Prothonotary Warbler in September
Where prothonotary warblers are in September, whether they are nesting, and the best foods to offer right now.
September in the Prothonotary Warbler's year
September is the peak of fall migration. Huge numbers of birds move south on cold fronts, mixed flocks form, and summer residents slip away almost unnoticed. Young birds making their first migration appear in places the species rarely visits.
For the Prothonotary Warbler specifically, September is a fall month of relative routine, with the species settled into its seasonal pattern across its range. 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.
Where prothonotary warblers are in September
- Southern states
- absent
- Mid-latitudes
- mostly absent (migration only)
- Northern states & Canada
- absent
In September, 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.
Nesting in September
Prothonotary warblers are not nesting in September. The season runs April–June at mid-latitudes.
That makes September a useful month for nest-box work: cleaning out old nesting material, checking mounts and predator guards, and making repairs while boxes are empty. A box that's ready early gets claimed early.
What to feed in September
- Caterpillars, beetles, mayflies and snails
The only eastern warbler that nests in cavities — it readily takes small nest boxes over water.
Migrants passing through may stop at feeders for a day and never return — September rewards watching closely. Natural seed and fruit crops are abundant, so feeder traffic can be uneven.
Full Prothonotary Warbler diet guide → · Best feeder for prothonotary warblers →
Watching prothonotary warblers this month
Prothonotary warblers are settled and predictable in September, which makes this a good month to learn the bird's routine — same feeders, same perches, same times of day.
If you have a Prothonotary Warbler box up, this is the month to make sure it's clean, secure and ready — the box guide below has the exact hole size and mounting height this species needs.
Prothonotary Warbler month by month
Prothonotary Warbler by state
Frequently asked
Where are prothonotary warblers in September?
In September, prothonotary warblers are absent in the South, mostly absent (migration only) across mid-latitudes and absent in the North.
Do prothonotary warblers nest in September?
No — prothonotary warblers typically nest April through June at mid-latitudes.
What do prothonotary warblers eat in September?
Caterpillars, beetles, mayflies and snails.
Sources
- Prothonotary Warbler — All About Birds, Cornell Lab of Ornithology
- Prothonotary Warbler life history — Cornell Lab of Ornithology
- Prothonotary Warbler — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
Timing reflects typical patterns for the region as a whole; local dates vary with elevation and year. Check the linked eBird bar charts for your county.