There are no seasons of Steel Magnolias because it is a film, not a TV series. The 1989 title is listed as a movie, while the Netflix result in the search is for Sweet Magnolias , which is a separate series with multiple seasons.

Clarification

  • Steel Magnolias = one movie, no seasons.
  • Sweet Magnolias = the Netflix series; as of the retrieved sources, it has five seasons.

Quick answer

If you meant Steel Magnolias , the answer is 0 seasons. If you meant Sweet Magnolias , the answer is 5 seasons.

TL;DR: Steel Magnolias is a movie; Sweet Magnolias is the series with five seasons.