Season 3 (The Loud House)

On October 19, 2016, The Loud House was renewed for a third season by Nickelodeon and will consist of 26 half-hours, it will premiere in Fall 2017 or early 2018.

​Background
On Yahoo.com:

Chris Savino has created a very engaging and relatable world through the animated series ‘The Loud House,’ which is a proven hit with our audience, said James Stephenson, senior vice president, animation and games, at Nickelodeon. The season three order is a demonstration of Nickelodeon’s continued commitment to bringing fresh stories to our viewers, it will then be a thing to love between Lincoln Loud and his 10 sisters.

Trivia

 * According to Chris Savino, Lincoln won't be appearing in a few episodes of Season 3.
 * Luna's crush, Sam, will return this season.
 * Like Season 2, there will be three or four half-hour specials, including a "Rock opera", and a "Halloween" special.