Short answer: Dartmouth is not a rock-pooling town — the beaches are shingle and the coves are down steep steps. Sugary Cove near the castle is the easiest option. For proper pools, drive round to Brixham or Torbay, about forty minutes.
This is a river town with a working quay, and the beaches near it are shingle rather than rocky. Blackpool Sands, the family beach fifteen minutes west, is fine shingle with a boardwalk — excellent for a beach day and not a rock-pooling beach. Strete Gate is a long pebble bank.
There is rock pooling to be had, but it takes a bit of finding, and the best of it is a drive away.
The most accessible option — a small shingle cove three minutes' walk from Dartmouth Castle, or about half an hour on foot from town. Clear warm water, uneven rocky ground getting in and out, and enough structure to poke about in. Reviewers note it goes into shade quickly after mid-afternoon in late summer, so go earlier.
Further along the coast path south of the castle, down a long flight of wooden steps. Clear water, no rocks underfoot in the water itself, and no facilities of any kind. It is a walk with a swim at the end rather than a rock-pooling trip with children — but older ones will enjoy the scramble.
Rock pooling only works on a falling tide. Aim to arrive about two hours before low water and work outwards as the sea drops — that way the pools furthest out, which nobody has disturbed, are the ones you reach last. Check the tide table before you set off rather than guessing.
If the children want water and creatures rather than rock pools specifically, crabbing off the quay in town is the better use of a morning here — sheltered river water, walls to sit on, and the ferries going past.
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