User blog comment:Anomalous13/Bloons Wiki News - April 13, 2012/@comment-4991759-20120521055942/@comment-5138152-20120521071906

Polls are added twice per month. The first poll starts on the 1st of each month and ends on the 15th of the respective month. The second poll starts on the 15th of each month and ends on the 30th/31st of the same month.