As per this thread, the next Parkour class @ Hart's Gymnastics will be on Saturday, December 12. The pertinent info is below, as well as in the forum thread.

Price: $17
Location: Hart's Gymnastics
4520 B St NW Suite C
Auburn, WA 98001
253.520.1973
http://hartsgymnastics.com/
Time: 5p to 7p

While this has been true for the month of November, I'd like to reiterate it here on the front page. In addition to the regular classes at Parkour Visions' Seattle Parkour Gym, there are open gym times from 7p to 9p on Monday nights and 5p to 8p on Friday and Saturday nights. The forum thread for that is here.

And the Tacoma classes being held at Crossfit Tacoma are still going strong 3 times a week. The schedule can be found at Parkour Visions or Crossfit Tacoma.