Lambs can be marketed at any age and often vary in weight from 20 to 160 pounds depending on the time of year and market conditions. Although the vast majority of ewes lamb in the spring, lambs can be born from September through May.These lambs are usually sold at around 110 pounds and are marketed through local auctions, slaughterhouses, brokers, and individuals. In recent years, direct markets, niche markets, and cooperatives have become popular for selling lambs.