Why late spring sounds so full

By the middle of May, the dawn chorus reaches its annual peak across Britain. The reason is simple arithmetic: the resident birds that have been singing since February are still holding territories, and they have now been joined by the summer migrants arriving from Africa — blackcaps, whitethroats, willow warblers, garden warblers, sedge warblers, spotted flycatchers and more. For a few short weeks you get both casts on stage at once.

It will not last. By late June many males have paired up and are busy feeding chicks rather than singing, and by July the woods go quiet as birds moult. The window from roughly 10 May to 10 June is the richest, and the first half of that window is the richest of all.

The hour before sunrise

The chorus is not a single event but a sequence, and knowing the order transforms what you hear. There is a rough timetable, though weather and latitude shift it by twenty minutes either way.

• About 90–60 minutes before sunrise: robins and blackbirds begin, often while it is still genuinely dark. Robins frequently sing through the night under street lighting, so you may hear one before you even leave the house.
• 60–40 minutes before: song thrushes join in, and mistle thrushes. This is the point where the sound starts to feel layered rather than sparse.
• 40–10 minutes before: the warblers arrive — blackcap, chiffchaff, willow warbler, garden warbler, whitethroat — along with wrens, which manage a volume that seems physically impossible for their size.
• Around sunrise: tits and finches fill out the texture: great tit, blue tit, chaffinch, goldfinch, greenfinch, goldcrest.
• After sunrise: woodpigeons and collared doves add their lazy cooing and the whole thing thins out. By 8am in late May, most of it is over.

In southern England, sunrise in mid-May falls around 5.10am, so aim to be in position by 3.45am. In northern Scotland, expect it up to an hour later. Check the exact time for your location the night before and work backwards.

Choosing your spot

The best listening site is not necessarily the most scenic one. What matters is structure: a mix of mature trees, scrub, hedgerow and, ideally, water within a few hundred metres. That variety gives you nesting habitat, songposts and feeding areas in one place, which means more species singing at once.

• Woodland edge and rides, rather than deep interior, where sound is muffled.
• A hedgerow-lined lane or old green lane with tall trees at intervals.
• Wetland margins where reed and sedge warblers sing from the stems, backed by scrub.
• A large park or cemetery with mature trees — surprisingly good, and easy to reach before dawn.

Avoid anywhere with traffic noise, which masks the high frequencies of warblers and tits far more than you would expect. Pick a still, dry, mild morning with little wind; a light overcast is fine and often better than hard clear skies. Cold, wet or windy nights produce a noticeably quieter chorus.

What you are actually hearing

Once the sound builds, the temptation is to hear one great wall of noise. Try instead to follow single voices.

The blackbird gives you the benchmark: rich, unhurried, flute-like phrases with a lazy pause between them. The song thrush is louder and more emphatic, repeating each phrase two or three times over, like someone practising a line. The mistle thrush sounds like a blackbird in a hurry, wilder and less tuneful, often singing from the very top of a tree.

The warblers are the tricky ones. Chiffchaff says its own name, relentlessly. Willow warbler lets a silvery phrase tumble downwards. Blackcap is a hurried, scratched fluty warble that starts sweetly and ends untidily. Garden warbler is an even, rapid burble with no clear shape at all, and whitethroat is a short, scratchy jingle delivered from the top of a bramble.

Above them, the great tit insists on its two-note saw-sharpening, the chaffinch delivers a downward flourish ending in a flourish of chips, and the wren produces a rattling burst with a hard trill on the end. Listening for the gaps and repetitions is what separates them, not the pitch alone.

Kit, comfort and technique

• Layers, hat and gloves. It is cold at 4am in May, and standing still makes it colder.
• A flask. Tea or coffee keeps you in one place long enough to hear the full sequence.
• A torch, ideally with a red or low setting so you do not ruin your night vision.
• Binoculars for once it is light enough to put a face to a voice.
• No playback. Do not use recordings to lure birds in. It disturbs territory-holding males at the busiest point of their year.

Sit still with your back to the east so you can watch the light rise in front of you. Cup your hands behind your ears to gather sound, and try the trick of deliberately focusing on one voice at a time, then widening out again. Move slowly. Rustling waterproofs and crunching gravel will undo twenty minutes of listening.

Listening well, and leaving no trace

Late spring is also peak nesting season, so keep to paths, keep dogs close and out of undergrowth, and never trample what looks like rough grass — it may be a lapwing, skylark or meadow pipit nest. Go with a friend and split the listening: one of you follows the thrushes and low singers, the other tracks the warblers. Write down what you hear in order, and you will find your own timing gets sharper each spring.

It costs nothing, requires no equipment worth mentioning, and happens whether or not anyone is there to hear it. Set the alarm, step outside, and let the hour before sunrise do the rest.