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In page History of the Netherlands:

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The Germanic tribes originally inhabited southern Scandinavia, Schleswig-Holstein and Hamburg,[1] but subsequent Iron Age cultures of the same region, like Wessenstedt (800–600 BC) and Jastorf, may also have belonged to this grouping.[2] The climate deteriorating in Scandinavia around 850 BC to 760 BC and later and faster around 650 BC might have triggered migrations. Archaeological evidence suggests around 750 BC a relatively uniform Germanic people from the Netherlands to the Vistula and southern Scandinavia.[1] In the west, the newcomers settled the coastal floodplains for the first time, since in adjacent higher grounds the population had increased and the soil had become exhausted.[3]