The high luminosity (HL) upgrade of the Large Hadron Collider (LHC) will help to achieve instantaneous luminosity a factor of five larger than the current value and will enable the experiments to increase their data sets significantly. However, the number of simultaneous proton-proton interactions in the time span of 25 ns will be as high as 200 at the HL-LHC. To mitigate these effects, the Compact Muon Solenoid (CMS) detector will be upgraded with a timing layer capable of detecting minimum ionizing particles (MIPs) with a timing resolution of 40 ps or less. The endcap region of the timing layer (ETL), covering pseudorapidity range from 1.6 to 3.0, will be constructed out of low gain avalanche detectors (LGAD). This poster will describe R&D with Hamamatsu (HPK) LGADs and their characterization at the Fermilab Test Beam Facility. Specifically, the poster will present the latest test beam results such as the timing performance after irradiation, the sensor uniformity, and the size of the inactive region between adjacent pads.