Starwood used to do straight status matches from number of programs like Marriott or Hilton. This was all changed in early 2011. From April 1st, 2011 Starwood initiated a Platinum challenge where spending 15 nights during 90 day period would earn you a Platinum status. This was further changed to 18 nights during three calendar month period back in November 2012.
Here are the current requirements for SPG Platinum challenge
1. No previous Platinum status with Starwood Preferred Guest
2. 18 nights during three calendar month period (need to be paid nights – award/cash & points nights do not count)
You can choose any consecutive three months. If you have already had number of Starwood stays in February and March, you can sign up, and now choose February to April to be your three consecutive months. You can also change the three month period after you have chosen it. If you fail the challenge, you can do another one.
By completing the challenge after March 1st, 2012 you will receive the Platinum status all the way until February 2014.
There is no need to have status with competing program to start the challenge.
You can start the challenge and receive further information about this program by emailing SPG at firstname.lastname@example.org.