Monarch Migration 2024 Ohio Map. Staff review maps for accuracy and may move observations to a more appropriate map. Only a few monarchs remain in the monarch butterfly biosphere reserve in mexico.
The report that follows is a rough attempt to assess the prospects that the monarch population will recover from the historically low number of hectares recorded for all the overwintering sites last winter (0.9ha). Monarchs from overwintering populations are nearing the end and their offspring are beginning to advance into summer breeding territories.