A 2-yr pitfall-trap study was conducted to examine the species composition of the Opiliones and the seasonal age-structure of Phalangium opilio (L.) in central Kentucky soybean, grassland, and alfalfa habitats. Phalangium opilio was the most commonly caught opilionid in all habitats, accounting for >90% of the adult specimens captured in soybean and alfalfa. Pitfall-trap results also suggest that Kentucky P. opilio populations have three generations per year and overwinter in the egg stage. Absolute sampling indicated that P. opilio was present at densities of <0.5 per m2 in soybean.