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How to read tides and beach flags before you let the dog run

Before the run

How to read tides and beach flags before you let the dog run

On the days Cape Ann's beaches are open to dogs there is nobody in a tower watching the water. The tide table and the surf forecast are your lifeguard, and reading them takes five minutes the night before. This is how to do it, and where it matters most.

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Trainer and puppy working on a long line at the beach

Last reviewed September 26, 2026 · by the Dogtown team

What you need

What you need: a tide table, the surf forecast and a long line

Three sources and one piece of gear. The tide table for Gloucester Harbor, which any tide app gives you a week ahead, tells you the time of low water and how big the swing is. The National Weather Service in Boston publishes a surf zone forecast and a rip current outlook for the coast; read it the same way you read the rain forecast. And the wind: an onshore wind from the east or northeast builds surf on the beaches that face open water, and a nor'easter's swell lingers for two days after the wind drops.

The gear is a long line, thirty feet of light webbing clipped to a harness, so that the first ten minutes on any beach happen with the dog attached to you while you both read the water. A dog does not need to be off leash to enjoy the beach, and on Rockport's beaches it needs a leash or direct voice control in any case.

The tide table for Gloucester Harbor, read the night before
The NWS surf and rip current forecast
The wind direction: east means surf
A thirty-foot long line and a harness
The town's dog-day rule for that beach and that date

A Dogtown trainer rewarding a puppy with food during a beach session in Gloucester.

The method

The method: falling tide, forecast, flags, then the waterline on leash

Plan to arrive two hours before low water. A falling tide gives you the widest, hardest sand, the fewest surprises and time to get back; a rising tide fills the channels behind you. On the way, note the wind. At the car park, look for flags. Most days from October to April there will be none, because the guards are gone; if there are, they follow the common beach flag system and they overrule your plan.

Then read the water yourself. A rip current shows as a gap in the line of breaking waves, a channel of darker, choppier water, or a streak of sand-coloured water running out to sea. Waves that dump straight down on the sand rather than rolling in are a sign of a steep bank and a strong backwash. Walk the whole stretch on the long line before you consider letting go, and set the boundary at the wet sand, not the water.

01
The night before: tide table, time of low water, size of the swing.
02
The night before: the NWS surf zone forecast and the wind direction for the morning.
03
On arrival: any flag flying, read and obeyed; no flag means no guard and no help.
04
At the waterline, on the long line: look for rips, dumping waves and the drop-off at the bank.
05
Set the rule for the day, wet sand only, paddling to the knees, or no water, and keep it.
06
Watch the turn of the tide and be back at the car before the channels fill.
07
Leave when the calendar says: even days at Good Harbor, odd at Wingaersheek, and nothing at Good Harbor from April 1.

Flag	Meaning	With a dog
Green	Low hazard	Long line first, then the day's rule
Yellow	Medium hazard, moderate surf or currents	Wet sand only, no fetch into the water
Red	High hazard, strong surf or currents	Leash on, walk the dry sand
Double red	Water closed to the public	Leash on, stay above the tide line
Purple	Dangerous marine life	Leash on, no water, no sniffing the wrack line

Where it goes wrong

Where it goes wrong: the sandbar, the fetch into surf and the cold

The classic Cape Ann mistake is the sandbar. At low water the bar from Good Harbor out to Salt Island is a walk, and people and dogs go out on it; the tide comes back around both sides, and the walk back becomes a swim in a channel with a current. The same happens on the flats at Wingaersheek towards the mouth of the Annisquam, where the river channel runs fast on a falling tide. Watch the clock, not the sand.

The second is fetch into surf. A dog that will chase a ball into any water will chase it into a rip, and a dog in a rip cannot be rescued by an owner in a rip. Throw along the beach, never out. The third is the water temperature: from November to April the sea here is cold enough that a wet dog in an onshore wind is shivering within minutes. The last is the gull chase, which ends with a small dog a long way out with no plan for coming back.

Sandbars are for the falling tide only
Throw along the beach, never into the water
Cold water and wind: dry the dog before the walk back
A rip is a current, not a wave; do not go in after the dog

The Cape Ann version

The Cape Ann version: which beach, which day, which tide

Every beach here has a date rule before it has a tide rule. Gloucester allows dogs from October 1 to April 30, Good Harbor on even-numbered days only and closed to dogs from April 1 for the piping plovers, Wingaersheek on odd-numbered days, Plum Cove and Cressy in the off-season. Rockport bans dogs from its public beaches from June 1 to September 15 and asks for a leash or direct voice control otherwise. Singing Beach takes licensed, vaccinated dogs from October 15 to April 14 with a walk-on fee while staff are on duty and two dogs per person, and Crane Beach in Ipswich takes leashed dogs from October 1 to March 31. All of that is at the time of writing; the town pages have the current version.

Then the tide. Good Harbor and Long Beach face open water and take the easterly swell first, so an east wind means dumping surf there while Wingaersheek, tucked inside the mouth of the Annisquam, is flat but running with current. Plum Cove is small and sheltered and the easiest place to teach a young dog about water. Pick the beach for the forecast, not just for the date.

A Dogtown trainer with a puppy and an adult dog on a Gloucester beach.

When to hand it to us

When to hand it to us: recall on a long line, and a pool when the beach says no

A dog you can call off a gull is a dog you can take to the beach. Our trainers teach recall on the beach on legal days, on a long line first, inside Bright Beginnings, Calm & Connected and Adventure Academy, from $94 per session, and our how-to on recall with a long line walks through the home version. A dog that has not yet passed that test stays on the line, and there is no shame in a whole winter of long-line beach walks.

On the days the forecast or the calendar says no, the water is at 210 Eastern Ave: splash pools and platforms on the turf yard, indoor play floors when it is too cold, and groups of 7 to 10 dogs matched by size. A full day is $42, a half day $33, and the free evaluation on a weekday morning between 6:30 and 9:30 AM comes first. The Pup Van collects for $10 each way in Rockport, Gloucester, Essex and Manchester-by-the-Sea, which on a red-flag morning is the better drive.

Recall on a long line before any off-leash beach
Pools on the turf when the forecast says no
The evaluation first, on a weekday morning

At Dogtown

Water without the tide

Splash pools on the turf, indoor floors when the shore is closed, and a van that gets a dog there on a red-flag morning.

Husky standing on the turf play yard at Dogtown, looking at the camera

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Dogtown walker and dog on a coastal trail at sunrise in Gloucester

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Pick-up & drop-off

The Pup Van comes to you.

Pup Van pick-up and drop-off is available for $10 each way in the Rockport, Gloucester, Essex and Manchester-by-the-Sea area. Not in the area? Ask us for pricing.

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Asked and answered

Questions people ask about this

Short, complete answers you can act on today. More in the full FAQ.

What do the beach flags mean?

In the common US system, green is low hazard, yellow is medium hazard with moderate surf or currents, red is high hazard, double red means the water is closed, and purple means dangerous marine life. On Cape Ann's off-season dog days the guards are gone and flags are usually not flying, so the surf forecast and your own eyes take over.

What is the best tide for walking a dog on the beach?

A falling tide, arriving about two hours before low water. You get the widest, firmest sand, the calmest water at the edge and time to walk back before the channels behind you fill. A rising tide is the one that cuts off sandbars and flats, so if you can only go on a rising tide, stay near the access point.

Can my dog swim at Good Harbor in winter?

Legally, on even-numbered days from October 1 to March 31, with the beach closed to dogs from April 1 for the plovers. Practically, the water from November onward is cold enough to matter and the easterly swell builds surf there first. Paddling at the edge on a calm day is fine; fetch into the surf is not.

How do I spot a rip current from the beach?

Look for a gap in the line of breaking waves, a channel of darker or choppier water running out to sea, or a streak of foam or sandy water heading away from the beach. The NWS Boston forecast tells you when rips are likely. If you see one, the dog stays on the long line and the ball stays in your pocket.

What if my dog gets caught in a current?

Do not go in after it. Move along the beach in the direction the current runs, keep calling in a bright voice so the dog swims at an angle back to shore, and dial 911 if the dog is out of reach. Most dogs swim out of a rip once they stop fighting it; most people who swim in after them do not.