Most New Jersey beaches are free in the off-season from the day after Labor Day till the days before Memorial Day. Keep in mind though that even though most New Jersey beaches are free in the off-season, it's extremely rare that lifeguards will be on duty. So build sandcastles.
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Municipalities charged the equivalent of $16 to $20 per person, in today's dollars, as a way to keep local taxes low and the riffraff out. Because most New Jersey's beach towns are tiny, without a lot of revenue other than property taxes, the economic boon became a cottage industry for the Shore.