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AdvancedShore entry

Jackson Blue Spring

Florida, United StatesDirections
Extensive overhead cave system with strong outflow at the entrance5–27 m (16–90 ft) depthShore entry

Jackson Blue Spring at a glance

Jackson Blue Spring is an advanced shore dive site in Florida, United States with depths of 5–27.4 m (16–90 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Largemouth bass, Bluegill, and American eel. Check the latest conditions and entry details before you go.

Moderate window now· until 18:00 · sunset 17:58

Wind forecast for this hour · 17:00 · run 5 h ago
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Tap a factor for its source and model point

Site hazards: Extensive overhead cave system with strong outflow at the entrance

Read the full hazards ↓

Dive windows this week

Lightest wind: Tue
Sun13:00–18:00 moderate

12 kn wind (12 kn wind)

Mon7:00–8:00 favorable, 8:00–9:00 moderate, 11:00–12:00 moderate, 12:00–18:00 favorable

11 kn wind (11 kn wind)

Tue7:00–18:00 favorable

8 kn wind (8 kn wind)

Wed7:00–10:00 moderate, 10:00–18:00 favorable

10 kn wind (10 kn wind)

Thu7:00–11:00 moderate, 11:00–18:00 favorable

10 kn wind (10 kn wind)

Fri8:00–10:00 moderate, 10:00–18:00 favorable

10 kn wind (10 kn wind)

Sat7:00–10:00 moderate, 10:00–18:00 favorable

9 kn wind (9 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wind forecasts. Numbers under each bar are daylight averages.

First light 6:25 · Sunrise 6:50 · Sunset 17:58 · some windows run past sunset

Source: Open-Meteo wind · updated 25 Oct, 12:23 GMT-5

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Jackson Blue Spring

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Known for: Largemouth bass, Bluegill, Suwannee cooter (turtle)
Best time: Year-round for permitted cave divers (72 F water, typically excellent visibility); off-season (after Labor Day to before Memorial Day) avoids swim-season crowds and access restrictions.

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 86% of days have historically been favorable, wind has typically been 9 knots
  2. February, 79% of days have historically been favorable, wind has typically been 10 knots
  3. March, 82% of days have historically been favorable, wind has typically been 10 knots
  4. April, 87% of days have historically been favorable, wind has typically been 9 knots
  5. May, 91% of days have historically been favorable, wind has typically been 9 knots
  6. June, 94% of days have historically been favorable, wind has typically been 9 knots
  7. July, 99% of days have historically been favorable, wind has typically been 7 knots, historically most favorable
  8. August, 98% of days have historically been favorable, wind has typically been 8 knots
  9. September, 89% of days have historically been favorable, wind has typically been 8 knots
  10. October, 98% of days have historically been favorable, wind has typically been 8 knots
  11. November, 93% of days have historically been favorable, wind has typically been 8 knots
  12. December, 92% of days have historically been favorable, wind has typically been 8 knots

July has typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

Jackson Blue Spring is a first-magnitude spring at the head of Merritt's Mill Pond near Marianna and one of the most popular full-cave dives in the United States. The entrance at the main vent leads into miles of mostly large, clear, white-limestone passage with notable flow, commonly dived with stages and DPVs. Access is by permit through Cave Adventurers with a gate code for year-round entry; the basin doubles as a county swim park in summer.

caveshore

Extensive overhead cave system with strong outflow at the entrance — Full Cave certification required. Hazards: high flow (strenuous entry against current), silting in side passages, long penetrations commonly done with stages/DPVs, navigation complexity. Spring basin is closed to divers' staging during summer swim season hours; permit and gate-code system controls access.

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