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Shore entry

Corporation Beach

Massachusetts, United StatesDirections
Open Water suggested2–6 m (5–20 ft) depthShore entry7mm or semi-dry + hood typical

Corporation Beach at a glance

Corporation Beach is a shore dive site in Massachusetts, United States with depths of 1.5–6.1 m (5–20 ft). Typically most favorable Jul–Aug · from 3 years of archive data. Divers commonly see Sea robin, American lobster, and Hermit crab. Recent reports put the water around 13°C (56°F). Check the latest conditions and entry details before you go.

No window today· next: tomorrow 8:00–18:00 · favorable & moderate

Forecast for this hour · 10:00 · run 9 h ago
2.0 m (6.5 ft)waves — about two meters expected (waves — about seven feet expected)

Tap a factor for its source and model point · Forecast 13°C · seasonal avg 15°C ( · Forecast 56°F · seasonal avg 59°F)

Site hazards: Cold water year-round; site blows out and gets rough with any northerly wind (northern exposure); shallow depth means long surface swims at low tide; summer swimmer traffic.

Read the full hazards ↓

Dive windows this week

Smallest waves: Thu
FriNo window

1.8 m waves · 22 kn wind (6.0 ft waves · 22 kn wind)

Sat8:00–13:00 moderate, 13:00–17:00 favorable, 17:00–18:00 moderate

0.8 m waves · 8 kn wind (2.7 ft waves · 8 kn wind)

Sun8:00–18:00 favorable

0.4 m waves · 3 kn wind (1.2 ft waves · 3 kn wind)

Mon8:00–18:00 favorable

0.3 m waves · 8 kn wind (1.0 ft waves · 8 kn wind)

Tue8:00–9:00 moderate, 15:00–17:00 moderate, 17:00–18:00 favorable

1.1 m waves · 14 kn wind (3.7 ft waves · 14 kn wind)

Wed8:00–18:00 favorable

0.3 m waves · 5 kn wind (1.1 ft waves · 5 kn wind)

Thu8:00–18:00 favorable

0.2 m waves · 8 kn wind (0.6 ft waves · 8 kn wind)

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 6:34 · Sunrise 7:02 · Sunset 17:47 · some windows run past sunset

Source: Open-Meteo marine · model point 14 km from site · updated 23 Oct, 01:18 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Corporation Beach

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: American lobster, Hermit crab, Moon snail
Best time: Within an hour of high tide; calm days with no northerly wind; late spring through fall for warmest water, often excellent visibility for New England thanks to the white-sand bottom.

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, 32% of days have historically been favorable, water has typically been 5°C (42°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 24 knots
  2. February, 25% of days have historically been favorable, water has typically been 4°C (38°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 24 knots
  3. March, 29% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 24 knots
  4. April, 52% of days have historically been favorable, water has typically been 7°C (45°F), waves have typically been 1.0 m (3.3 ft), wind has typically been 20 knots
  5. May, 71% of days have historically been favorable, water has typically been 12°C (53°F), waves have typically been 0.9 m (2.9 ft), wind has typically been 18 knots
  6. June, 84% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 0.7 m (2.2 ft), wind has typically been 16 knots
  7. July, 86% of days have historically been favorable, water has typically been 21°C (70°F), waves have typically been 0.6 m (2.1 ft), wind has typically been 16 knots, historically most favorable
  8. August, 86% of days have historically been favorable, water has typically been 20°C (68°F), waves have typically been 0.7 m (2.2 ft), wind has typically been 15 knots, historically most favorable
  9. September, 80% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 0.8 m (2.7 ft), wind has typically been 16 knots
  10. October, 61% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 1.1 m (3.5 ft), wind has typically been 19 knots
  11. November, 32% of days have historically been favorable, water has typically been 11°C (52°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 23 knots
  12. December, 33% of days have historically been favorable, water has typically been 7°C (45°F), waves have typically been 1.4 m (4.5 ft), wind has typically been 23 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 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 July 2026

Site details

Corporation Beach in Dennis is widely regarded as Cape Cod's best shore dive: a classic white-sand Cape Cod Bay beach with a rock jetty at its left end. The dive area outside the jetty is a mix of medium rocks, boulders, sand, and eelgrass beds in no more than about 20 ft of water, and the bright sand bottom often gives the site unusually good visibility. Restrooms and a seasonal snack bar make it a good spot to bring non-diving family. Best dived within an hour of high tide on days without northerly wind.

reefshore

Cold water year-round; site blows out and gets rough with any northerly wind (northern exposure); shallow depth means long surface swims at low tide; summer swimmer traffic.

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