Observed arrival · 2026-11-10
WhenToBird’s week-by-week migration map
An interactive map uses birders’ checklists to show where different bird species are being reported across the US, by week and county.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Birders planning when and where to look
- Worth noticing
- The map explicitly distinguishes checklist share from bird counts: it reflects where people watch, not how many birds are present.
Field notes
The map shades each county by the share of complete checklists that include a species, blending neighboring weeks to smooth the timing view. Grey marks places with too few checklists, and the page cautions that reporting patterns track where people watch rather than bird abundance. A playback control runs through the year; separate sections list recent rises in checklist share, state-by-state arrival dates, and feeder timing guides.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue