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Blue Grotto Spring

Florida, United StatesDirections
Open Water suggested3–31 m (10–100 ft) depthShore entry

Blue Grotto Spring at a glance

Blue Grotto Spring is an advanced shore dive site in Florida, United States with depths of 3–30.5 m (10–100 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Channel catfish, Largemouth bass, and Bluegill. Check the latest conditions and entry details before you go.

Moderate window now· until 19:00 · sunset 18:48

Wind forecast for this hour · 14:00 · run 12 h ago
—

Tap a factor for its source and model point

Site hazards: Cavern overhead below ~30 ft (large daylight zone considered safe for open water divers, but staying above 60 ft recommended without cavern training); gets dark and silty toward the 100 ft bottom; gated cave section requires full cave certification; solo diving prohibited.

Read the full hazards ↓

Dive windows this week

Lightest wind: Sun
Mon12:00–19:00 moderate

13 kn wind (13 kn wind)

Tue8:00–9:00 favorable, 9:00–19:00 moderate

11 kn wind (11 kn wind)

Wed8:00–13:00 moderate, 13:00–14:00 favorable, 14:00–19:00 moderate

11 kn wind (11 kn wind)

Thu8:00–11:00 moderate, 11:00–13:00 favorable, 13:00–15:00 moderate, 15:00–18:00 favorable, 18:00–19:00 moderate

12 kn wind (12 kn wind)

Fri8:00–11:00 moderate, 11:00–19:00 favorable

11 kn wind (11 kn wind)

Sat9:00–11:00 moderate, 11:00–19:00 favorable

11 kn wind (11 kn wind)

Sun8:00–19:00 favorable

8 kn wind (8 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 7:14 · Sunrise 7:38 · Sunset 18:48 · some windows run past sunset

Source: Open-Meteo wind · updated 26 Oct, 01:22 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Blue Grotto Spring

Forecast · NOAA tide model

Tide & slack timing

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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, Florida softshell turtle
Best time: Year-round, 72°F and weather-independent; weekdays are quieter than class-heavy weekends; visibility typically 100 ft+.

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, 88% of days have historically been favorable, wind has typically been 9 knots
  2. February, 91% of days have historically been favorable, wind has typically been 9 knots
  3. March, 85% of days have historically been favorable, wind has typically been 10 knots
  4. April, 91% of days have historically been favorable, wind has typically been 10 knots
  5. May, 97% of days have historically been favorable, wind has typically been 9 knots
  6. June, 90% of days have historically been favorable, wind has typically been 9 knots
  7. July, 98% of days have historically been favorable, wind has typically been 7 knots, historically most favorable
  8. August, 95% of days have historically been favorable, wind has typically been 8 knots
  9. September, 96% of days have historically been favorable, wind has typically been 8 knots
  10. October, 96% of days have historically been favorable, wind has typically been 9 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 9 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

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated June 2026

Site details

Blue Grotto is a privately operated sinkhole/cavern dive resort in Williston and one of Florida's most popular training sites. A huge daylight-zone cavern descends along permanent heavy-duty guidelines to about 100 ft, with crystal-clear water, a famous compressor-fed air bell at 30 ft, and a resident softshell turtle named Virgil. Amenities include docks, staging decks, rental gear, fills and on-site lodging.

cavecenoteshore

Cavern overhead below ~30 ft (large daylight zone considered safe for open water divers, but staying above 60 ft recommended without cavern training); gets dark and silty toward the 100 ft bottom; gated cave section requires full cave certification; solo diving prohibited.

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