Idaho's third-largest city continues rapid growth across the Treasure Valley west of Boise, where population has doubled since 2000 to exceed 100,000. High desert climate creates hot, dry summers with temperatures reaching the mid-90s and cold winters averaging 30°F. The valley's 2,500-foot elevation sits between the Boise Mountains to the north and Owyhee Mountains to the south. Minimal annual rainfall of 12 inches means irrigation sustains agriculture and landscaping. Spring brings strong winds across the flat valley floor, while fall temperatures drop quickly after September. Nampa's sprawling development patterns reflect rapid suburban expansion.
