Timothy grass (phleum pratense) is not a grass native to North America, it was introduced there by an immigrant named Timothy (hence the name timothy hay) who brought seeds of an alpine grass from his native Sweden. It is typically grown in the north western states near the Canadian border in rich volcanic soil, so those crops have become known as western timothy. The best of the grass is grown at higher altitude in cooler states such as Nebraska where Oxbow is located but it ranges across to as far as Oregon on the west coast. It will grow at lower altitudes but does not have the same beneficial mineral content as the western timothy and is generally just referred to as timothy.