New York Real Property Tax Law Section 301 - Valuation date.

  301.  Valuation  date.  All  real property subject to taxation, and
  assessed as of a March first taxable status date, shall be valued as  of
  the  preceding first day of July. The valuation date of real property in
  a city or town not subject to the provisions of this  section  shall  be
  determined  as  of  the  date provided by law applicable to such city or
  town, or if not so provided, then as of the taxable status date  of  the
  city  or  town.  The  valuation date of the real property entered on any
  assessment roll shall be imprinted or otherwise indicated at the top  of
  the first page of each volume of such roll.

Last modified: February 3, 2019