DiveLine LogoDiveLine LogoDiveLine
Blog
⌘K
Sign UpLogin

DiveLine

Your ultimate dive buddy for the perfect underwater experience.

Features

  • Dive Map
  • Buddy Matching
  • Live Conditions
  • Dive Reports

Resources

  • Buy Us a Coffee
  • Contact Us

Contact

  • [email protected]
  • +1 (831) 566-8793
  • Laguna Beach, CA, USA

© 2025 DiveLine. All rights reserved.

Privacy PolicyTerms of Service
Scuba diving at Alligator Reef in Upper Keys
Back

Alligator Reef

POOR
Upper KeysBoat
About This Site
Alligator Reef is a vibrant coral reef system marked by the historic Alligator Reef Lighthouse. Located approximately four miles offshore from Islamorada, this protected area within the Florida Keys National Marine Sanctuary offers diverse underwater habitats including patch reefs, spur-and-groove formations, and sandy plains that support abundant marine life.

Difficulty

Beginner

Max Depth

14m

Type

Boat

Typical Visibility

18m

Conditions Summary

Best time today

6AM - 7AM

GREAT

Best day in forecast

Sunday

GREAT

2026-03-22

Community-reported visibility

n/a

Warnings for today

  • Strong winds expected
  • Rain expected - bacteria levels may increase

Southeast-facing reef 4 miles offshore from Islamorada. The Keys chain provides excellent protection from north and west, but east through south swells from the Atlantic hit at full strength. Reef structure dissipates some wave energy, though shallow sections get surgy when Atlantic swells are up.

NNEESESSWWNW
Protected
Partially Exposed
Exposed
Loading...
Nearby Dive Sites
Carysfort ReefChrist of the AbyssSpiegel GroveMolasses Reef