Three clams, three different flats

The North Shore digs for three kinds of clam and each one lives somewhere different. Soft-shell clams, the ones you fry, hide in muddy sand just below the low-tide line. Quahogs sit in cleaner, firmer sand and get raked rather than dug. Razor clams stand upright in straight sandy beaches and pull straight down the second they feel you.

Once you know which clam you are after, you stop wandering random beaches and start reading the tide charts like a treasure map.

Licenses and rules that actually matter

Massachusetts requires a shellfish license for anyone digging, and towns issue their own on top of the state permit. Check the town's shellfish board before you go, because some flats are closed after heavy rain, some are "residents only," and a few rotate on a weekly schedule.

The other rule people forget is the limit. There is a legal minimum size for quahogs and a daily bushel cap, and wardens do check. Bring a measuring ring and a bucket you would not mind a warden inspecting.

Reading the tide

You dig on a falling tide, not a rising one. As the water pulls out it exposes the siphon holes, which look like tiny dimples or a little squirt of water when you step near them. On a rising tide those holes fill and the clams shut tight.

Aim for the two hours after peak high. That is when the flats are open enough to work and the clams have not yet retreated too deep.

Eating your catch

Soft-shell clams need a purge in clean salted water for a few hours to spit out their sand. Quahogs are happier straight into the pot. Razor clams are best barely steamed, which sounds fussy until you taste one cooked right.

Bring a cooler with ice on the drive home. Nothing ruins a good dig like a warm bucket in a hot car.