Uncommon summer visitor and passage migrant.

Foster (1914) recorded that Garden Warblers had been, “Reported from the Stevenage District”.

In 1964 20 pairs were reported from Box Wood. Other records for the 1960s came from Chesfield and a Rockingham Way Garden.

In the 1970s and 80s records came from: Astonbury Wood; Box Wood; Brooches Wood; Fairlands Valley Lakes; Hertford Road; Monks Wood; New Wood, Aston End; Watery Grove; Whomerley Wood.

19 were ringed in Box Wood during 1979 seven of which had brood patches indicating breeding in the wood.

In the 1990s they were recorded from: The Football Ground, Broadhall Way; Norton Green; Watery Grove.

Since 2000 they have been recorded from: Fairlands Valley Lakes and Park; Norton Green, Norton Green Tip; Shackledell, Upper Kitching Spring; Watery Grove; Whomerley Wood.

The 1973 Breeding Atlas confirmed breeding from four of Stevenage’s tetrads and, the 1992 Atlas from five. The 2012 Atlas only considered breeding as possible from the tetrad covering Norton Green.

The Common Bird Census at Watery Grove recorded them holding between one and three breeding territories annually between 1972 and 1999, with the exception of 1986 and 1998 when only their presence was recorded.

The earliest spring arrival date at Stevenage is 4 April 2002 at an unknown location, the latest departure date is 21 September 2020 at Norton Green.

There is a winter record of a one seen in a York Road garden on 27 February 1974. This was the first occurrence of an over wintering Garden Warbler in Hertfordshire.