This article introduces the Mapping Attitudes, Perceptions and Support (MAPS) dataset, which provides rich survey data from more than 12,000 respondents in Colombia. Our panel survey – carried out in two separate waves in 2019 and 2021 – is representative at the level of each ‘Program for Development with a Territorial Focus’ (PDET, for its acronym in Spanish), the most war-affected regions and those targeted for peace agreement implementation. We describe the sample and compare support for the peace agreement in MAPS to other recent surveys in Colombia, showing how MAPS reveals regional variation obscured in nationally representative surveys. Regression analyses illustrate how the panel data allow us to explore how and why people’s perceptions of the agreement shift over time. The MAPS data will enable scholars to gain insights into the microfoundations of peacebuilding over time and across space.