The 1st New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from September 9, 1777, to June 30, 1778, during the first year of George Clinton's governorship, first at Kingston and later at Poughkeepsie.

The 4th Provincial Congress of the Colony of New York convened at White Plains on July 9, 1776, and declared the independence of the State of New York. The next day the delegates re-convened as the "Convention of Representatives of the State of New-York" and on August 1 a committee was appointed to prepare a State Constitution. The New York Constitution was adopted by the Convention on April 20, 1777, and went into force immediately, without ratification by popular vote.

The State Senators were elected on general tickets in the senatorial districts, and were then divided into four classes. Six senators each drew lots for a term of 1, 2, 3 or 4 years and, beginning at the following election in April 1778, every year one fourth of the State Senate seats came up for election to a four-year term.

Assemblymen were elected countywide on general tickets to a one-year term, the whole assembly being renewed annually.

On May 8, 1777, the Constitutional Convention appointed the senators from the Southern District, and the assemblymen from Kings, New York, Queens, Richmond and Suffolk counties—the area which was under British control—and determined that these appointees serve in the Legislature until elections could be held in those areas, presumably after the end of the American Revolutionary War. Vacancies among the appointed members in the Senate should be filled by the Assembly, and vacancies in the Assembly by the Senate.

The State Legislature met in Kingston, the seat of Ulster County. The State Senate met first on September 9, 1777, at the home of Abraham Van Gaasbeck, now known as Senate House, the Assembly met first on the next day at the Bogardus Tavern. At the approach of the British army, the State Legislature dispersed on October 7, and reconvened in Poughkeepsie on January 5, 1778, possibly at a house now known as Clinton House.

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