DELTARUNE Chapter 1 was released on October 31, 2018 for PC (Windows), with ports to Nintendo Switch and PlayStation 4 following on February 28, 2019.

Quick Scoop: Release Timeline

  • PC (Windows): October 31, 2018.
  • Nintendo Switch: February 28, 2019.
  • PlayStation 4: February 28, 2019.

Fans often remember it as a surprise Halloween drop: the game appeared as a mysterious download that turned out to be the entire first chapter of DELTARUNE.

TL;DR: When did DELTARUNE Chapter 1 release?
Halloween 2018 on PC (October 31, 2018), then February 28, 2019 on Switch and PS4.

Information gathered from public forums or data available on the internet and portrayed here.