Ian Ziering first tried to sell a 'loosely scripted' reunion special in which the original cast played themselves at a dinner party, targeting an airdate of September 2, 2010 to mark the original show's numerical title, but he could not find an interested network.

The series originated from a March 2018 meeting between Tori Spelling and CBS Television Studios president David Stapf, after which Spelling and Jennie Garth partnered with the studio to develop a project featuring 'exaggerated versions of themselves.'

Fox's short six-episode order reflected a shift away from traditional 22-episode seasons following Disney's acquisition of 20th Television, which left Fox as a stand-alone network; the series was originally titled '90210' before being renamed BH90210 in April 2019.

Luke Perry was set to return for as many episodes as his Riverdale schedule allowed, but he died on March 4, 2019 after suffering a stroke before officially signing on, though he had been creatively involved beforehand; the first episode used archive footage of him and was dedicated to his memory.

Shannen Doherty had not originally intended to join the show, but decided to participate after Luke Perry's death as a way to honor him.

Natalie Sharp, cast as the new character Anna, dyed her hair red for the role and began filming the very next day after being cast.

Ivan Sergei, cast as Tori's fictional husband Nate, had previously co-starred with Tori Spelling in the 1996 TV film Mother, May I Sleep With Danger?

On set, the actors' fictionalized characters were referred to by their initials to avoid confusion since the actors were essentially speaking about themselves in the third person.

Because of the show-within-a-show premise, real production facilities appeared on camera, including the actual makeup artists and trailers used to get the cast ready for filming.

Filming took place in Vancouver from May 21 to July 31, 2019, with scripts still being written concurrently with shooting, and scenes at the fictional West Beverly Hills High School were shot at Vancouver Technical Secondary School.

Jason Priestley's character was written as 'Christopher Nolan-obsessed,' and Priestley wore a 'WWCND' ('What Would Christopher Nolan Do?') bracelet while filming.

The writers looked to shows like Curb Your Enthusiasm and Episodes as models for actors playing fictionalized versions of themselves, though showrunner Mike Chessler considered BH90210 more challenging since it involved an entire ensemble rather than a single actor.

From August 1 to August 3, 2019, Fox and PopSugar opened a Peach Pit-themed pop-up restaurant in Los Angeles modeled after the diner from the original series, which was extended through the end of September due to high demand.

The official trailer, released May 13, 2019 at the Fox upfronts, amassed 18 million views and over 140,000 shares in under 69 hours, making it the most-watched and most-shared trailer among all new series for the 2019-20 broadcast season.