Kura clover (Trifolium ambiguum M. Bieb) is an underutilized forage legume with great potential as a durable forage legume in permanent pastures and in living mulch management systems. A major impediment to the widespread use of kura clover is establishment difficulty. Several studies have examined practices for establishing kura clover in pure stands, with companion crops, with pasture grasses, or seeded into existing pastures. The objective of this research was to determine optimal seeding rates for mixtures of kura clover grown with a grass species and a fast‐establishing forage legume. The goal was to produce pastures with the greatest and most consistent forage legume content during the lifespan of the pasture. Varying seed ratios of kura clover/red clover (T. pratense L.) or kura clover/birdsfoot trefoil (Lotus corniculatus L.) were used in combination with orchardgrass (Dactylis glomerata L.), reed canarygrass (Phalaris arundinacea L.), and tall fescue (Festuca arundinacea Schreb.). In kura clover/birdsfoot trefoil mixtures with a grass companion, optimal seeding ratios by weight between forage legumes were 75:25 and 50:50 kura clover/birdsfoot trefoil. In kura clover/red clover mixtures with a grass companion, the optimal seeding ratios between forage legumes were 75:25 kura clover/red clover. Mixtures containing kura clover and red clover had the greatest percentage forage legume dry matter (above 50%). This study demonstrates that pasture forage legume content can be increased by seeding with binary mixture of kura clover and a fast‐establishing forage legume.