While many people still think of February as a dead month in the garden, birds are already planning their nesting season. A single, fairly easy task around your nest boxes can tip the balance between thriving chicks and entire broods wiped out by parasites or cold.
February is nesting house-hunting season
Humans are still wrapped in scarves, but for many garden birds, February is moving month. Pairs are forming, territories are being argued over, and potential nesting sites are inspected with obsessive attention.
Species that rely on cavities, such as blue tits, great tits and redstarts, are among the first to start looking. They cannot afford to wait until April. By then, the best holes in old trees or buildings are already occupied, and competition is fierce.
By mid-February, cavity-nesting birds are already visiting and testing potential nest boxes, long before they lay their first egg.
In towns and suburbs, where mature hollow trees are rare, a garden nest box can make the difference between a successful breeding season and no chicks at all. Waiting until spring to hang one up is simply too late for many species. They will either settle elsewhere or be forced into unsafe spots vulnerable to cats, crows or bad weather.
The crucial job: cleaning last year’s nest
For anyone who already has a nest box fixed to a tree, fence or wall, February is the time for a thorough clean-out. This is not a decorative chore; it is a basic health measure for birds that will use your garden year after year.
Old nests left inside the box act like a winter hotel for parasites. Fleas, mites and other tiny insects hide in the moss, feathers and droppings, waiting for the warmth of new chicks. Once the brood hatches, they feed relentlessly on the nestlings, weakening them and sometimes killing entire clutches.
Skipping the annual clean can turn a safe-looking nest box into a parasite trap for newly hatched chicks.
How to clean a nest box safely
- Open the box and remove all old nesting material with gloved hands.
- Use a stiff brush to scrub every surface, including corners and the roof.
- Rinse with very hot or boiling water to kill remaining parasites and bacteria.
- Leave the box to dry completely in the open air before closing it again.
- Put it back up quickly so birds can keep it on their shortlist of sites.
Chemical cleaners and disinfectants should not be used. Even small residues can be harmful to chicks and adults, especially in the confined air of a wooden box.
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Choosing a new nest box: size really matters
If your garden has no nesting sites yet, February is an excellent month to install some. But not every “cute” box sold in garden centres is actually suitable for birds. Shape, entrance size and materials all decide which species will feel safe enough to move in.
The diameter of the entrance hole acts like a security filter, deciding who gets in and who stays out.
Recommended entrance sizes for common garden birds
| Entrance type | Typical diameter | Species attracted |
|---|---|---|
| Small round hole | 26–28 mm | Blue tit, coal tit, marsh tit and similar tiny species |
| Medium round hole | 32–34 mm | Great tit, house sparrow, nuthatch |
| Semi-open front | Wide opening | Robin, spotted flycatcher and birds preferring more open cavities |
The best boxes are made from untreated, fairly thick wood such as larch, oak or cedar. A thickness of around 1.5 cm or more provides insulation from cold nights and sudden spring heat. Thin, decorative boxes may look attractive but often overheat or rot quickly.
Metal models are another frequent problem. In direct sun they can turn into ovens, overheating chicks in a matter of hours. Very bright colours are not helpful either; neutral tones blend better into the surroundings and attract less attention from predators.
Placement: orientation can mean life or death
Even the best-designed box will fail if it is placed in the wrong spot. Birds assess several factors when they “visit” a nest box: exposure to wind and rain, risk of predators, distance to food, and heat during the day.
A nest box facing the wrong way can turn from shelter into hazard after just one storm or hot spell.
Where and how to fix a nest box
Most ornithologists advise placing the entrance facing east or south-east. This positioning limits direct exposure to driving rain and strong prevailing winds, which in many regions come from the west. It also offers gentle morning sun without the full blast of afternoon heat.
Height is another key factor. Between 2 and 3 metres suits most common garden birds. At this level, the nest stays out of reach of roaming cats and curious children but can still be reached once a year with a ladder for cleaning.
The box should be fixed firmly to a tree trunk or solid wall, using a hook, strong wire or screws. A slight forward tilt helps rainwater run off and stop it seeping through the entrance. Branches directly in front of the hole should be trimmed back, as they may provide perches for predators such as cats, squirrels or magpies.
Why acting now boosts both birds and your garden
Timing plays a subtle role. Boxes set up or cleaned in February have time to lose strong human scents and to blend visually with bark, bricks or foliage. This makes them feel safer to cautious birds that inspect every corner.
The payoff goes beyond the pleasure of watching nestlings fledge in spring. A single family of tits can eat thousands of caterpillars, grubs and insects over a few weeks to feed their hungry brood. This natural pest control helps protect fruit trees, vegetable beds and ornamental borders without using chemicals.
Well-placed, clean nest boxes turn garden birds into working allies against common pests.
Common mistakes people make with nest boxes
Even well-meaning garden owners sometimes sabotage their own efforts. A few pitfalls come up again and again in ornithologists’ field notes:
- Placing a box in full, all-day sun, which can lead to heat stress for chicks.
- Hanging it too low, within easy jumping distance for cats.
- Opening the box repeatedly during nesting, causing disturbance and abandonment.
- Using smooth, shiny finishes on the entrance, making it hard for birds to grip.
- Installing boxes near very bright lights or heavy foot traffic at night.
A simple rule helps: imagine raising a baby in that spot during a week of rain followed by a heatwave. If the site feels exposed, too noisy or too hot for a human infant, it is likely poor for chicks as well.
Key terms and real-life scenarios
Gardeners often hear the word “cavity nester” without a clear picture of what it means. It refers to species that naturally choose holes in trees, walls or rock faces for breeding. They do not build free-hanging nests in bushes or hedges. By installing nest boxes, you are effectively replacing old, hollow trees that have been removed for safety or building projects.
Another useful term is “predation pressure”. In an area with many cats, corvids or squirrels, small details such as the angle of the box, the lack of nearby perches or even a metal predator guard around a tree trunk can change the odds dramatically.
Imagine two neighbouring gardens. One leaves last year’s nest in place, with the box facing west in full afternoon sun. The other cleans the box, turns it towards the east and trims nearby branches. Both gardens get a nesting pair. After a week of heavy rain followed by a warm spell, the first brood struggles with damp and parasites, and only one or two chicks survive. In the second garden, all chicks fledge successfully. The difference comes down to that single, carefully timed February task.
Adding bird-friendly plants close to your boxes multiplies the benefits. Berry-producing shrubs, native trees and pesticide-free lawns increase insect life, giving parents shorter foraging trips. Less time away from the nest means fewer chances for predators to strike, and more food delivered per hour to growing chicks.