What is the statute of limitations for parking tickets in philadelphia?

As laws vary form place to place, you would have to check with the issuing authority in Philadelphia to resolve this citation. There typically isn't one. The Statute of Limitations is to prevent someone being accused of something years after it happened when witnesses are not available and memories are not fresh. A ticket eliminates this issue. Once a ticket has been issued, there is no requirement that there be any sort of time frame associated with resolving it.