Sat, Apr 24 - Sun, Apr 25, 2021

NASA at Thunderhill Raceway Park

Thunderhill Raceway Park

About this event

Welcome to Round 3 at Thunderhill Raceway!  We will be joined by guest group Great American Stockcar Series (G.A.S.S.).

  Still want to drive?  Sign up at the track this weekend!

No passengers allowed for this event.  HPDE 1 will have lead-follow instructions. No Kids' Club or NASA BBQ for this event.  Masks/face coverings required AT ALL TIMES.  Camping in the paddock is allowed.  Cafe will be open!  Thunderhill specific COVID-19 protocols:

Click here to complete the online Thunderhill waiver form:

FRIDAY TEST DAY, April 23: Open track and race testing event,


If you do not see the HPDE Group that you want, it means that it's full.  If you are unsure of which HPDE level to choose, check here for more info:

HPDE / TT Groupings for this event:


- HPDE 1 & 2
- HPDE 3
- HPDE 4
- TT


- HPDE 1 & 2
- HPDE 3 
- HPDE 4
- TT


There will be at least four 20-minute sessions. Please see the prerequisite page to make sure you are eligible.
Sunday only entrants MUST have completed a prior Sunday HPDE3 event to be eligible.


There will be at least four 20-minute sessions. Please see the prerequisite page to make sure you are eligible.


All regular NASA race groups: AI, AIX, CMC, FFC, GTS, PRC, PT, ST, HC, NP01, SM, SI, ST, STR, SU, SpecE30, SE46, SpecZ, Pro, Semi-Pro, Thunder Roadster.

LATE REGISTRATION FEE: Online registration closes Tuesday at 6 PM week of the event.  After that, all registrations must be done at the track and pay a $100 late fee.

License: Your license is good for one season.  Purchase your season license online in your member account.  Apply for a new NASA license here:

Medicals: if your medical is expired, you're ineligible to race!  Use this link to renew your medical info:


Spec Miata / Spec E30 drivers may Supersize to ST.


There is a STRICT sound limit of 101 dBA measured 50’ from the line on driver’s right, apex of T15.  Attempts to fool the meter or lift will easily be detected by the track’s dedicated sound person (they hate that!).  So, please prepare to adjust your muffling system if necessary.  This is the same standard that has been in place for years.



Please review the Acceptance Package for more info:

There is a $10 fee per person per event at the gate (Keep your stub for the weekend).

Helmet rentals WILL be available at Thunderhill from Ken at I/O Port.  You can also rent them ahead of time:

Schedules and paddock maps will not be available until the week of the event.

Your car must be tech'd before going on track.


HPDE/School/Open Track: Full refund less $30.00 processing fee, with at least 1 week notice prior to the event, otherwise no refunds or credits. No exceptions.

Race Groups: Fees are fully refundable, less a $30 processing fee, provided that you registered at least 12 days in advance and you notify your NASA region within 5 days following the missed event. No partial refunds allowed. This policy does not apply to special events. Once the car hits the track all fees are non refundable.


Online Registration is Closed. Sign up at the track.

For more details, visit

Thunderhill Raceway Park


HPDE organized by

NASA - California- Northern Region