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Leaf & forest warblers

Arctic Warbler

Phylloscopus borealis

Winter visitor + passage migrantLow timing confidence

Season in Chiang Mai & Lamphun

Regular arrivalOct 18
PeakOct 10
Regular departureFeb 27
Prime windowSep 26 – Oct 24

Habitat

Primary
Forest edge / woodland
Secondary
Gardens / secondary growth on passage
Elevation
Lowland–foothill

Closest practical Chiang Mai option

Doi Suthep–Pui NP (lower–mid slopes)
~8–18 kmHigh confidence

Where to look

  1. Doi Lang
  2. Chiang Dao Wildlife Sanctuary
  3. Mae Ping National Park

Regular arrival unresolved; first 2025/26 record shown. Regular departure unresolved; last 2025/26 record shown. Prime window marks the stronger detected pulse; passage migrants may also show a secondary autumn or spring pulse.

Evidence & sources

2 checklist/site-confirmed; 0 range/record-confirmed; remaining slots use habitat/elevation + project effort proxy.

Biological/status source