The formulation and implementation of climate adaptation plans in cities worldwide needs to speed up rapidly to keep in pace with projections of climate risks. The research project: "Resilience in Europe through Activating City Hubs reaching Out to Users with Triple-A climate adaptation Tools" (REACHOUT) aims to support the implementation of the European Green Deal by developing user-oriented climate services. It is funded through the European Commission's Horizon 2020 programme. Research partners, climate service providers and city stakeholders are co-developing a coherent set of tools and services for seven City Hubs (Cork, Ireland; Athens, Greece; Lillestrøm, Norway; Milan, Italy; Logroño, Spain; Gdynia, Poland; and Amsterdam/APG, the Netherlands).