Prothonotary Warbler in April

April is when spring migration hits its stride. Waves of migrants move north on warm southerly winds, wintering birds leave for good, and early nesters are already on eggs in the South. Every week brings species that weren't there the week before.

For the Prothonotary Warbler specifically, April is a spring month inside the nesting season — one of the most active and demanding periods of this bird's year. Across the 26 states and provinces where prothonotary warblers occur, what the bird is doing this month depends heavily on latitude — the details below break it down by band.

Southern states

absent

Mid-latitudes

mostly absent (migration only)

Northern states & Canada

absent

In April, prothonotary warblers are absent in the South, mostly absent (migration only) across the mid-latitudes, and absent in the northern states and Canada. That north–south split is the defining feature of this month: where you live changes which version of this bird you're looking at.

April is inside the Prothonotary Warbler nesting season — about a month earlier in the South and a month later in the North. Nest: tree cavity or nest box standing in or over water. Clutch 3–7 eggs, incubation 12–14 days, 1–2 per season.

In the South the season is already underway, while northern birds are still settling territories — a pair in Florida or Texas may be on eggs weeks before a pair in Minnesota or Ontario has even chosen a nest site. During the nesting months, adults switch to protein-rich foods for their young, become more secretive around the nest site, and often visit feeders in quick, purposeful trips rather than lingering.

Prothonotary Warbler nest box dimensions and mounting →

• Caterpillars, beetles, mayflies and snails

The only eastern warbler that nests in cavities — it readily takes small nest boxes over water.

Migrants arriving after long flights are hungry — feeders can be genuine lifelines during cold, wet spells that suppress insects.

Full Prothonotary Warbler diet guide → · Best feeder for prothonotary warblers →

In April, the best watching is around food rather than the nest — adults make repeated foraging trips and are most visible at dawn and dusk. Give nesting birds space: if a bird is carrying food or scolding you persistently, you're close to a nest and should back off.

If you have a Prothonotary Warbler box up, watch from a distance for comings and goings — steady traffic means an active nest — the box guide below has the exact hole size and mounting height this species needs.

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