Massive sargassum influx events have continued to plague the Caribbean over the last decade, yet there are very few examples of sustained monitoring of beached sargassum anywhere. This information is needed to inform management efforts, to validate sargassum forecasts, and to inform entrepreneurs looking to use the seaweed. In an attempt to address the dearth of monitoring programmes, we have developed a simple, rapid sargassum monitoring protocol (SMP) using drones to encourage widespread, standardized monitoring of beached sargassum volume across the region. The SMP uses rapid field survey measurements combined with ‘off-the-shelf’ drones and a cloud-based drone photogrammetry software SaaS analysis platform that does not require the user to have any GIS expertise or specialised computer power in order to provide both an accurate and non-technical, standardized workflow to visualize and estimate the abundance of freshly beached sargassum. Furthermore, we have developed free access, easy-to-follow, illustrated guides for this SMP with drones, as well as one for use without drones, and are delivering online training under the SargAdapt Project. This easy-to-implement SMP requires only limited time, labour and technical expertise, thus making it accessible to a broad range of stakeholders across the Caribbean.