Florida Keys, United States
    Biscayne National Park

    Ajax Reef

    Best months: Apr–Jun

    Protected Area

    Biscayne National Park

    Why dive here

    With 87+ marine species recorded in the area - including bull sharks, dolphins, hammerhead sharks, seahorses and sea turtles - Ajax Reef offers some of Florida Keys's richest reef diving. Water ranges 19-32°C, warmest July, August, September.

    Best timeApr–Jun
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBull Sharks, Dolphins, Hammerhead Sharks, Seahorses and Sea Turtles · 87+ species recorded
    Water19-32°C · warmest July, August, September
    CharacterReef dive
    StandoutRich in charismatic marine life

    Ajax Reef, out in the Islamorada sanctuary, often gets overshadowed by its flashier neighbours, but we think that’s a mistake. It’s not just another Florida Keys reef; it’s a living, breathing example of resilience. Drop down here and you’ll find a sprawling coral labyrinth. We love the way the light plays through the deeper channels, illuminating huge heads of rose coral and artichoke coral. Keep an eye out for the yellow stingrays often tucked into sandy patches. What makes Ajax special for us are the schools of fish – not just a few stragglers, but proper groups of ocean triggerfish and schoolmasters moving in unison. We’ve spent whole dives just watching them drift past. The harlequin bass and black margates are also a constant presence, darting between the fire coral. It’s a great spot for macro too; we’ve often found banded pipefish hiding in the gorgonians. If you’re a diver who prefers a quieter, more intimate reef experience over dramatic walls, Ajax is your kind of place. Go on a weekday morning to really have it to yourself.

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    Conditions

    Ocean conditions, forecast and tides for Ajax Reef

    Ajax Reef Ocean Conditions

    Monthly averages for Ajax Reef, sourced from NOAA NDBC + Copernicus Marine (EU) - nearest station: 8725520 - Fort Myers, FL (28km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    27°C

    81°F · Range: 20.9–31.1°C

    Air Temperature

    26°C

    79°F

    Current Speed

    0 cm/s

    Direction: S (180°)

    Salinity

    35.98 PSU

    Wind Speed

    2.7 m/s

    5.2 knots

    Atmospheric Pressure

    1014.5 hPa

    Based on 5 years of monitoring data · Data sources: NOAA NDBC + Copernicus Marine (EU)

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