Update: Tuesday's event at the I-35 Speedway has been rained out and postponed to Tuesday, July 12.

MASON CITY, Iowa -- Five more races remain in the most grueling stretch of races for the USMTS Casey’s General Stores National Tour powered by Swan Energy as USMTS Summer Speedweeks kicks off this Tuesday, June 21, at the I-35 Speedway in Mason City, Iowa.

This will be the third straight year the series has invaded the half-mile clay oval at the North Iowa Fairgrounds. Ryan Ruter captured the inaugural event in 2009 while Mike Steensma won his career-first USMTS feature in last year’s standing-room-only tilt.

Gates open at 5 p.m. with hot laps at 7 and racing at 7:30. The I-35 Speedway is a 1/2-mile semi-banked clay oval located off of I-35 at Exit 194, then 5.1 miles east on SR 122 (at the North Iowa Fairgrounds). For more information, call the track hotline at 641-424-6515 or visit www.i-35speedway.com online.

On Wednesday, action moves to the Buena Vista Raceway in Alta, Iowa, for the 4th Annual Battle at the Beaver with gats opening at 5 p.m., hot laps at 6:30 and racing getting underway at 7 p.m.

After four events, four different drivers have conquered the 3/8-mile semi-banked dirt oval. Kelly Shryock won the inaugural event in 2008 while two visits were made in 2009 with Al Hejna and Jason Hughes emerging victorious. Last season, Ryan Gustin made ‘The Beaver’ home to one of his 16 wins on the season.

Pit gates will open at 5 p.m., grandstands open at 6, hot laps begin at 6:30 and the first heat race is scheduled to take the green flag at 7 p.m.

Race fans can pick up $2-off coupons on Thursday at Casey's General Stores locations in Alta, Aurelia and Storm Lake. To find the Casey's location nearest you, check out www.caseys.com online.

The Buena Vista Raceway located 0.5 mile east of CR M31 on SR 7 (at the Buena Vista County Fairgrounds). For more information, call 712-664-2662 or 712-284-2561 or visit www.buenavistaraceway.com.

The 7th Annual All-Star Challenge takes place on Thursday, June 23, at the Park Jefferson Speedway in Jefferson, S.D., where again no driver has captured more than one USMTS main event in the previous six shows.

Local favorite Jay Noteboom showed the way in the 2005 event while Kelly Shryock came back to win in 2006. Jason Krohn was the winner in 2007 en route to his first and only USMTS National Championship, Jason Hughes took the top prize in 2008 and Jon Tesch won on his 33rd birthday on June 16, 2009. The defending event champion is Ryan Gustin.

Race fans will get even more bang for their buck as Thursday’s program will also feature the Iron Man Challenge featuring USRA Stock Cars and B-Mods, plus USRA Hobby Stocks. Gates open at 5 p.m., hot laps start at 7 and races begin at 7:30.

Coupons good for $2 off adult admission will be available on race day at the Casey's General Stores locations in Elk Point and throughout nearby Sioux City.

The Park Jefferson Speedway is a 4/10-mile semi-banked clay oval located off of I-29 at Exit 4, then 2 blocks east to SR 105, then 1.8 miles north. For more information, call 515-832-7944.

On Friday, it’s on to the Rapid Speedway in Rock Rapids, Iowa, for the first race at the 3/8-mile semi-banked dirt oval since the 2008 campaign.

Three different drivers have won in the three previous stops at the facility. Kelly Shryock took the win in the USMTS debut in 2006, Jon Tesch triumphed in 2007 and Jason Krohn won the lat time the series visited in 2008.

The Iron Man Challenge featuring USRA Stock Cars and B-Mods plus USRA Hobby Stocks will round out Friday night’s blockbuster slate. Gates open at 5 p.m. with hot laps at 7 and racing at 7:30.

The Rapid Speedway is a located 0.5 mile east of US 75 on SR 9, then 0.5 mile south on South Tama St. (at the Lyons County Fairgrounds). For more information, call the track hotline at 712-472-3742.

Race fans can pick up $2-off coupons on Friday at Casey's General Stores locations in Hull, Luverne, Rock Rapids and Sibley.

The USMTS Casey’s General Stores National Tour powered by Swan Energy heads north for the final event of USMTS Summer Speedweeks and the third annual event at the North Central Speedway in Brainerd, Minn., on Saturday.

Three races have been held at the 1/3-mile semi-banked clay oval, and three familiar names have found victory lane. A doubleheader in 2009 saw Jon Tesch and Kelly Shryock take he wins while Jason Krohn turned his season around last year with a win at NCS.

The Brainerd Lakes area is a popular tourist destination with plenty of fun and adventure for the whole family before and after the races. Check out www.explorebrainerdlakes.com for more information.

The green flag waves to start the first heat race at 6:45 p.m. on Saturday.

The North Central Speedway is a semi-banked 1/3-mile clay oval located 5 miles south of Brainerd at the junction of US 371 and Bus 371. For more information, visit the track's website at www.racencs.net or call 218-839-9280. Race day information is available by calling the track hotline at 218-829-1545.

Race fans can pick up $2-off discount coupons on Saturday at all Casey’s General Stores locations in Little Falls, Long Prairie, Milaca and Wadena. For more information or to find the Casey’s location nearest you, check out www.caseys.com online.

USMTS SUMMER SPEEDWEEKS:

Tue Jun 7 ... Huset’s Speedway, Brandon, S.D. (winner: Kelly Shryock).
Wed Jun 8 ... Red River Valley Speedway, West Fargo, N.D. (winner: Ryan Gustin).
Thu Jun 9 ... Casino Speedway, Watertown, S.D. (winner: Kelly Shryock).
Fri Jun 10 ... Brown County Speedway, Aberdeen, S.D. (winner: Corey Dripps).
Sat Jun 11 … Jamestown Speedway, Jamestown, N.D. (winner: Ryan Gustin).
Sun Jun 12 … Nobles County Speedway, Worthington, Minn. (winner: Rodney Sanders).
Mon Jun 13 … Mineral City Speedway, Fort Dodge, Iowa (winner: Kelly Shryock).
Thu Jun 16 … Central Wisconsin Raceway, Unity, Wis. (winner: Kelly Shryock)
Fri Jun 17 … Cedar Lake Speedway, New Richmond, Wis. (winner: Ryan Gustin)
Tue Jun 21 … I-35 Speedway, Mason City, Iowa.
Wed Jun 22 … Buena Vista Raceway, Alta, Iowa.
Thu Jun 23 … Park Jefferson Speedway, Jefferson, S.D.
Fri Jun 24 … Rapid Speedway, Rock Rapids, Iowa.
Sat Jun 25 … North Central Speedway, Brainerd, Minn.

To learn more about the United States Modified Touring Series, visit www.usmts.com online or call 515-832-7944. You can also follow the USMTS on Facebook, MySpace, Twitter and YouTube.

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USMTS TITLE SPONSORS: Casey’s General Stores, Swan Energy.

USMTS OFFICIAL SPONSORS: American Racer Racing Tires, Awesome Race Suits, Cheetos, Intercomp, Karl Chevrolet, KEVKO Oil Pans & Components, New Vision Graphics, Nitroquest, RACEceiver, SLAP Energy, Snickers.

USMTS PARTICIPATING SPONSORS: Arnold Motor Supply, ASi Racewear, BRODIX Cylinder Heads, DAY Motor Sports, Dirthead.com, DirtKnights.com, Dirt Track Racing School, DrySlik Dirt Trak Racewear, Farm Boy BBQ Sauce, Intensitee Custom Racewear, Karl Performance Parts, Mesilla Valley Transportation, Olympic Fire Protection, Ramirez Race Cars, Ruter Farms, Schwab’s Tinker Shop, Sybesma Graphics, Yeager Machine.

USMTS CONTINGENCY SPONSORS: AFCO Racing Products, COMP Cams, CPD Racing Tools, Eibach Springs, Erson Cams, Fast Shafts, Forty9Designs.com, Genesis Shocks, Hooker Harness, Hypercoil Springs, ISKY Racing Cams, The Joie of Seating, KSE Racing Products, Marsh Racing Wheels, Out-Pace Racing Products, PBM Performance Products, Quarter Master, Real Racing Wheels, RHS – Racing Head Service, Tiger Rear Ends, Wehrs Machine & Racing Products, WIX Filters.