"Chodosh is defined in the Torah as including only grains in five categories: wheat, barley, oats, rye, and spelt. Any of these grains that took root before pesach become Yoshon after the second day of pesach. (According to some poskim this means that the planting has to occur not later than 3 days before the second day of pesach, others require 2 weeks before the second day of pesach.) If one of these grains missed this planting deadline, then it is considered as having been planted too late to be Yoshon for this year. This grain will be harvested several months later. From the time of its harvest (typically the July-
"There exist two kinds of crops: winter crops and spring crops. In the Northern Hemisphere (such as in America) winter crops are planted in the fall, remain in the ground though the winter (and more importantly for us, through pesach) to be harvested in the early summer. Since these crops were in the ground through pesach, by the time they are harvested they are Yoshon. In the USA, rye and spelt are both winter crops and are Yoshon (caution, “rye bread” contains wheat flour in addition to the rye and could thus be Chodosh). Spelt flour from Canada is also mostly Yoshon. However, rye or spelt products imported from elsewhere could be Chodosh.
"The same Torah which does not permit us to eat the meat of an animal that does not have split hooves or chew its cud, also does not permit us to eat from new grain harvest until the barley omer sacrifice was brought in the Bais Hamikdash on the second day of Pesach" (Rabbi Moshe Heinemann, Star-
"In Judaism, Yoshon (Hebrew: éùï ; "old [grain]") is a concept within Kashrut (the Jewish dietary regulations), based on the Biblical requirement not to eat any chodosh -