During 1994, in Cuapiaxtla Valley, in Taxcala, Mexico, a region with frequent freezing injury to crops, the association of maize and common beans was evaluated to find out the potential of the maize plant cover in reducing damage on bean plants by freezing temperatures. A chilling wave 126 days after planting caused the death of maize plants, while the bean plants completed their biological cycle and produced 350 kg/ha.