An owl box is one of the most rewarding ways to welcome wild owls to your yard. As mature trees with natural cavities become scarcer, a well-built owl box gives owls a safe place to roost and raise their young, and it gives you a front-row seat to one of the natural world's quietest hunters. This owl box buyer's guide walks you through what an owl box is, which owls actually use them, how to choose the right one for your yard, where to place it, and when to expect your first residents.
WildYard is a proud member of 1% for the Planet, and our approach to owls is simple: build habitat, follow the science, and let the birds decide. Everything below draws on guidance from the Cornell Lab of Ornithology, the Barn Owl Trust, and Audubon so you can set up your box with confidence.
What Is an Owl Box?
An owl box, also called an owl nest box or owl nesting box, is an enclosed wooden home that mimics the tree cavity where a cavity-nesting owl would naturally raise its young. Owls do not build nests the way songbirds do; they rely on existing hollows, and in many yards those hollows have simply disappeared. A good owl box replaces that lost habitat with the right interior volume, a correctly sized entry hole, drainage, ventilation, and a rough interior surface that fledglings can grip on their way out.
Not every owl uses a box. The species that readily adopt an owl nest box are cavity nesters, chiefly screech owls, barn owls, and northern saw-whet owls. Larger owls such as great horned owls prefer open platforms or reuse old hawk and crow nests, so a traditional enclosed box is not the right home for them.
Which Owls Use Boxes?
Choosing an owl box starts with knowing which owls live near you and which ones will accept a box at all. Here are the species most likely to move in across North America.
Screech Owls
The eastern screech owl (Megascops asio) and western screech owl (Megascops kennicottii) are small, adaptable owls that do well in suburban yards, orchards, and woodland edges. A screech owl box is the most commonly adopted owl box in residential settings because these birds tolerate people and take to boxes readily. Their compact size means a smaller interior and a smaller entry hole than a barn owl needs.
Barn Owls
The barn owl (Tyto alba) is a superb rodent hunter that favors open country: grassland, farmland, and meadow edges. A barn owl box is considerably larger than a screech owl box, with a bigger entry hole and more floor space, and it is best mounted where the birds have open ground to hunt over. If you have acreage or live beside fields, a barn owl box is well worth considering.
Northern Saw-whet Owls
These tiny, secretive owls (Aegolius acadicus) nest in cooler, wooded regions and will use a box sized much like a screech owl's. They are rarely seen, so a well-placed box in the right habitat is often the only way you will know they are present.
Great Horned and Barred Owls
Great horned owls (Bubo virginianus) do not use enclosed boxes; they nest on open platforms or in the abandoned nests of other large birds. Barred owls (Strix varia) will occasionally use very large boxes in mature wet woodland but are far less predictable than cavity nesters. For most yards, a screech or saw-whet owl box is the realistic target.
Owl Box Types by Species
| Owl species | Entry-hole diameter | Mounting height | Best habitat |
|---|---|---|---|
| Eastern / Western Screech Owl | 3 in (7.6 cm) | 10–15 ft (3–4.5 m) | Yards, orchards, woodland edges |
| Northern Saw-whet Owl | 2.5–3 in (6.4–7.6 cm) | 12–15 ft (3.6–4.5 m) | Cool, wooded areas |
| Barn Owl | 6 in (15 cm) | 12–20 ft (3.6–6 m) | Open fields, grassland, farmland |
Figures follow widely used guidance from the Cornell Lab of Ornithology and the Barn Owl Trust. Always match the box to a species that actually occurs in your region.
How to Choose the Best Owl Box
The best owl box is the one matched to your local owls and built to last outdoors. Focus on these features rather than looks alone.
Size and Interior Volume
Match the internal floor area to your target species. A screech owl is comfortable in a box roughly 8 x 8 in (20 x 20 cm) at the base with an interior depth of about 12–15 in (30–38 cm); a barn owl needs far more room. Too large a box for a small owl leaves eggs and chicks exposed; too small a box for a barn owl will simply go unused.
Entry-Hole Diameter
Entry-hole size is the single most important detail. A 3 in (7.6 cm) hole suits screech and saw-whet owls, while a barn owl needs around 6 in (15 cm). A correctly sized hole lets your target owl in while helping keep larger competitors out.
Mounting Height and Material
Plan to mount a screech owl box 10–15 ft (3–4.5 m) up and a barn owl box up to 20 ft (6 m). Choose untreated, weather-resistant timber such as cedar, which handles rain and temperature swings without chemical treatments that could harm the birds. Look for drainage holes in the floor, ventilation gaps near the top, and a roughened or grooved interior below the entrance so fledglings can climb out.
Ease of Cleaning
A side or front panel that opens makes the annual clean-out simple, which keeps the box healthy for future broods. WildYard's Owl Box for Yards is a pre-assembled cedar box designed for screech owls and other small cavity nesters, with a swing door for easy maintenance and internal climbing grooves for fledglings.
Where to Place an Owl Box
Placement matters as much as the box itself. Even a perfect owl box will sit empty in the wrong spot. Follow these guidelines when deciding where to place your owl box:
- Height: Mount screech and saw-whet owl boxes 10–15 ft (3–4.5 m) above the ground; barn owl boxes can go up to 20 ft (6 m).
- Habitat edge: Site the box where woodland meets open ground. Screech owls favor the edges of yards and woods; barn owls need open fields to hunt over.
- Clear flight path: Keep the entrance facing an open approach, away from dense branches, so owls can fly straight in.
- Away from light and noise: Owls are nocturnal and sensitive to disturbance. Choose a quiet spot away from floodlights, patios, and busy walkways.
- Shelter from sun and wind: Face the entrance away from prevailing wind and harsh afternoon sun to keep the interior stable.
- Distance from other boxes: Keep owl boxes well apart from bat houses and from each other, since owls are territorial. See why owl boxes and bat boxes shouldn't mix for details.
For a deeper walkthrough, read our guide on how to attract owls.
When Owls Move In
Patience is part of the process. Some boxes are found within weeks; others take a full season or more before an owl investigates. Nesting timing varies by species and region, but as a rough guide, screech and saw-whet owls typically nest from late winter into early summer, while barn owls may nest from late winter onward and can raise more than one brood in a good year.
Once a box is occupied, keep your distance. Watch from afar for signs such as an adult peering from the entrance at dusk, and resist the urge to open the box during nesting. A single annual clean-out after the breeding season, removing old debris and checking for damage, is all the maintenance most boxes need. Owls that hunt your yard also provide natural rodent control; you can read more about that in our piece on why owl boxes are the best natural pest control.
If screech owls are your likely visitors, our roundup of things you didn't know about eastern screech owls is a good next read.
Frequently Asked Questions
What is an owl box?
An owl box, or owl nest box, is an enclosed wooden home that mimics the tree cavity where cavity-nesting owls raise their young. It provides a safe roosting and nesting site where natural cavities are scarce.
What size entry hole does an owl box need?
Entry-hole size depends on the species. Screech owls and saw-whet owls use a hole about 3 in (7.6 cm) across, while a barn owl needs roughly 6 in (15 cm). Matching the hole to your target owl is the most important design choice.
How high should an owl box be mounted?
Mount a screech owl box about 10–15 ft (3–4.5 m) above the ground. A barn owl box can be placed up to 20 ft (6 m) high. Keep the entrance facing a clear flight path.
Which owls use nest boxes?
Cavity-nesting owls use boxes most readily, chiefly screech owls, barn owls, and northern saw-whet owls. Great horned owls prefer open platforms and do not use enclosed boxes.
Where should I place an owl box?
Place the box at the edge where trees meet open ground, away from bright light and noise, with a clear flight path to the entrance and shelter from wind and afternoon sun. Keep it well apart from bat houses and other owl boxes.
How long before owls use a new box?
It varies. Some boxes attract owls within weeks; others take a season or more. Correct placement and a species-appropriate design give you the best chance of a resident owl.
WildYard is a member of 1% for the Planet. Explore the Owl Box for Yards to give the owls near you a safe place to call home.
