The summer of 1972 was the first motocross race in Southwick. The race was located off route 10 + 202 in Southwick. The collaboration of the local police and American legionaries raised $3000.00 for the Jimmy Fund. The following year 1973 in July the first Motocross 338 race was held at the American Legion Post 338. The New England Sports Committee followed with scheduled of events during summer and fall of that year.

The Southwick Motocross 338 track is approx. 1 1⁄4 mile in length on 28 acres owned by the American Legion Post 338.

In 1989 Southwick Moto-X 338 became incorporated.
The first Southwick AMA National Motocross 125cc and 250cc event was held in 1976. Presently Moto-x 338 has held 31 consecutive AMA national events.

In 1984 Moto-X 338 started racing 3 and 4 wheelers. The following year Moto-x 338 had their own racing ATV club, which lasted nine years.

The first Grand National ATV championship event was held in 1987. The following next consecutive six years Moto-X 338 held a Grand National ATV Championship events.

Moto-X 338 has also held Loretta Lynn qualifiers, AHRMA Vintage Nationals, AHRMA Northeastern Motocross series, ACR events and a Cowabunga Classic in 1993.

2006 Was the first year the track was raced in the reversed direction for the AMA National and local racing.