Registration closed April 30, 2016 11:59 PM at 2016-04-30T20:59:00-0700 Registration ends April 30, 2016 11:59 PM at 2016-04-30T20:59:00-0700 Registration opens February 1, 2016 1:00 AM at 2016-01-31T22:00:00-0800 Registration runs from February 1, 2016 1:00 AM to April 30, 2016 11:59 PM
If it's before April 1, you need to be a current MCO member. To renew or become a members, please see this page to get started.
For complete details on the 2016 Autocross Number Reservation Rules, see here.