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The anadromous life cycle of Atlantic salmon Salmo salar involves long migrations to novel environments and challenging physiological transformations when moving between salt‐free and salt‐rich waters. In this article, (1) environmental factors affecting the migration behaviour and survival of smolts and post‐smolts during the river, estuarine and early marine phases, (2) how behavioural patterns are linked to survival and (3) how anthropogenic factors affect migration and survival are synthesized and reviewed based on published literature. The timing of the smolt migration is important in determining marine survival. The timing varies among rivers, most likely as a consequence of local adaptations, to ensure sea entry during optimal periods. Smolts and post‐smolts swim actively and fast during migration, but in areas with strong currents, their own movements may be overridden by current‐induced transport …