One Medieval farm and one coeval summer farm in the Swedish province of Jämtlandare discussed in the framework of a demographic and economic expansionfrom the regional introduction of agriculture in the early 3rd century until theagrarian crisis in the 14th and 15th centuries. The farm was deserted, while neighbouringfarms specialising in iron production were not. The summer farm, on theother hand, was first used around the time of the crisis.Households in Jämtland had a diversified economy including outland-productionof goods for the European market, for example, squirrel and beaver furs, elkhides and iron bars. This provided flexibility for the households, allowing them tosubsist on barley cropping in a marginal agricultural area, and thus surviving theLate Medieval agrarian crisis. They even increased their outland production ofexport commodities.