Most fireworks shows start around 9pm, just after sunset.
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Saint Pete Beach:
6850 Beach Plaza

Treasure Island:
On the beach 104th Avenue & Gulf Boulevard.

Redington Beach:
182nd Ave and Gulf Blvd

Madeira Beach:
Around 150th Avenue & Gulf Boulevard

Clearwater Beach:
Over the Memorial Causeway
Past Fireworks Show Article

Tarpon Springs:
Sunset Beach