HUMBOLDT, Kan. -- The fourth season of the USRA Iron Man Challenge will kick off the 2013 campaign as the USRA B-Mods join the USMTS Modifieds at the Humboldt Speedway in Humboldt, Kan., on Friday, March 8, and the Valley Speedway in Grain Valley, Mo., on Saturday, March 9.

Both events will pay $500 to win and $75 to start the main event, with the USRA B-Mods sharing the spotlight with the USMTS Modifieds both nights.

USRA B-Mod drivers return to Humboldt two weeks later to compete all three nights during the King of America III Modified Nationals on Thursday, Friday and Saturday, March 21-23.

The fourth season for the USRA Iron Man Challenge featuring USRA Stock Cars and USRA B-Mods boasts 24 dates at 11 of the finest dirt ovals in Iowa, Kansas, Minnesota, Missouri and South Dakota.

Both classes will be in action on 11 of those nights, USRA B-Mods will fly solo at 11 events and USRA Stock Cars have three dates to themselves.

Last season 360 tough-as-nails pilots took part in the Iron Man Challenge, including 86 USRA Stock Car drivers and 274 USRA B-Mod competitors.

The USRA Iron Man Challenge will run in conjunction with the USMTS Modifieds at all but two events. It will be a Great American, all-USRA affair on the Fourth of July at the Upper Iowa Speedway in Decorah, Iowa, and the USRA Stock Cars visit the Deer Creek Speedway in Spring Valley, Minn., for the fourth and final time in 2013 when they share the race card with the World of Outlaws Sprint Car Series on Saturday, Sept. 14.

USRA Stock Cars open their 2013 campaign the following weekend, March 29-30, at the LA Raceway in La Monte, Mo., on Friday and I-35 Speedway in Winston, Mo., on Saturday. Both nights will also feature USRA B-Mods along with the USMTS Modifieds.

Points will be determined by the best fifteen (15) finishes for USRA B-Mods and best 10 finishes for USRA Stock Cars. To be eligible for points funds, drivers must possess a valid USRA license, utilize the American Racer KK704 racing tire on all four wheels and compete in at least half of the events for their division. Licensed USRA drivers in both classes will also earn national points in the USRA Weekly Racing Series.

Both Iron Man Challenge champions in 2013 will earn $1,500 as part of the series points fund, plus numerous contingency awards from the many generous USRA sponsors.

Tom Schmitt of Independence, Iowa, is the defending USRA Iron Man Challenge champion in the USRA Stock Car class and Trevor Hunt of Kearney, Mo., was the 2012 titlist in the USRA B-Mod division.

The Humboldt Speedway is a located 0.1 mile west of US 169 at the Humboldt exit, then 0.5 mile south, then 0.9 mile east on Georgia Rd. For more information call 620-431-2470 (office) or 620-473-3694 (track) or visit www.humboldtspeedway.com online.

The Valley Speedway is a 1/3-mile semi-banked dirt oval located 0.9 mile south of I-70 (exit 24) on Main St. (Buckner-Tarnsey Rd.), then 0.4 mile east on Old US 40 in Grain Valley, Mo. For more information, call 816-229-2222 or visit www.valleyspeedway.com online.

To learn more about the USRA, visit www.usraracing.com or call 515-832-6000. You can also like us on Facebook at www.facebook.com/usraracing or follow us on Twitter at www.twitter.com/usraracing.

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USRA OFFICIAL SPONSORS: American Racer Racing Tires, Day Motor Sports, Dominator Race Products, Intercomp, KEVKO Oil Pans & Components, Nitroquest, RACEceiver, RacinDirt.com, Radical Racegear.

USRA PARTICIPATING SPONSORS: Boubin Tire & Automotive, BRODIX Cylinder Heads, Erson Cams, Integra Racing Shocks & Springs, Sybesma Graphics.

USRA CONTINGENCY SPONSORS: AERO Race Wheels, AFCO Racing Products, ASi Racewear, Beyea Custom Headers, COMP Cams, CPD Racing Tools, Crane Cams, Edelbrock, Eibach Springs, Fast Shafts, Forty9 Designs, Genesis Racing Shocks, Hooker Harness, KSE Racing Products, Marsh Racing Wheels, New Vision Graphics, PBM Performance Products, Quarter Master, Real Racing Wheels, Tiger Rear Ends, Wehrs Machine & Racing Products.