In 2008, CBS canceled development on a drama called Brother Grimm, from Stephen Carpenter and production companies CBS Paramount Television and Hazy Mills Productions, because of the writers' strike.

In January 2011, NBC announced that it had ordered a series titled Grimm.
David Greenwalt and Jim Kouf cowrote the pilot, which was directed by Marc Buckland.
Filming for the pilot began in March in Portland, Oregon.
 In May 2011, NBC announced that it had picked up the series.

Greenwalt and Kouf served as executive producers for the series, along with Sean Hayes and Todd Milliner.
The series was produced by Universal Media Studios and Hazy Mills Productions.
It was filmed on location in and around Portland.
Greenwalt and Kouf told Portland's NBC affiliate KGW they chose Portland because of its plentiful forests in the city's two largest parks, Washington Park and Forest Park.

On September 30, 2011, NBC delayed the debut of Grimm by one month, moving the premiere to October 28, 2011, so it could premiere closer to Halloween.
On November 21, 2011, NBC picked up the series for a full 22-episode season.
NBC showed a special Thursday showing on December 8 at 10 pm to see if the network's overall ratings could improve.

On March 16, 2012, NBC announced that the series had been renewed for a second season; according to writers/producers David Greenwalt and Jim Kouf, they would continue to film the show in Portland, saying, "Rain or shine, Portland has been the ideal setting for fairy tales with its enchanting layout.
It is its own character in our show with the perfect mix of urban and rural settings."
Grimm ran on Fridays for the entirety of its first season.
The second season premiered on Monday, August 13, 2012, and continued on Mondays for four episodes, before returning to its original Friday timeslot on September 10.

On April 19, 2013, NBC announced they would move Grimm to Tuesdays beginning on April 30, 2013 for the remainder of Season 2 until May 21.
Grimm was renewed for a third season on April 26, 2013.
The third-season premiere on October 25, 2013 returned the show to its original Friday timeslot.
On March 19, 2014, NBC announced that Grimm had been renewed for a fourth season, which premiered on Friday, October 24, 2014.

On February 5, 2015, NBC confirmed a fifth season for Grimm, which premiered on Friday, October 30, 2015.

On April 23, 2016, NBC confirmed at least 13 episodes for a sixth season.
In 2008, CBS canceled development on a drama called Brother Grimm, from Stephen Carpenter and production companies CBS Paramount Television and Hazy Mills Productions, because of the writers' strike.
In January 2011, NBC announced that it had ordered a series titled Grimm. David Greenwalt and Jim Kouf cowrote the pilot, which was directed by Marc Buckland. Filming for the pilot began in March in Portland, Oregon.  In May 2011, NBC announced that it had picked up the series.
Greenwalt and Kouf served as executive producers for the series, along with Sean Hayes and Todd Milliner. The series was produced by Universal Media Studios and Hazy Mills Productions. It was filmed on location in and around Portland. Greenwalt and Kouf told Portland's NBC affiliate KGW they chose Portland because of its plentiful forests in the city's two largest parks, Washington Park and Forest Park.
On September 30, 2011, NBC delayed the debut of Grimm by one month, moving the premiere to October 28, 2011, so it could premiere closer to Halloween. On November 21, 2011, NBC picked up the series for a full 22-episode season. NBC showed a special Thursday showing on December 8 at 10 pm to see if the network's overall ratings could improve.
On March 16, 2012, NBC announced that the series had been renewed for a second season; according to writers/producers David Greenwalt and Jim Kouf, they would continue to film the show in Portland, saying, "Rain or shine, Portland has been the ideal setting for fairy tales with its enchanting layout. It is its own character in our show with the perfect mix of urban and rural settings." Grimm ran on Fridays for the entirety of its first season. The second season premiered on Monday, August 13, 2012, and continued on Mondays for four episodes, before returning to its original Friday timeslot on September 10.
On April 19, 2013, NBC announced they would move Grimm to Tuesdays beginning on April 30, 2013 for the remainder of Season 2 until May 21. Grimm was renewed for a third season on April 26, 2013. The third-season premiere on October 25, 2013 returned the show to its original Friday timeslot. On March 19, 2014, NBC announced that Grimm had been renewed for a fourth season, which premiered on Friday, October 24, 2014.
On February 5, 2015, NBC confirmed a fifth season for Grimm, which premiered on Friday, October 30, 2015.
On April 23, 2016, NBC confirmed at least 13 episodes for a sixth season.
Grimm (TV series)