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Map of Sea Fan Grotto (White Rocks, Catalina Island)
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Boat entry

Sea Fan Grotto (White Rocks, Catalina Island)

California, United States
Open Water suggested3–18 m (10–60 ft) depthBoat entry3mm wetsuit typical

Boat dive — see Entry & access.

Sea Fan Grotto (White Rocks, Catalina Island) at a glance

Sea Fan Grotto (White Rocks, Catalina Island) is a boat dive site in California, United States with depths of 3–18.3 m (10–60 ft). Typically most favorable Jul–Aug · from 3 years of archive data. Divers commonly see Golden gorgonian sea fans, Blacksmith, and Garibaldi. Recent reports put the water around 23°C (73°F). Check the latest conditions and entry details before you go.

Next window today· 8:00–19:00 · favorable · sunset 18:07

Forecast for this hour · 2:00 · run 16 h ago
0.9 m (2.9 ft)waves — under a meter expected (waves — about three feet expected)

Tap a factor for its source and model point · Forecast 23°C · seasonal avg 20°C ( · Forecast 73°F · seasonal avg 67°F)

Site hazards: Surge inside the cavern on swell days, overhead environment for those entering the grotto, shallow rocks close to the cliff

Read the full hazards ↓

Dive windows this week

Mon8:00–19:00 favorable

1.0 m waves · 9 kn wind (3.4 ft waves · 9 kn wind)

Tue8:00–19:00 favorable

1.3 m waves · 5 kn wind (4.3 ft waves · 5 kn wind)

Wed8:00–19:00 favorable

1.2 m waves · 4 kn wind (3.8 ft waves · 4 kn wind)

Thu8:00–19:00 favorable

1.0 m waves · 6 kn wind (3.2 ft waves · 6 kn wind)

Fri8:00–19:00 favorable

1.0 m waves · 5 kn wind (3.1 ft waves · 5 kn wind)

Sat8:00–19:00 favorable

0.9 m waves · 6 kn wind (3.1 ft waves · 6 kn wind)

SunNot in the forecast yet

Favorable windowModerate window— no window

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

First light 6:42 · Sunrise 7:07 · Sunset 18:07 · some windows run past sunset

Source: Open-Meteo marine · model point 11 km from site · updated 25 Oct, 10:25 GMT-7

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Sea Fan Grotto (White Rocks, Catalina Island)

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

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: Golden gorgonian sea fans, Blacksmith, Garibaldi
Best time: Calm days with minimal swell; visibility averages 30-40 ft, often 60+

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, 62% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 1.6 m (5.1 ft), wind has typically been 11 knots
  2. February, 60% of days have historically been favorable, water has typically been 15°C (58°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 12 knots
  3. March, 57% of days have historically been favorable, water has typically been 14°C (58°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 13 knots
  4. April, 83% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 1.3 m (4.2 ft), wind has typically been 11 knots
  5. May, 89% of days have historically been favorable, water has typically been 17°C (62°F), waves have typically been 1.2 m (3.8 ft), wind has typically been 11 knots
  6. June, 98% of days have historically been favorable, water has typically been 19°C (66°F), waves have typically been 1.1 m (3.5 ft), wind has typically been 10 knots
  7. July, 100% of days have historically been favorable, water has typically been 21°C (69°F), waves have typically been 1.0 m (3.1 ft), wind has typically been 10 knots, historically most favorable
  8. August, 100% of days have historically been favorable, water has typically been 21°C (70°F), waves have typically been 1.0 m (3.1 ft), wind has typically been 10 knots, historically most favorable
  9. September, 99% of days have historically been favorable, water has typically been 21°C (70°F), waves have typically been 1.0 m (3.2 ft), wind has typically been 10 knots
  10. October, 87% of days have historically been favorable, water has typically been 20°C (67°F), waves have typically been 1.2 m (3.8 ft), wind has typically been 10 knots
  11. November, 84% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 1.2 m (4.0 ft), wind has typically been 9 knots
  12. December, 72% of days have historically been favorable, water has typically been 16°C (61°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 8 knots

July and August have 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 recorded at this site, by month

Recorded observations — evidence of past sightings, 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.

  • Heterodontus francisci recorded here Dec (1 record)

    most recent 2012

  • Hypsypops rubicundus recorded here Dec (1 record)

    most recent 2012

  • Panulirus interruptus recorded here Dec (1 record)

    most recent 2012

  • Scorpaena guttata recorded here Dec (1 record)

    most recent 2012

Newest record here: 2012. Counts are occurrence records near this site from public biodiversity datasets (GBIF), grouped by calendar month across all sampled years. Sightings vary — past records are context, not a prediction.

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 July 2026

Site details

A classic Catalina boat dive just east of Blue Cavern Point where massive rock slabs form a wide-mouthed cavern in about 25 ft of water, famous for 'hanging gardens' of golden gorgonian sea fans on its ceiling and walls. The cavern extends roughly 20 ft back with a chimney exit rising to 10 ft, and natural light is always visible; kelp reef outside slopes deeper for a longer dive. Lies along the Blue Cavern Onshore SMCA shoreline, so take is prohibited.

boatcavereef

Surge inside the cavern on swell days, overhead environment for those entering the grotto, shallow rocks close to the cliff

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