Agriculture was a very important factor in the development of the Markstay-Warren area. In 1941, the National Census listed 84 farms in the Hagar area, many of which were large-scale operations. Agriculture in the area was highly varied; sheep, dairy, cattle, poultry and pig farms could all be found in the area, as well as crops such as oats, wheat, mixed grains, potatoes and cultivated hay. By 1951, almost half of the population of the township lived on farms.
Agriculture was particularly prevalent in the Warren area due to the flat terrain and abundance of arable land. This prevalence led to the formation of the Warren Agricultural Society, which held its first annual agricultural fair in 1907. The Warren Fair still continues to this day, and over the years has featured midways, light horse shows, a beer garden, a heavy horse pull, 4x4 truck pull and western riding.