The ERS Major Land Uses (MLU) data series provides a snapshot of land use across the United States. While much of the MLU series is updated roughly every 5 years, cropland used for crops, the category representing the acres of land in active crop production, is updated on an annual basis.
Cropland used for crops has three main components: cropland harvested (including acreage double-cropped), crop failure, and cultivated summer fallow. In 2015 (the most recent estimate), the total area of cropland used for crops in the United States was 335 million acres, down 6 million acres from the 2014 estimate and about 5 percent below the 30-year average. In 2015, cropland harvested declined by 1 percent (3 million acres) over the previous year.
The area that was double-cropped—land from which two or more crops were harvested—declined by 1 million acres, a 13-percent decline from the 2014 double-cropped area of 8 million acres. Acres on which crops failed declined by 30 percent over the past year to 7 million acres, the lowest level since 2010.
Source:usda.gov