I live in Rosebud now and previously did for several years.
Campers start coming as Amanda says around Melb Cup weekend and it builds up for the Xmas Holidays.
The majority have gone by the end of January, but plenty leave their setup there for the Easter hoidays.
If you ever try getting off the peninsula toward Melbourne on a Sunday evening you will see the 10'000s of weekender's crawling their way home.
I can't wait for the Peninsula Link freeway (Frankston Bypass), as I have to drive from Rosebud to Frankston at least every 2nd Sunday and don't
appreciate the almost double trip time due to the traffic
But despite the traffic problems it's great to see all the campers as they bring the peninsula to life each summer.