Recurring drought conditions place forage production challenges on farmers and ranchers. Each year they are faced with fall and winter forage grazing shortages, and higher demand for costly stored feeds. The objectives were to: 1) determine forage yield in a double-crop situation 2) simulate timing of taking a first crop of alfalfa then rotating to an annual forage. Forty-four annual forage crop cultivars included cool-season forages, (cereals and legumes); forage brassicas (canola or rape), kale, turnips and Swedes along with warm-season forages, corn, sorghum, and sorghum x Sudan grass hybrids. Plots were planted in 4 replications in a randomized complete block design during 10-11 July 2003 and 6-8 July 2004 near Kimberly, Idaho (42°30' N 116°30' W, 860 to 1300 m elevation). Growing season was 67 days in 2003 and 77 days in 2004. Corn and sorghum hybrids dry matter yielded 15 to 28 Mg ha-1 (7 to 12.5 tons/acre) in 2003, but only 3.8 to 10.3 Mg ha-1 (1.7 to 4.6 tons/acre) in 2004. The summer of 2003 had record high temperatures while the summer of 2004 was near record cool temperatures. Yield in 2003 generally ranked sorghum hybrids  corn > grazing corn > spring cereals > brassicas  winter cereals = legumes. Yield in 2004 was mixed for crop type, however, brassicas generally yielded the best in the cool conditions. The key conclusions are that warm season forages will yield more than cool season forages when planted in mid summer, and corns, sorghums, and Sudan hybrids will cease growth with the first frost. Cool season forages continue to grow after the first frost in the fall and will grow again in early spring.