The Celtic field research programme of Groningen University involves research excavations of Dutch Celtic fields or raatakkers: embanked field plots thought to date to the Iron Age (c. 800 cal bc–12 bc). In this paper, detailed attention is given to (a) the palaeoecology of raatakkers; (b) the relationship between habitation and agriculture in such systems; and (c) their dating and use-life. Counter-intuitively, it is argued that the macro-remains from crops such as barley, wheat, millet, and flax recovered from Celtic field banks represent a non-local (settlement) signal rather than document local agricultural regimes. Palynological approaches, in which a more local signal can be preserved but which also show evidence for details of the agricultural regime such as manuring strategies and fallow cycles, are argued to be more appropriate avenues to study local agricultural strategies. A discussion of the relations between habitation and agriculture shows that house sites uncovered within Dutch Celtic fields are almost invariably placed in positions partly overlapping banks. Moreover, in most cases such settlement traces appear to date to the Middle or Late Iron Age, raising the question of where the initial farmers of the Celtic fields lived, as the communities planning and first using these Celtic fields probably pre-dated the Iron Age. A critical review of existing dates and discussion of new OSL and AMS dates has shown that bank construction of Dutch Celtic fields started around the 13th–10th centuries cal bc and continued into the Roman era. The chronostratigraphies preserved in the banks testify to a sustainable agricultural regime of unprecedented time-depth: centuries of continued use make the system employing raatakkers the most enduring and stable form of farming known in the history of the Netherlands.