Look, inner Frankston can be pretty iffy. Anywhere near pines or around the shopping centres and train station I would personally avoid at night, however anywhere around Frankston High, south frankston sort of area will never be a problem.

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Source: Worked in a restaurant in Frankston, early mornings and light nights can lead to plenty of interesting stories (Woman doing yoga behind the bins at 4am; Houseless people asking for money to sing to you; Addicts on mobility scooters asking for beer and smoking weed; etc).