Uncommon passage migrant, which has bred.
In 1878 they were considered, to be scarce in Hertfordshire and, were described as not being common in the Stevenage district by Foster (1914).
Nationally since 1970 Yellow Wagtails have declined by 60% due to the loss of suitable breeding habitat.
They have been seen on spring and autumn migration at, Aston End, Astonbury Farm, Bragbury End, Chells Manor, Fairlands Valley and Lakes, Mobbsbury area of Chells, Norton Green Tip, Potters Spring, St Nicholas Park, Tilekiln Farm, Walkern Road and, Whomerley Wood (one seen by the Moat on 6 October 1974).
The largest flocks seen on migration are 12 at Fairlands Valley Lakes on 16 September 1996, 12 at St Nicholas Park on 20 September 2000 and 12 at Norton Green Tip on 1 September 2020.
The earliest spring arrival date at Stevenage is 25 March 2022 at Six Hills Way, and a late migrant was recorded from at the Moat in Whomerley Wood on 6 October 1974.
A pair bred at the old sewage works (now the Roaring Meg Retail Park) in 1966.
The 1973 Breeding Atlas considered breeding as possible from one tetrad covering the town, the 1992 Breeding Atlas considered breeding as possible from two tetrads and, the 2012 Breeding Atlas considered breeding as probable from the tetrad covering Chells Manor.
Recent summer and breeding records: Chesfield Park: breeding in 2013 and five seen on 24 August 2025; Fairlands Valley Lakes: one on 6 June 2022; Norton Green Tip: 14 juvenile birds seen on 17 June 2008, two birds seen on 14 and 29 July 2014 and an adult and three juveniles on 28 August 2014, one on 11 June and 25 June 2015 and, confirmed breeding that year with a juvenile seen on 21 July, one on 19 June 2016, three juveniles seen in a Cereal Field nearby on 15 August 2017, a juvenile seen on 26 June 2018, one flying over on 27 August 2022; the Bridle path between Bragbury End and, Knebworth: two seen on 1 June 2020; Potters Spring: single birds seen on 21 and 25 July 2017, four plus birds seen on 20 June 2022, single birds on 3 and 25 July 2022 and, two on 27 June 2023.
