The first datings of the artifacts using the thermoluminescence technique resulted in a range from 4420 BCE to 3400 BCE, which would have made the site the earliest Bronze Age culture in the world. However, with the 1974-1975 excavation, sufficient material became available for radiocarbon dating, which resulted in more recent dates. The earliest grave was about 2100 BCE, the latest about 200 CE. Bronze making began circa 2000 BCE, as evidenced by crucibles and bronze fragments.[3] Bronze objects include bracelets, rings, anklets, wires and rods, spearheads, axes and adzes, hooks, blades, and little bells.
The date of 2100 BCE was obtained by Joyce White on the basis of six AMS radiocarbon dating crushed potsherds containing rice chaff temper and one on the basis of rice phytoliths. The potsherds came from mortuary offerings. This method of dating is now known to be unreliable, because the clay from which the pots were made might well itself contain old carbon. Specialists in radiocarbon dating now discourage use of this dating method. A new dating initiative for this site has been undertaken by Professor Thomas Higham of the AMS Dating Laboratory at Oxford University, in conjunction with Professor Charles Higham of the University of Otago. This has involved dating the bones from the people who lived at Ban Chiang and the bones of animals interred with them. The resulting determinations have been analysed using the Bayesian statistic OxCal 4.0, and the results reveal that the initial settlement of Ban Chiang took place by Neolithic rice farmers in about 1500 BCE, with the transition to the Bronze Age about 1000 BCE. These dates are a mirror image of the results from the 76 determinations obtained from a second and much richer Bronze Age site at Ban Non Wat. The mortuary offerings placed with the dead at Ban Chiang during the Neolithic and Bronze Ages were in fact, few and poor.