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The UK Bird Atlas

Pallas's Warbler (Phylloscopus proregulus)Where and when to see it in the UK

Status not yet classified · reporting peaks October · Leaf Warblers · BOU category A

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

Pallas's Warbler (Phylloscopus proregulus)
christoph_moning, CC BY 4.0, via Wikimedia Commons
Peak months
Pallas's 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.

Pallas's Warbler has been recorded in 138 of the 2,971 10 km squares covering UK land (5%) in records to 2026. Its strongest squares are in England, Scotland and Wales. Reporting peaks in October.

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
13% or more of visits
High
2% to 13%
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 17%<1%Low
February 13%<1%Very high
March 5%<1%Low
April 1%<1%Low
May 0%<1%Insufficient records
June 0%<1%Insufficient records
July 0%<1%Insufficient records
August 0%<1%Insufficient records
September 0%<1%Moderate
October 100%<1%Very high
November 32%<1%Moderate
December 7%<1%High

Squares with the highest reporting rate in October

SquareWhereShare of visitsClass
HP60Shetland Islands, Scotland100%Very high
HU28Shetland Islands, Scotland100%Very high
HU35Shetland Islands, Scotland100%Very high
HU38Shetland Islands, Scotland100%Very high
HU59Shetland Islands, Scotland100%Very high
NK15Aberdeenshire, Scotland100%Very high
NT96Scottish Borders, Scotland100%Very high
NZ53Hartlepool, England100%Very high
NZ71North Yorkshire, England100%Very high
SC16Isle of Man100%Very 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.