<p>Unfortunately, the <a href="https://stats.stackexchange.com/help/bounty">answer is <strong>no</strong></a>. You must assign the bounty during the bounty + grace period; otherwise it vanishes. If you don't award a bounty and there is an answer with the highest score (minimum 2 upvotes) gets half of the bounty. Bounties cannot be canceled, prolonged, etc.</p>
