and Gray: Two Color Morphs, One Species

Eastern screech owls occur in two distinct color morphs, a rich rufous-red form and a mottled grey form, present within the same population and even within the same brood rather than corresponding to different regions or subspecies. Both morphs use the same nest boxes and behave identically; the color difference is a genetic polymorphism thought to offer a slight camouflage advantage against different bark textures and lighting conditions, meaning a single clutch of eggs in one box can produce a mix of red and grey chicks. Western screech owls, found across the drier parts of the West rather than overlapping with the eastern species, are more uniformly grey and lack this same red morph.

What Occupancy Looks Like

A box in active use rarely shows much visible activity during the day; screech owls roost quietly inside, sometimes with just a portion of the face visible at the entrance hole in bright daylight. The more reliable evidence is auditory: the eastern screech owl's descending whinny call and soft trill, typically most active around dusk and again before dawn, are usually the first sign a box has been adopted well before any visual confirmation. Whitewash streaking below the entrance and small pellets on the ground beneath the box are the other common physical signs of occupancy.

The Cornell Lab of Ornithology maintains detailed nest box specifications and placement guidance for screech owls as part of its broader cavity-nester resources, and recommends installing boxes in late fall or winter so they are already weathered in and scent-neutral by the time owls begin scouting territory in late winter.

A screech owl box that goes quiet for a season is not necessarily a failure—pairs shift between multiple cavities across their territory from year to year, and a box passed over once is often used the next.

Compared to the larger owls covered in our backyard raptor guide, screech owls are the species most yards can realistically host through direct habitat provision rather than simply observing from a distance, which makes a well-placed box one of the more concrete, actionable wildlife projects available to a typical suburban property.

A box that sits empty its first year is not necessarily poorly placed; owls often need a full season to discover and grow comfortable with a new cavity, and checking placement, height, and predator-guard details against established specifications before assuming the location itself is the problem is worth doing before moving or replacing a box.