2026 Tire Rack SCCA Time Attack Challenge at Thunderhill Raceway Park

May 30, 2026 to May 31, 2026
May30

    Northern California motorsports fans, get ready—the Tire Rack SCCA® Time Attack Challenge Series is heading west with a can’t-miss weekend at Thunderhill Raceway Park in Willows, CA, running alongside Global Time Attack for a full-on festival of speed.

    This action-packed event takes place across two iconic configurations of Thunderhill. Saturday unleashes the West Course, where technical sections and rhythm reward precision and confidence. Sunday turns things up on the East Course, known for its flowing corners, high-commitment zones, and opportunities to stretch the car’s legs. Two days, two distinct challenges, one legendary venue.

    Looking to measure yourself against the best? Thunderhill has been the proving ground for countless fast laps and memorable battles. With National Time Trial competitors, Global Time Attack entries, and a stacked weekend schedule, there’s no shortage of benchmarks to chase—and plenty of opportunity to set new ones. Whether you’re hunting a Personal Best or aiming to etch your name into the record books, Thunderhill delivers the perfect stage.

    But the action doesn’t stop with Time Attack. Saturday and Sunday features drifting and additional racing action keep the energy high all weekend long. From sunrise warm-ups to sunset celebrations, there’s always something happening on track or in the paddock.

    When the driving wraps up, Thunderhill’s classic paddock atmosphere takes over. Camp out, bench race with friends, relive your fastest laps (and near-misses), and soak in the camaraderie that only a multi-discipline race weekend can deliver.

    Ready to take on Thunderhill—West Course Saturday, East Course Sunday—and be part of a motorsports spectacle with Global Time Attack? Register now and join us for a weekend where speed, skill, and community collide at one of America’s premier road courses.

    FAST FACTS

    ON-TRACK

    • Event takes place at Thunderhill Raceway, and will run both West and East courses!
    • Each driver gets one practice and three competition sessions for each track variation.
    • Results will be based by combining each driver's fastest lap on each day. The podium highlights the three lowest combined times per class.
    • Drivers will be grouped by their experience level, and gridded by lap times following the practice session.

    Registration opens February 25th at 3pm CST! Cap is set at 55, so sign up early to get that sweet early bird deal!!

    Time Attack Entry Fee: $450

    Early Bird Entry Fee: $375 - Ends March 6th!

    EVENT RULES

    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.

    DRIVER ELIGIBILITY & INFORMATION

    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.

    VEHICLE ELIGIBILITY & INFORMATION

    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.

    THUNDERHILL EVENT OFFICIALS
    Event Lead John Hunter
    Competition Director Kris Wilcox
    Driver Coaches TBA
    THUNDERHILL TRACK INFO
    THUNDERHILL TRACK INFO

    General Info

    1. Thunderhill has a DB limit of 103 for all vehicles and mufflers are required.
    2. Entrance to the paddock to drop off vehicles and trailers or for early arrival when camping has been previously arranged is 5:30 pm.
    3. Paddock speed limit is 10mph or less.
    4. Keep fire lanes open at all times.
    5. Unauthorized vehicles including ATV’s, golf carts, motorized bikes, scooters, or skateboards are NOT allowed on the racetrack at Thunderhill Park. No one under 16 allowed on any ATV, golf cart, motorized bike, or scooter.
    6. People may walk or ride a bicycle on the track after hours with permission from Thunderhill Raceway Park management.
    7. Recycle Bins Are available in the paddock area; please use them appropriately.
    8. Please do not throw trash on the ground. There are trash cans throughout the paddock.
    9. Illegal drugs, explosives, guns, bows and arrows, sling shots, and similar devices are prohibited. Anyone found with these items will be asked to leave the property.
    10. NO FIREWORKS ALLOWED!
    11. Pets allowed into the track must be on a leash at all times. Please clean up after your pet. Pet access is a privilege not a right. The track reserves the right to deny pet access to the property at any time.
    12. No open campfires or barrel fires are allowed. Only contained, manufactured barbeques and grills are permitted.
    13. No race engines can be run before 7:30 am or after 6:00 pm Quiet time is from 10pm – 7:30am. Please be courteous to your neighbors by not playing loud music or making loud noises between these hours.
    14. No waste water dumping is allowed. There are RV dump areas a few miles from track. Please see Thunderhill Park Management for directions.
    15. Offensive signs, public drunkenness and loud profanity will not be tolerated.
    16. The selling of unauthorized merchandise is not permitted.
    17. Please do not overload the electrical hookups with excessive cords, etc. as you may cause outages for your neighbors.
    18. Thunderhill Raceway Park is not responsible for theft, damage, or loss of property.
    THUNDERHILL SCHEDULE

    2026 Tire Rack SCCA Time Attack Challenge

    May 30th-31st, 2026

    Event Schedule

    *Schedule subject to change

    Friday, May 29th

    5:00PM Gates Open
    6:00PM Check-In + Tech Opens
    8:00PM Check-In + Tech Close

    Thunderhill West, Saturday, May 30th

    7:00AM Check-In + Tech Open
    7:30AM Workers Meeting
    8:00AM Driver's Briefing 
    8:15AM Novice Huddle
    9:00AM
    		 Novice Pace Laps
    9:15AM TA Group 1 - Practice Session 
    9:30AM TA Group 2 - Practice Session 
    9:45AM TA Group 3 - Practice Session 
    10:00AM TA Novice 4 - Practice Session 1
    10:15AM FLEX
    10:25AM  TA Group 1 - Time Attack 1: Session 1
    10:40AM TA Group 2 - Time Attack 1: Session 1
    10:55AM TA Group 3 - Time Attack 1: Session 1
    11:10AM TA Group 4 - Time Attack 1: Session 1
    11:25PM Drift - LoneStar Drift
    12:20PM
    LUNCH - Check-in and Tech closed
    1:20PM TA Group 1 - Time Attack 1: Session 2
    1:35PM TA Group 2 - Time Attack 1: Session 2
    1:50PM TA Group 3 - Time Attack 1: Session 2
    2:05PM TA Group 4 - Time Attack 1: Session 2
    2:20PM FLEX
    2:30PM TA Group 1 - Time Attack 1: Session 3
    2:45PM TA Group 2 - Time Attack 1: Session 3
    3:30PM TA Group 3 - Time Attack 1: Session 3
    3:15PM TA Group 4 - Time Attack 1: Session 3
    3:30PM Drift - LoneStar Drift
    4:00PM SCCA TA Practice Laps on East Course
    5:00PM Course Closed

    Thunderhill East, Sunday, May 31st

    8:00AM Driver's Briefing
    9:00AM GTA on track
    9:45AM TA Group 1 - Time Attack 2: Session 1
    10:00AM TA Group 2 - Time Attack 2: Session 1
    10:15AM TA Group 3 - Time Attack 2: Session 1
    10:00AM Flex followed by SRF and Spec Corvette Racing
    11:40AM GTA on Track
    12:25PM TT Group 1 - Time Attack 2: Session 2
    12:40PM TT Group 2 - Time Attack 2: Session 2
    12:55PM TT Group 3 - Time Attack 2: Session 2
    1:10PM Lunch
    2:10PM GTA on Track
    2:55PM TT Group 1 - Time Attack 3: Session 1
    3:10PM TT Group 2 - Time Attack 3: Session 1
    3:25PM TT Group 3 - Time Attack 3: Session 1
    3:40PM Flex followed by SRF and Spec Corvette Racing 
    4:00PM SCCA TA Podium Celebration
    5:00PM Course Closed

    PAYMENTS, WITHDRAWALS & REFUNDS

    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.

     

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