The race usually fills up by August - the mtn. bike race filled up in 15 minutes, so who knows! There is a 600 runner limit.
This will be my third year doing the race. From their website, "About 2/3 of the 50 Mile course is on trails or jeep (unimproved) roads. 30% is on smooth, rolling gravel roads and 3% is on pavement. It is a challenging course, with 8,900' of vertical, good footing/traction." Noting too technical like Bear Mountain or MoMa.
The weather is iffy at that time of year, as it rained almost the entire time in 2012. The event is really well organized with great energy and well-stocked aid stations. Beautiful scenery and a course that is spectator-friendly.
Tommy, it's a large loop. The speedy guys finish a little over 6 hours. I think Mike Dixon held the course record at one point. Much easier on the feet than Bear Mtn., but the hills can take a toll on the legs.