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Reed / bush / grass warblers
Pallas's Grasshopper Warbler
Helopsaltes certhiola
Winter visitor + passage migrantHigh timing confidence
Season in Chiang Mai & Lamphun
Regular arrivalOct 31
PeakNov 21
Regular departureMar 6
Prime windowNov 7 – Dec 5
Habitat
- Primary
- Dense wet grass / reed fringe
- Secondary
- Paddies, marsh edges and rough flooded vegetation
- Elevation
- Lowland
Closest practical Chiang Mai option
Huai Tueng Thao (rough wet grass; opportunistic)
~12 kmLow confidence
Where to look
Prime window marks the stronger detected pulse; a second migration pulse may occur.
Evidence & sources
3 checklist/site-confirmed; 0 named district/range or recent-record confirmations; remaining slots use habitat + project public-hotspot evidence.