Scarce passage migrant.

Because of lack of suitable habitat, Reed Warblers are scarcely seen at Stevenage.

Between 1979 and 2015 there were 10 records: five passage birds ringed at Box Wood between 12 August and 23 September 1979; two passage birds ringed at Box Wood on 1 July and 1 August 1980; one at Astonbury on 14 May 1989; one at the now demolished Angotsmead House in Meadway on 7 April 1996; a singing bird in a garden in 1997; one at Fairlands Valley Lakes on 26 April 1997; one in Ditchmore Lane on 29 May 2008; one in the Old London Road behind the Magistrates Court on 20 and 21 May 2009; one at Norton Green Tip on 28 April 2010; One at Fairlands Valley Lakes on 29 July 2015.

With no records between 2015 and 2021 there has since been an increase in records with: one at Fairlands Valley Lakes on 28 and 29 April 2021; two at Fairlands Valley Lakes on 2 May 2021; one at Fairlands Valley Lakes on 7 May 2021; one at the River Beane, Aston on 14 June 2021; one at Fairlands Valley Lakes on 7 June 2022; one at Fairlands Valley Park on 27 May 2023; one at Fairlands Valley Lakes from 9 to 16 June 2023; one at Fairlands Lakes on 25 and 26 July 2023; one at Norton Green Tip on 3 September 2023

A ring of a Reed Warbler ringed at Thrybergh, South Yorkshire on 23 August 1990, was found at Stevenage on 22 May 2011. Whilst Reed Warblers can live for over 10 years, as there are no details of how the ring was found it cannot be assumed that the “ringed” bird was over 20 years old.