The Blue Cross Broad Street Run will be delayed until Oct. 4, race organizers and Independence Blue Cross announced Monday.
Race organizers posted a list of frequently asked questions for runners, including what to do if they can't make the new date.
"This decision was not taken lightly," organizers said on their website. "Based on recommendations by the CDC and after consulting with the City’s Health Department, this is the best way to keep all runners, volunteers, staff, and spectators as safe as possible during the COVID-19 pandemic."
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Philadelphia Mayor Jim Kenney said runners will automatically have their bibs transferred to the new date. Runners will also have the opportunity to defer their bib to the 2021 race without a financial penalty.
With more than 35,000 participants, the Broad Street Run is the largest 10-mile race in the country.