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The UK Bird Atlas

Greenish Warbler (Phylloscopus trochiloides)Where and when to see it in the UK

Passage migrant · reporting peaks September · Leaf Warblers · BOU category A

Records to 2026-08-16 · build 2026-08-31

Greenish Warbler (Phylloscopus trochiloides)
Dibyendu Ash, CC BY-SA 3.0, via Wikimedia Commons
Peak months
Greenish Warbler: relative reporting rate by 10 km square, September

Contains OS data © Crown copyright and database right 2026 (grid squares, place names from OS Open Names). Northern Ireland place names: OSNI Open Data, OGL v3.0. County and country boundaries: Office for National Statistics, Open Government Licence v3.0. Coastline: Natural Earth. Bird records from the data partners listed here.

Greenish Warbler has been recorded in 85 of the 2,971 10 km squares covering UK land (3%) in records to 2026. Passage migrant in the UK. Its strongest squares are in Scotland, England and Wales. Reporting peaks in September.

Conservation status: Least Concern (IUCN Red List, LC)
View on the IUCN Red List
Relative to this species' best squares (how classes are calculated)
Very high
21% or more of visits
High
2% to 21%
Moderate
<1% to 2%
Low
under <1%
Surveyed, not recorded
at least 20 qualifying visits, no record
Insufficient records
too few visits to say
Lighter fill
Few visits, lower confidence
Small dot
Occasional: a single record, or out of season

Seasonality

Reporting rate by month, relative to the peak month
MonthRelative to peakShare of visitsTypical class
January 0%<1%Insufficient records
February 0%<1%Insufficient records
March 0%<1%Very high
April 0%<1%Very high
May 4%<1%Very high
June 23%<1%Very high
July 0%<1%Insufficient records
August 81%<1%Moderate
September 100%<1%Low
October 50%<1%Low
November 0%<1%Insufficient records
December 0%<1%Insufficient records

Squares with the highest reporting rate in September

SquareWhereShare of visitsClass
HU31Shetland Islands, Scotland100%Very high
HU32Shetland Islands, Scotland100%Very high
HU46Shetland Islands, Scotland100%Very high
NK05Aberdeenshire, Scotland100%Very high
NZ38Northumberland, England100%Very high
SM70Pembrokeshire, Wales100%Very high
SZ58Isle of Wight, England100%Very high
NK15Aberdeenshire, Scotland26%Very high
NZ62Redcar and Cleveland, England8%High
NZ91North Yorkshire, England5%High

Spotted an error in a square? Report it and it goes into the review queue. Read the methodology for how classes, flags and sensitive-species rules work. Data to 2026.