Tough Mudder just opened First Week Registration for the 2013 Southern California Tough Mudder.
Through Friday, August 10, there is also a $10 discount off first week registration prices using Promo Code "MudderAug2013" Prices go up significantly after that.
I have registered for the 8AM first wave because the course will be clean and the air should be cool. This event will probably be inland and it will heat up as the day goes on.
Here is the link to register: http://toughmudder.com/events/california-socal-2-sat-jun-22-sun-jun-23-2013/