Founded in 1954 by a group of sport riding enthusiasts in Northern California, the American Federation of Motorcyclists is the oldest organization in the country dedicated soley to motorcycle road racing AFM, Inc.
395 Taylor Blvd. #130
Pleasant Hill, CA 94523
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2018 Rulebook


Click for Thunderhill Park Official Site

General Directions

Thunderhill is located near the town of Willows, which is about 85 miles north of Sacramento on Interstate 5. There are a few small Thunderhill/SCCA signs on I-5 at Willows, but you'll have to keep an eye out for them.

From wherever you are: make your way to I-5 and head north or south (as is appropriate) towards Willows. At Willows, take the Hwy 162 exit and head west for about 7 miles until you reach the Thunderhill gate.

Use MapQuest to get directions from your location to Thunderhill.

Track Specifics

Thunderhill as the AFM runs it is approximately 3 miles long, in a counter-clockwise direction. The course is in the low foothills and is laid out following the terrain. There are elevation changes, but the overall change is small at around 15-20 feet. Almost the whole course can be seen from the pit area, which is good since there are presently no access roads surrounding the course. The SCCA has designed the course to best use the terrain while creating some interesting turns reminiscent of favorite ones from other facilities. For a full-page map of the AFM configuration, visit the Forms section or click here to open the PDF.

Thunderhill Paddock Layout

The AFM race weekends generally utilize a paddock layout like the one below. UPDATED JUNE 4th, 2010

Early Descriptions of the Track

We have chronicled the notes and comments of an early scouting party to the Thunderhill (before the extra course additions). These are from the first racing motorcyclists ever to run the course. You can read them on the Racers Perspective page.

Local Accommodations and Resources

There are a number of motels to choose from in Willows, as well as a number of restaurants, fast food, a grocery store, a couple of parts stores, and a Wal-Mart, etc. Chico or Sacramento probably have the closest motorcycle shops. For a list of local hotels, visit the Thunderhill Raceway Lodging Page.

2018 Race Schedule

March 17-18 Buttonwillow

April 14-15 Buttonwillow

May 26-27 Thunderhill

June 16-17 Thunderhill

July 7-8 Thunderhill

Sept 1-2 Sonoma

Oct 20-21 Thunderhill

AFM Board Meetings

Board meetings are typically held the 2nd Wednesday of every month. General Meetings start at 8:00pm.

 Next Meeting Date:

Wednesday, January 10, 2018

 Meeting Location:

Looking Point
391 Taylor Blvd, Suite 120
Pleasant Hill, CA 94523

2018 Rule Book

2018 AFM Rulebook is now available for download HERE

Club Sponsors

Pirelli - CT Racing
GP Suspension
Club Sponsor

Class Sponsors

Formula Pacific Class Sponsor
250 Superbike Class Sponsor
350 Production  Class Sponsor
600 Production Class Sponsor
Open Production Class Sponsor
Open Superbike Class Sponsor
Formula 1 Class Sponsor
Formula 1 Class Sponsor
750 Superbike Class Sponsor
Open GP Class Sponsor
Formula 3 and Lightweight Twins Class Sponsor
Formula 40 Light, Middle and Heavy Class Sponsor
Afemme Class Sponsor
AKTM 390 Cup and KTM Masters Class Sponsor
New Racer School Sponsor

Support Sponsors

Club Sponsor
Official AFM Beer
RAM Print And Communications
Axial Video Systems

Contact Info

AFM Inc.

395 Taylor Boulevard, #130
Pleasant Hill, CA 94523
Phone: 510-833-RACE
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Getting Started Is Easy

  • Complete information about the Licensing/Membership process can be found on the Membership Information page.
  • Or call us at: 775-338-8530 and leave complete contact information.