SuperNats XXVII

230DAYS

2025 Winter Series

2025 TBA

2024 Pro Tour

78DAYS

SKUSA Mexico

15DAYS

2024 PKC

23DAYS

2024 TSRS

36DAYS

California ProKart Challenge

Round 2 - Mar 31-Apr 1, 2017 - Streets of Willow

RACE ENTRY

Race pre-entries may be submitted at a “packaged-price” discount through MotorSportReg.com. If you have any questions, email  This e-mail address is being protected from spambots. You need JavaScript enabled to view it or call 951-491-0808 for assistance.  NOTE: If you had a SKUSA membership in the past few years, you already have an account set up in MotorsportReg.

Pre-Entry – Enter Before the Cut-Off and Save!
The definition of a “PRE-ENTRY” is an entry received, with payment, at the ProKart Challenge office before midnight on the Monday prior to the event, and will qualify for the pre-entry pricing. Entries after this cut-off will have to be submitted at the event (starting Thursday afternoon 3-6pm, or Friday morning starting at 7:00am) at walk-up pricing.  See pricing below.  All race pre-entries will be confirmed via email within 2 business day of receipt at the PKC/SKUSA home office.  If you do not receive an email confirmation within 48 hours, please call 951-491-0808 to confirm that your entry has been received and is in process.

Pre-Entry closes at Midnight on Monday, March 27th, Anyone wanting to register for the race or Friday's practice after that time will have to sign-up at the track on Thursday, 3-6pm, Friday or Saturday starting at 6:30am. 

Capped Entries - Enter Early - Don’t Miss Out!
All classes will have a maximum amount of 40 entries per race.  Entries received after a particular class is filled will be placed on a waiting list and held pending cancellation openings.  Entrants will be notified directly of any change in status or availability and offered entry on a first paid, first served basis

Entry Fees
(NOTE: $325 Entry+Tires pricing is available on MotorsportReg.com

ALL CLASSES (active SKUSA membership required for race days):
  • $100 Practice Day (STREETS OF WILLOW ONLY)
  • $125 Pre-Entry Race Fees
  • $160 Post-Entry / At Track Race Fees
  • $20 Transponder Rental ( If you don't have your own )
  • $222+tax per set Evinco-M ‘Red’ practice or race tires (for all classes except Mini/Micro Swift). These tires may be re-used from event to event. Practice or race tires for Mini/Micro Swift (Evinco-H ‘Blue’) are $211+tax. All tires can be picked up at the track or shipped ahead of time for $10 Shipping and Handling (within CA) or $15 (outside CA).
    Note: Race Tires MUST have the special PKC stamp to pass tech.
  • $100 SKUSA Annual Membership (must be current member)
  • $40 Reserved Pit Space (15' x 30' and 15' x 40')
  • $50 Overnight Camping (in your pit spot)
  • $100 RV Spot.  (no hook ups) SOLD OUT 3/23 – purchase a pit spot AND Overnight Camping and we will find you space in the pits
  • $15 for 1-day or $25 for 2-day CREW / MECHANICS passes only – for those people wanting access to the hot pit/grid/tech/scales. Spectators do NOT have to purchase pit passes for this event, as long as they stay out of the grid (and other restricted) areas.
  • NOTE: SKUSA’s Spec Fuel (C12 for all classes) and Spec Oil (Motul 2T Grand Prix) are mandatory at this event, but are not available to purchase from PKC/SKUSA. Please make arrangements to get some from your local kart shop or team for this event.

Driver Age
As ALL driver’s ages must be verified, you must email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it or fax to (951) 491-0809 a copy of his/her birth certificate with the application for a SKUSA membership/racing license. Be sure to check the Classes section of this site or sections 15.3 and 20.1.2 of the SKUSA Rulebook for minimum age requirements of each class.