Most visitors don't need a visa, but which rule applies depends on your passport, and one date matters for a winter trip. Ordinary-passport holders from 50 countries, among them the United Kingdom, Germany, France, Italy, Spain, Russia, Canada, Australia, New Zealand, Japan, South Korea, Brazil and Argentina, can enter visa-free for up to 30 days. For most of them the exemption currently runs to 31 December 2026. A January or February 2027 trip falls after that, so check the NIA list for an extension before you book, or see whether the transit rule below suits you. The United States is not on the 30-day list.
Citizens of 57 countries, the United States among them, can use the 240-hour (10-day) visa-free transit instead, with an ordinary passport and a confirmed onward ticket to a third country or region (not China, and not the place you flew in from). It covers Harbin city only, not Snow Town, and local reports name Harbin Taiping Airport as the only Heilongjiang port using it. Other nationalities need a visa; start at the NIA site, and fill in the free online arrival card before you land.