N.H. Rev. Stat. Ann. § 169-C:8
I. After a petition has been filed or an ex parte order issued, the court shall issue a summons to all persons named in the petition to be served by a law enforcement officer personally, or if personal service is not possible, at their usual place of abode. Such summons shall require the person or persons having custody or control of the child to appear personally, unless otherwise ordered, before the court at a time and place set for a preliminary hearing, which shall not be less than 24 hours nor more than 7 days after return of service of the petition.
I-a. If the location of the parent or parents is unknown as set forth in an affidavit filed with the court in which the petitioner describes its efforts to locate the parent or parents, the court may, upon request of the petitioner, order the petitioner to provide notice by publication once a week for 2 successive weeks in a newspaper of general circulation where that person was last domiciled or by certified mail at the last known address. Notwithstanding the time limits in paragraph I, if service by publication is ordered, the preliminary hearing should not be later than 40 days from the date the petition is filed and no sooner than 7 days from the last date of publication. The need for service by publication shall constitute extraordinary circumstances to extend the time for an adjudicatory hearing, pursuant to RSA 169-C:15, III(d).
Source. 1979, 361:2. 1983, 458:8. 1990, 140:2, X. 1991, 214:1. 1994, 411:7. 1995, 308:65. 2007, 236:10. 2008, 274:31, eff. July 1, 2008. 2020, 26:20, eff. July 1, 2020. 2022, 272:13, eff. Jan. 1, 2023.