Neb. Rev. Stat. § 77-204: Real estate taxes; when delinquent.

One-half of the taxes due under section 77-203 shall become delinquent on May 1 and the second half on September 1 next following the date the taxes become due, except that in counties having a population of more than one hundred thousand, the first half shall become delinquent April 1 and the second half August 1 next following the date the taxes become due.