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High-precision photometry from space-based missions such as K2 and TESSenables detailed studies of young star variability. However, becausespace-based observing campaigns are often short (e.g., 80 days for K2),complementary long-baseline photometric surveys are critical for obtaining acomplete understanding of young star variability, which can change ontimescales of minutes to years. We therefore present and analyze light curvesof members of the Upper Scorpius association made over 5.5 years by theground-based Kilodegree Extremely Little Telescope (KELT), which complement thehigh-precision observations of this region taken by K2 during its Campaigns~2and 15. We show that KELT data accurately identify the periodic signals foundwith high-precision K2 photometry, demonstrating the power of ground-basedsurveys in deriving stellar rotation periods of young stars. We also use KELTdata to identify sources exhibiting variability that is likely related tocircumstellar material and/or stellar activity cycles; these signatures areoften unseen in the short-term K2 data, illustrating the importance oflong-term monitoring surveys for studying the full range of young starvariability. We provide the KELT light curves as electronic tables in anongoing effort to establish legacy time-series datasets for young stellarclusters.

Identification of Young Stellar Variables with KELT for K2 II: The Upper Scorpius Association