Processing of U.S. Landsat ARD tiles resumed Thursday, November 15, 2018. U.S. ARD is available to download from EarthExplorer. Each U.S. ARD tile contains Top of Atmosphere Reflectance, Top of Atmosphere Brightness Temperature, Surface Reflectance, and Pixel Quality assessment information from 1982 (Landsat 4) to present (Landsat 8). ARD products are typically available for download within 25-27 days (Landsat 7) and about 15-17 days (Landsat 8) after acquisition.
Visit the U.S. Landsat ARD web page for more information.