Predation risk has long been known to exert a strong influence on behavior, but no study to date has determined whether predators influence offspring antipredator behavior via maternal effects. Here, we provide a unique example of a transgenerational maternal effect in antipredator behavior that takes the form of a “warning” about predators that female fall field cricketsGryllus pennsylvanicustransmit to their offspring. Specifically, the offspring of gravid crickets exposed to a wolf spiderHogna helluoexhibit greater antipredator immobility in response toHognachemical cues than do offspring of nonexposed females. These “forewarned” crickets exhibit greater survival in the presence ofHognathan do those not forewarned. Accordingly, gravid crickets from areas with significantHognapopulations produce offspring that are more responsive toHognacues than do those from nearbyHogna‐free areas. Such transgenerational maternal effects may be more common than currently realized.