SciencePrehistoricgloballow confidence

The Younger Dryas cold period began about 12,900 years ago and lasted approximately 1,000 years.

Notes on verification

Start date (~12,900 years ago) is consistently confirmed across multiple sources. Duration is slightly understated compared to most commonly cited figures (1,200-1,300 years), but 'approximately 1,000 years' remains a reasonable approximation.

Sources