Uncommon resident and winter visitor.

Coal Tits are vulnerable to cold weather, and were badly affected in Hertfordshire during the winter of 1978/79.

They were confirmed as breeding in two of the town’s tetrads in the 1973 Breeding Atlas, from seven in the 1992 Atlas and, from five in the 2012 Atlas.

A bird was seen collecting nesting material in the Old Town in 2016 and, fledglings were reported from central Stevenage in 2018 and, at Fairlands Valley Park in 2019, with breeding confirmed there in 2021 and fledglings seen in 2022 and 2023.

The 2012 Winter Atlas confirmed their presence from 10 of the tetrads covering Stevenage.

The Common Bird Census recorded their presence annually during the breeding season at Watery Grove between 1973 and 1979, with single territories being held in 1973 and 1979. The Census did not record them again until 1985 from when they annually held between one and two territories until 1998, with the exception of 1986, 1988, 1990, and 1997 when only their presence was recorded.

A juvenile ringed at Box Wood in 1971 was seen nest building in the wood on 22 April 1972. 31 birds were ringed at Box Wood in 1979.