Uncommon resident.

The Mistle Thrush benefited from the establishment of verges and parks in towns during the 1950s and 1960s, and from the planting of trees and shrubs by local authorities. National populations increased during the 1970s but having leveled out or declined slightly since the mid-1980s, nationally the breeding population is now in decline.

The 1973 Breeding Atlas confirmed breeding from seven of the tetrads covering Stevenage, the 1992 Atlas from 10 and, the 2012 Atlas from just one.

Fledged young were seen at Watery Grove in 2016 and Aston End in 2020.

Mistle Thrushes suffer in hard winters, and were badly affected by the winters of 1878/79 and 1880/81. During the winter of 1962/63 their numbers were reduced by 75%.

The 2012 Winter Atlas confirmed their presence from seven of the tetrads covering Stevenage.

The largest flocks recorded are: 12 by Box Wood on 8 April 1973; 11 behind Stevenage College of Further Education (now Asda Supermarket) on 22 August 1975; 19 near Astonbury on 31 July 1978; 13 at Shephalbury Park on 16 March 1979; 10 at Watery Grove on 13 October 1980.

At Watery Grove, the Common Bird Census recorded them annually between 1972 and 1999, with single breeding territories being held in 11 of the years.