Garden Warbler (Sylvia borin)Where and when to see it in the UK
Status not yet classified · reporting peaks May · Sylviid 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.
Garden Warbler has been recorded in 1,831 of the 2,971 10 km squares covering UK land (62%) 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
- 20% or more of visits
- High
- 6% to 20%
- Moderate
- 2% to 6%
- Low
- under 2%
- 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 | 0% | <1% | Very high |
| April | 22% | 2% | Low |
| May | 100% | 10% | Very high |
| June | 60% | 6% | Very high |
| July | 18% | 2% | Low |
| August | 17% | 2% | Low |
| September | 12% | 1% | Low |
| October | 3% | <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 |
|---|---|---|---|
| H15 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| H32 | Fermanagh and Omagh, Northern Ireland | 100% | Very high |
| HU34 | Shetland Islands, Scotland | 100% | Very high |
| HU35 | Shetland Islands, Scotland | 100% | Very high |
| HU37 | Shetland Islands, Scotland | 100% | Very high |
| HU69 | Shetland Islands, Scotland | 100% | Very high |
| J02 | Newry, Mourne and Down, Northern Ireland | 100% | Very high |
| J35 | Newry, Mourne and Down, Northern Ireland | 100% | Very high |
| J49 | Mid and East Antrim, Northern Ireland | 100% | Very high |
| NF19 | Na h-Eileanan Siar, Scotland | 100% | Very high |