The episode was met with positive reviews from critics and fans. Although not all television critics reacted positively to Andy's dancing injury sub-plot, "Niagara" has nonetheless come to be considered a classic episode of the series. In a poll conducted by OfficeTally at the end of season six, the episode was named the second best episode of the series after the second-season finale, "Casino Night." The episode was viewed by 9.42 million households with a 4.8 rating/12% share in the 18–49 demographic making it the second highest viewed episode of the season after "The Delivery."
