SpongeBob SquarePants first aired as a sneak‑peek preview on May 1, 1999, and then officially premiered on Nickelodeon on July 17, 1999.

Quick Scoop: Key Dates

  • Sneak‑peek premiere (pilot “Help Wanted” block): May 1, 1999, right after the 1999 Kids’ Choice Awards.
  • Official series premiere on Nickelodeon: July 17, 1999.
  • Country listing shows the U.S. release dated May 1, 1999 for the first airing.

So if you’re answering “when did SpongeBob come out,” people usually mean either:

  • The first time it ever aired → May 1, 1999.
  • The official series launch date → July 17, 1999.

Many fan discussions now mark 2024–2025 as the 25th‑anniversary era of SpongeBob’s debut, since the first airing was in 1999.

Mini TL;DR

  • First TV appearance: May 1, 1999.
  • Official Nickelodeon premiere: July 17, 1999.

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