A. DRIVER ELIGIBILITY: The event is open to all drivers with a valid state driver's license and a full membership to the SCCA. If you don't have a membership you can join when you register.

B. TIME TRIALS LICENSES: It will help if you have one, but it's OK if you don't. Event officials will work with you to make sure you get one fitting your experience level at the event. (No charge.)

C. MEDICAL: Please notify the Officials of any pertinent medical condition(s). Any participants involved in an accident in which there is significant damage or any injury, or at a race official’s discretion, MUST present themselves or be transported to the track medical facility for evaluation. Off-site medical transportation fees may apply.

D. MINOR DRIVERS: Drivers 16- and 17-years-old, with a state-issued driver's license can compete, but there is some extra paperwork. Please contact Officials before the event and get approval from the Event Lead.

A. VEHICLE ELIGIBILITY: Competition is open to all vehicles conforming to the National Time Trials Classes. Some tracks do not allow Electric Vehicles. Please refer to Track Information to verify EV eligibility.

B. DECALS: All cars must have Tire Rack SCCA Time Attack Challenge decals and any required partner decals visibly placed on each side of the vehicle and a Tire Rack windshield banner at the top of the front windshield. Decals will be provided free of charge and may be obtained at registration and/or tech. A diagram of sticker placement for Time Attack Challenge events can be found here: Time Attack Challenge Decal Placement. A diagram of sticker placement for Time Trials Nationals will be available soon.

C. TECHNICAL INSPECTION: All vehicles must be presented at tech to turn in tech forms and pass the event safety inspection (Tech) if required prior to any on-course participation. Tech may also check event sponsor decal requirements and verify compliance of Vehicle Identification. Competitors are cautioned that vehicle/identification color combinations such as red/black, red/blue, and white/silver do not have adequate contrast.

D. TIMING & SCORING: All cars are required to use fully operational Westhold, MyLaps/AMB TranX260 or X2 transponders. The driver is responsible for providing correct information to Timing & Scoring. Non-functioning transponders will likely result in the loss of times.

E. RENTAL TRANSPONDERS: Rental transponders are available through registration.

A. GENERAL RULES: This event is governed by the 2026 SCCA Time Trial Rules (TTR), National Competition Format and National Classing as outlined at timetrials.scca.com plus the rules and procedures found on this page.

B. PASSING & TRACK PROCEDURES: Groups will use the suggested passing rules and procedures for Novice, Intermediate and Advanced Drivers as outlined in the “Rules of The Track” section found at timetrials.scca.com.

C. CLOTHING: Drivers are required to wear the minimum clothing outlined in the SCCA Time Trials Rules or as required in the specific track rules for their car and class. Safe apparel must be worn in the pits at all times (shirts and closed toe shoes). Crew members on pit lane must display their event credentials at all times while on pit lane.

D. PACED LAPS: Paced Laps are intended for Novice Drivers and Drivers who have never seen the track. Other drivers may join with permission of their group's driver coach if they join at the back and track density permits.

E. PIT LANE: The speed limit on pit road is 25 mph. No tire scrubbing in the pit lane prior to entering the course.

F. IMPOUND: Drivers will report to impound for post-session debriefs immediately following each session.

G. RESULTS: Live timing will be available during the event at timetrials.scca.com. Provisional and final results will be posted at the Event Center. Additionally, final results will be posted to timetrials.scca.com no later than seven days following the completion of the event.

H. FLAG PROCEDURES: Black Flag Station and other event-specific flagging procedures will be announced at the event.

I. SCALES: Location and Requirements will be available at check-in.

J. EVENT SCHEDULE: Actual session start times may be delayed from the published schedule due to unforeseen circumstances during the event. It is the driver’s responsibility to listen to the PA system and pay attention to activity on track. The schedule or run groups may only be changed (or start times advanced) at the discretion of the Competition Director, with concurrence by the Event Lead, depending on pre-race entry counts or as needed to accommodate situations during the event.

K. COMMUNICATIONS: Radio frequencies used by event officials may be monitored but shall not be used for communication by any participant.

Tire Rack SCCA Time Attack Series Challenge at Buttonwillow Raceway 

Event Schedule

November 14th and 15th, 2026

Friday, Nov 13th

Saturday, Nov 14th

Sunday August 23rd

A. PAYMENTS, WITHDRAWALS & REFUNDS: Credit card payment is required for online registration. A full refund will be given for cancellations made 2 weeks before the event start date. A $150 cancellation fee will be charged for cancellations made within 2 weeks of event start date. Any withdrawal or cancellation of your registration should go through my.scca.com by going to "My Events", finding your event, and clicking "cancel" to submit a cancellation request. If you have any additional questions, please reach out to the Time Trials team at timetrials@scca.com.