When does 'Hard Knocks' start? 2021 premiere date, trailer for HBO's Cowboys series Unknown 06:46 Everything you need to know about the release date for the upcoming season of "Hard Knocks." Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsChelsea join Manchester City and Liverpool at Premier League summitPro Kabaddi League 2018: Tamil Thalaivas thrash Patna Pirates 42-26 in openerMoin Khan backs Pakistan for World Cup gloryPro Kabaddi League 2018: Puneri Paltan hold U Mumba to a thrilling tieISL 2018: Jamshedpur FC hold Bengaluru FC to 2-2 drawLacazette, Ramsey star as rampant Arsenal make it nine in a row
