Initial germination, Germination at 20oC, First Count, Tetrazolium1-3, Tetrazolium 1-3, and several temperature-time combinations of Accelerated Aging were evaluated as measures of storability on 20 mechanically-delinted cottonseed lots, treated and non-treated with fungicide, and stored under open storage conditions at Campinas, SP. The effectiveness of the several tests was evaluated by simple correlation and regression with germination responses of the seed lots during a storage period of 18 months. In non-treated seeds, Germination at 20oC was the most efficient test for predicting the storability, the combinations of Accelerated Aging were not very effective. In treated seeds, Accelerated Aging at 42oC for 72 hours was the most reliable test. Overall, the germination values predicted for the several storage periods were very dose to the observed values there having been an index of prediction failures of only 7.5%.