Seasons cannot be deleted by users or administrators. The inability to do so is primarily a precaution set in place to prevent the accidental loss of data, as all data associated with that season will be lost.Seasons can be hidden from view by navigating to Setup->Organization->League in the admin panel, then clicking "Season Editor".

Choose the season that you would like to hide, then check the box labeled "Hide Season", and click "UPDATE".

If it is imperative that your season be deleted, please email websupport@manageyourleague.com and request that the support team delete a season for you.