Vaughn will compete at Janus Rock ‘n’ Roll Denver, which doubles as the USATF Colorado State Half Marathon Championships A few months
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The 41-year-old clocks 1:09:36 to finish third at the Rock 'n' Roll Philadelphia Half Marathon.
The 39-year-old finished second at the inaugural event.
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The 2016 Olympic hopeful is part of a competitive field at the Rock 'n' Roll Virginia Beach Run Festival.
The 31-year-old is healthy again and gearing up for the Rock 'n' Roll Philadelphia Half Marathon on September 21.