Sedge Warbler (Acrocephalus schoenobaenus)Where and when to see it in the UK
Status not yet classified · reporting peaks May · Reed Warblers and Allies · BOU category AF
Peak months
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.
Sedge Warbler has been recorded in 1,894 of the 2,971 10 km squares covering UK land (64%) in records to 2026. Its strongest squares are in England, Scotland and Wales. Reporting peaks in May.
Conservation status: Least Concern (IUCN Red List, LC)
View on the IUCN Red List- Very high
- 29% or more of visits
- High
- 11% to 29%
- Moderate
- 4% to 11%
- Low
- under 4%
- 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
Relative to this species' best squares (how classes are calculated)
Seasonality
| Month | Relative to peak | Share of visits | Typical class |
|---|---|---|---|
| January | 0% | <1% | Very high |
| February | 0% | <1% | Very high |
| March | 1% | <1% | Low |
| April | 56% | 10% | Low |
| May | 100% | 19% | Very high |
| June | 70% | 13% | Very high |
| July | 54% | 10% | Very high |
| August | 28% | 5% | Low |
| September | 10% | 2% | Low |
| October | 0% | <1% | Low |
| November | 0% | <1% | Very high |
| December | 0% | <1% | Very high |
Squares with the highest reporting rate in May
| Square | Where | Share of visits | Class |
|---|---|---|---|
| C83 | Causeway Coast and Glens, Northern Ireland | 100% | Very high |
| D02 | Causeway Coast and Glens, Northern Ireland | 100% | Very high |
| D04 | Causeway Coast and Glens, Northern Ireland | 100% | Very high |
| D30 | Mid and East Antrim, Northern Ireland | 100% | Very high |
| H15 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| H32 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| H34 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| H44 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| H98 | Mid Ulster, Northern Ireland | 100% | Very high |
| J04 | Armagh City, Banbridge and Craigavon, Northern Ireland | 100% | Very high |