This review summarises five decades of shellfish seasonality research in archaeology, drawing on over 70 studies across more than 400 sites. It evaluates methods ranging from external growth analysis to high-resolution isotope and elemental approaches, highlighting persistent gaps, regional biases, and the critical importance of modern reference datasets. Several historic studies are re-examined to revive overlooked methodological innovations, and a path forward is proposed to enhance the reliability and coverage of future seasonality analyses.