Yes, Buckle credit card rewards or B-Rewards expire. You will lose all the rewards you earned every three months if you fail to earn at least 300 points. In case you managed to earn required 300 points, you will receive $10 worth certificate to spend on Buckle purchases. All the remaining rewards (in case they are not enough for another $10 certificate) will expire. If you need a credit card with rewards and do not want them to expire, consider applying to the general rewards credit card.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.