when to remove conditions on cr1 visa?

Your husband would have to file an I-751 petition to remove the conditional basis of his residence status within the 90 days prior to the second anniversary of his grant of conditional residence. As his conditional residence expires on 12/25/14, he could submit his I-751 at any time from 9/26/14 to that date.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.  

The earliest you can apply is September 25, 2014--90 days before it expires.