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Shore entry

Fort Stark

New Hampshire, United StatesDirections
Open Water suggested5–8 m (15–25 ft) depthShore entry7mm or semi-dry + hood typical

Fort Stark at a glance

Fort Stark is a shore dive site in New Hampshire, United States with depths of 4.6–7.6 m (15–25 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Rock crab, Cunner, and Winter flounder. Recent reports put the water around 14°C (58°F). Check the latest conditions and entry details before you go.

Next window today· 8:00–18:00 · favorable · sunset 17:41

Forecast for this hour · 7:00 · run 6 h ago
0.7 m (2.3 ft)waves — under a meter expected (waves — about two feet expected)

Tap a factor for its source and model point · Forecast 14°C · seasonal avg 14°C ( · Forecast 58°F · seasonal avg 58°F)

Site hazards: Too shallow at low tide, slippery rocks, occasional fishing line

Read the full hazards ↓

Dive windows this week

Lightest wind: Sat
Tue8:00–18:00 favorable

0.6 m waves · 6 kn wind (2.0 ft waves · 6 kn wind)

Wed8:00–18:00 favorable

0.5 m waves · 6 kn wind (1.5 ft waves · 6 kn wind)

Thu8:00–18:00 favorable

0.4 m waves · 9 kn wind (1.3 ft waves · 9 kn wind)

Fri8:00–18:00 favorable

0.3 m waves · 10 kn wind (1.1 ft waves · 10 kn wind)

Sat8:00–18:00 favorable

0.2 m waves · 4 kn wind (0.7 ft waves · 4 kn wind)

Sun8:00–18:00 favorable

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

Mon8:00–11:00 moderate, 11:00–18:00 favorable

0.5 m waves · 6 kn wind (1.5 ft waves · 6 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 6:42 · Sunrise 7:11 · Sunset 17:41 · some windows run past sunset

Source: Open-Meteo marine · model point 11 km from site · updated 27 Oct, 01:19 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Fort Stark

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: Rock crab, Cunner, American lobster
Best time: High tide, calm seas, summer through fall

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, 45% of days have historically been favorable, water has typically been 6°C (42°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 22 knots
  2. February, 32% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 22 knots
  3. March, 31% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 21 knots
  4. April, 59% of days have historically been favorable, water has typically been 6°C (43°F), waves have typically been 1.2 m (3.9 ft), wind has typically been 19 knots
  5. May, 68% of days have historically been favorable, water has typically been 11°C (51°F), waves have typically been 1.1 m (3.5 ft), wind has typically been 17 knots
  6. June, 86% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 0.8 m (2.6 ft), wind has typically been 16 knots
  7. July, 87% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 0.8 m (2.6 ft), wind has typically been 16 knots, historically most favorable
  8. August, 85% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 0.9 m (2.8 ft), wind has typically been 15 knots
  9. September, 76% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.1 m (3.6 ft), wind has typically been 15 knots
  10. October, 57% of days have historically been favorable, water has typically been 14°C (58°F), waves have typically been 1.2 m (4.1 ft), wind has typically been 18 knots
  11. November, 51% of days have historically been favorable, water has typically been 11°C (52°F), waves have typically been 1.1 m (3.6 ft), wind has typically been 21 knots
  12. December, 38% of days have historically been favorable, water has typically been 8°C (46°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 22 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 July 2026

Site details

A historic coastal defense site on the southeast corner of New Castle Island at the mouth of the Piscataqua River, now a state historic site with a sheltered cobble beach entry. The bottom is small boulders with kelp and rockweed giving way to eelgrass in 15-25 feet of water, with little current, making it one of the friendliest novice ocean dives on New Hampshire's short coast.

shore

Too shallow at low tide, slippery rocks, occasional fishing line

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