N.D. Cent. Code § 57-20-26
Between the first and fifteenth of November of each year, the county treasurer shall mail to each owner of any lot or tract of land for which taxes are delinquent a notice giving the legal description of that lot or tract and stating that the taxes are delinquent and constitute a lien against the property. The notice must advise the owner that unless the delinquent taxes and special assessments with penalty, simple interest at the rate of twelve percent per annum from and after January first following the year in which the taxes become due and payable, and costs established under subsection 5 of section 57-28-04 are paid by October first of the second year following the year in which the taxes became delinquent, the county auditor will foreclose on the tax lien and issue a tax deed to the county.
N.D.C.C. § 57-20-26