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Objective Reaction time is a common deficit following concussion, making its evaluation critical during return-to-play protocol. Without proper evaluation, an athlete may return-to-play prematurely, putting them at risk of further injury. Although often assessed, we propose that current clinical testing may not be challenging enough to detect lingering deficits. Thus, the aim of this study was to examine reaction time in concussed individuals three times over a 30-day period through the use of a novel reaction time device consisting of simple, complex, and go/no-go reaction time tasks. Methods Twenty-three concussed subjects completed simple, complex, and go/no-go reaction time tests at three different timepoints: within 7-, 14-, and 30-days of injury, and 21 healthy controls completed the three reaction time tasks during a single session. Results Independent t-tests revealed that for the simple reaction time task, concussed participants were only significantly slower at session 1 (p  = .002) when compared to controls. Complex reaction time task results showed concussed participants to be significantly slower at session 1 (p  = .0002), session 2 (p  = .001), and session 3 (p  = .002). Go/no-go results showed concussed participants to be significantly slower than controls at session 1 (p  = .003), session 2 (p  = .001), and session 3 (p  = .001). Conclusions Concussed individuals display prolonged reaction time deficits beyond the acute phase of injury, illustrated using increasingly complex tasks. [ABSTRACT FROM AUTHOR]