N.Y. Comp. Codes R. & Regs. tit. 18, § 393.3
(a) For purposes of the annual HEAP State Plan, the office will designate a specific period of time during which local districts must receive applications for HEAP benefits. If the office determines that sufficient program and administrative funds are available, the office may extend the period for receiving applications for HEAP benefits beyond the last business day of the specified time period. In the event that the office determines that there are insufficient program and/or administrative funds to continue receiving applications prior to the last business day of the specified time period, the time period for receipt of applications may be correspondingly shortened. Applications for emergency HEAP benefits will be accepted at least until March 15th of each program year. Applications for HEAP benefits must be received and recorded on the State-prescribed form or on a local equivalent form approved by the office. During the designated period of time that local districts receive applications, social services districts must: