Agroforestry for forage production is a promising solution to provide additional tree-based forage during periods of drought-induced forage losses in grasslands. However, the yield and chemical composition of fodder tree leaves remain poorly studied in temperate climates. To address this, we planted fodder tree hedgerows at six sites with different pedo-climatic conditions in western Switzerland in 2021. The hedgerows included six species: Morus alba, Fraxinus ornus, Tilia cordata, Tilia platyphyllos, Salix caprea and Alnus cordata. In August 2024, we calculated basal area (BA) and estimated leaf biomass production of 20 individuals per species per site. The leaves of each species were also collected at each site, and their chemical composition was analysed. On average, A. cordata had the greatest leaf biomass (334 g DM for a BA of 15 cm2), followed by F. ornus, S. caprea, M. alba, T cordata and T. platyphyllos (94 g DM for a BA of 15 cm2). M. alba had the leaves with the highest CP and Ca content and lowest fibre content whereas A. cordata had the highest fibre and lowest P contents. Altogether, our findings highlight the potential of tree leaves to provide additional forage sources in late summer across a range of climatic conditions.