The Centre for High-Performance Scientific Computing in Terrestrial Systems (HPSC TerrSys) offers a fall school from 8-12 September 2025 in Juelich, Germany. The course is aimed at Master's and Ph.D. students as well as PostDocs interested in Terrestrial Modelling and High-Performance Scientific Computing. The school is supported by Geoverbund ABC/J and the Collaborative Research Centre CRC1502 'DETECT'.