SuperNats XXII


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Next ProKart Challenge Event

Closes Monday, Jan 29th at 10am

Round 1 - Buttonwillow February 2-3, 2018
Buttonwillow Raceway Park
24551 Lerdo Highway
Buttonwillow, CA 93206
(661) 764-5333
Google Maps

California ProKart Challenge

Round 1 - Feb 10-11, 2017 – Buttonwillow


Race pre-entries may be submitted at a “packaged-price” discount through Our web-challenged friends may use our DOWNLOADABLE entry form at a slightly higher entry price.  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 were sent an email from MotorsportReg detailing how to get your new account ready.

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 Friday morning) 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, February 6th,  Anyone wanting to register for the race or Friday's practice after that time will have to sign-up at the track on Friday starting at 7:00am 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.) 

ALL CLASSES (active SKUSA membership required for race days):
  • $75 Practice Day
  • $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)
  • $35 Reserved Pit Space
  • $50 Overnight Camping
  • $15 for 1-day or $25 for 2-day spectator passes for all guests, including mechanics (purchased ahead of time or at the track at the same price, 5 years old and under are No Charge)
  • 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. Buttonwillow Raceway will also have the spec fuel and oil for sale at their TIRE/FUEL SHOP on site.

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.


Buttonwillow Raceway Park
24551 Lerdo Highway
Buttonwillow, CA 93206
(661) 764-5333
Normal office hours are 7am to 5pm.
Call for track availability and open practice times/prices.

NOTE: Practice will not be allowed on Thursday, February 9th, due to the move-in of trailers and other vehicles that will inhibit karts safely pulling in and out of the grid.

Map And Directions ( Google Maps )

Overnight Parking and Camping
PKC has arranged for overnight parking of trailers, as well as overnight camping on site, starting Thursday afternoon, February 9th. Each reserved pit spot is $35; if you are camping overnight the spot is $50 as a flat fee for up to 3 total nights. If you wish to reserve a pit spot for your trailer, purchase it here. For an RV pit spot or camping for your toy hauler, purchase it here. Be sure to list your top 3 choices for each pit or camping spot.  We will contact you to confirm your reservations and add you to the map.

Fuel and Oil Sold at Track
Buttonwillow Raceway will have the spec fuel and oil for sale at our event. Call 661-764-5333 or email This e-mail address is being protected from spambots. You need JavaScript enabled to view it for more info or if you’d like to pre-order 1 liter bottles of Motul 2T Grand Prix and/or 5-gallon cans of C12. Pre-orders are optional.

Pit Vehicles
Although PKC prefers to disallow the use of motorized vehicles in order to avoid unnecessary accidents in the pits, this facility does allow motorized vehicles on their premises. However, PKC reserves the right to confiscate any vehicles, motorized or otherwise, that are being unsafely used anywhere on the kart track premises.
Pets On Premises
Dogs are allowed on the kart track premises, but must be kept on a leash at all times. No dogs allowed on grid. Please pick up after your pet.

Air Boxes and Silencers
For all motos, the silencer is open spec and air boxes are not required at this event.

Reserved and Unreserved Pit Spaces
An unreserved pit space is included at no charge with your race entry. However, the location of unreserved spaces is determined on a first arrive, first serve basis with no ability to choose a location or pit neighbor. As a result, you could arrive at “dark-30″ on Friday morning and still be a football field from the pre-grid or worse yet, you can’t get to the event until Saturday. Therefore, we have provided the ability to pre-reserve a pit space(s). In this manner, you choose the space you want now and that space will be available whenever you arrive. There is labor required to administrate pit space reservations, so a cost is involved. However, you will hopefully view the nominal $35/space charge as well worth it.
Reservation Instructions
Team Managers with block requests or those that need an irregular sized pit space, should call (951) 491-0808 or email This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
Reserve your Pit Space now in the Online Store

Spectator Tickets
1 and 2 day spectator passes are available through EventBrite and directly on the Spectator Pass page for this event. These passes include pit access, thus enriching the spectator experience through up close contact with the drivers and crew. Prices are $15 for a 1-day pass and $25 for a 2-day pass. Kids 5 and under are FREE, but everyone must sign an insurance waiver.

NOTE: The Buttonwillow facility charges ALL attendees (drivers, crew, team owners, and spectators) a $10 GATE FEE at the front entrance to the property. This is in addition to the Pit Pass charges that PKC requires for their insurance at the kart track. Please inform your guests that they will have to pay a total of $25 for entrance to this event if arriving on Saturday, or a total of $35 if they arrive earlier.

Course Map For This Event - Layout #1 (CCW WITH the kink)

Spectator Tickets and Will-Call

As part of an overall effort to expedite driver check-in, we have eliminated the use of "Will Call" lists, although purchasing your tickets via EventBrite below serves the same purpose. A few things will help us help you.
  • If you know the name of your guest, include it on the ticket. Adding their email address will even send a copy directly to them.
  • If you don't know the name of your guest that's ok too, but you must send them a copy of their ticket, even a screenshot of the barcode via text will work.
  • We can check someone in manually, but verification could delay their entry so make every attempt to provide them with their ticket.

Parents, Guardians and Team Principles

If you need to check in a driver for age or language reasons, you can still purcahse a ticket below to be used at Driver Registration, but please keep the non-drivers to a minimum so we don't bog their line down. 


Thursday, February 9th – Move-in Day Only

4-6pm Early Registration Open

Note: Practice will not be allowed on this day due to the move-in of trailers and other vehicles that will inhibit karts safely pulling in and out of the grid.

Friday, February 10th - Practice Day

6:30am Buttonwillow Gates Open
7:00am PKC Registration Opens

7:30am-3:00pm Tire Desk Open
9:00am-5:00pm Open Practice
Note: PKC will split the Friday practice sessions into X30 classes, Shifters, Mini and Micro groupings on site.

Saturday, February 11th - Race Day

6:30am -- Gates Open and Registration
7:00am –12:00 noon -- Tire Desk Open

Practice -- 7 minute sessions 
(Transponders Mandatory)

7:30am X30 Junior
7:40am S1 & S2
7:50am S4 Master/Super Master
8:00am S3 & S5
8:10am Micro Swift 
8:20am X30 Master
8:30am Mini Swift
8:40am X30 Senior

8:55am -- Drivers’ Meeting

Qualify -- 7 minute sessions 
9:20am X30 Junior
9:30am S1 & S2
9:40am S4 Master/Super Master
9:50am S3 & S5
10:00am Micro Swift
10:10am X30 Master
10:20am Mini Swift
10:30am X30 Senior 

Heat 1 -- 10 Laps
10:40am X30 Junior
10:55am S1 & S2
11:10am S4 Master/Super Master 
11:25am S3 & S5
11:40am Micro Swift
11:55am X30 Master
 12:10pm Mini Swift
 12:25pm X30 Senior

Heat 2 -- 10 Laps 
12:40pm X30 Junior
12:55pm S1 & S2
1:10pm S4 Master/Super Master
1:25pm S3 & S5
1:40pm Micro Swift
1:55pm X30 Master 
2:10pm Mini Swift
2:25pm X30 Senior

Main -- 18 Laps 
2:40pm X30 Junior
3:00pm S1 & S2
3:20pm S4 Master/Super Master
3:40pm S3 & S5
4:00pm Micro Swift (15 laps)
4:20pm X30 Master
4:40pm Mini Swift (15 laps)
5:00pm X30 Senior

Podium Presentations and Raffle to Follow Final Tech Inspection


ProKart Challenge has again arranged special pricing at the following local motels for this event.
For both motels, CALL (don’t book online) and be sure to say you are with "ProKart Challenge racing at Buttonwillow Raceway" to receive these discounted rates:
Motel 6 Central
20645 Tracy Ave
Buttonwillow, CA 93206
661-764-5121 phone
661-764-9631 fax
(Ask for “Gloria” if front desk does not verify the special rates below.)
Rooms are just $45.99 + tax for a single or double room (1 king or 2 queens), smoking or non. For the super-budget conscious, they also have a few (single queen) rooms facing the freeway that are just $39.99/night+tax. They offer trailer parking, in-room fridge, microwave, flat screen TVs, free internet, pets allowed at N/C. No in-room coffee, but they have a full hot coffee service in the lobby starting at 4am daily.
Super 8 Motel Buttonwillow (formerly Knights Inn - has switched back)
20681 Tracy Ave
Buttonwillow, CA 93206
661-764-5117 phone
661-764-6922 fax
Rooms are $45+tax for 1 queen bed, or $47.17+tax for 2 queens, or $50 for 1 king bed. Price includes continental breakfast every morning 6am to 9am (and starting at 5:30am on Saturday). They also have a flat screen TV, in-room fridge, micro, coffee, hair dryer, and FREE WI-FI in every room.

Camping at the track is allowed for a flat fee of $50. It is best to reserve space thru the ONLINE STORE before Feb. 7th. You have the option to pay at the track upon arrival, but will be parked wherever there is space available.



Cancellation/Refund Policy

Please read our Terms and Conditions page.

Pit Space Rules

  • Space reservations are on a first paid, first served basis
  • Unreserved spaces are on a first arrive, first served basis
  • All equipment must fit within your designated pit space. This includes: trailer; tents, karts, generators, pit carts, etc.
  • All vehicles (tow and otherwise) must be stored/parked in the participant parking area North of the pit area.
  • Other than rare exceptions, Motorhomes are prohibited in the main paddock and must be parked in the designated RV area. Overnight vehicles that ARE allowed in the main pit area are trailers or vehicles used to store and transport karts (i.e., toy boxes, fun movers, etc.)
    NOTE: If you are camping on-site overnight, you will need to pay a $50 camping fee, either thru the online shopping kart, or at the track on Friday night.
  • Pit space move-in starts on the Thursday afternoon prior to an event.
  • PLAN YOUR SPACE CAREFULLY — You are able to reserve a specific location(s) based on current availability.  If your space requirements subsequently change, you will be moved to the first available area that meets the new specification - which may not be anywhere near the original location. Pit space reservation priority is based on the receipt date of the location request AND payment (no payment, no reservation).