Moclips

Yes. Washington's ocean beaches below the high tide line are public, and picking up loose agate and jasper pebbles in reasonable personal quantities is generally accepted along this stretch. The beach is within the Seashore Conservation Area, so check the Mocrocks stretch rules, and stay south of the Quinault Indian Nation boundary.

November through March, on a falling tide. Winter storms strip sand and expose the gravel lenses where agates concentrate, effectively restocking the beach each season. Arrive about two hours before low tide and work the water down, because wet gravel is far easier to read than dry.

Agate, jasper and chalcedony pebbles, with occasional petrified wood. All of it arrives as rounded beach material transported and polished by surf rather than in place in bedrock, and it concentrates in gravel lenses that shift position as storms move sand along the shore.

Look for translucency rather than colour. Hold a candidate pebble up against the light: agate glows where ordinary quartz and basalt pebbles stay opaque. Search the wet zone near the tideline, carry a spray bottle for checking dry pebbles higher up, and wear polarised sunglasses to cut glare.

The searching is easy, flat walking that suits beginners, but the Washington coast demands respect. Sneaker waves are a real hazard, drift logs roll in the swash, and winter beachcombing means cold, wind and short daylight. Check tides before you go and never turn your back on the surf.

A Washington designation covering the state's ocean beaches, managed to keep them public while regulating uses such as vehicle access and razor clam harvest. Moclips sits within the Mocrocks stretch of it, which has its own seasonal rules worth checking before a visit.

Some Washington coastal beaches permit vehicle driving on the sand in designated seasons and areas while others do not, so check current rules for the Mocrocks stretch rather than assuming. Soft sand strands vehicles regularly on this coast, and a stuck car on a rising tide is a serious problem.

Translucency. Agate is chalcedony that transmits light, so it glows when held against the sky, while jasper is opaque chalcedony coloured by iron and other impurities. Both occur at Moclips, and the field test is the same for each: wet the pebble and hold it up to the light.

Yes, and the Mocrocks stretch is a popular razor clam beach with seasons set by Washington Department of Fish and Wildlife. Digs bring crowds and additional rules to the beach, so check the schedule if you want a quiet day of beachcombing or are planning to search at low tide.

Historically that is exactly what it was known as, dating from the era when the Northern Pacific railroad brought resort visitors to the Washington coast at the turn of the twentieth century. The agates are still there, concentrated in gravel lenses that storms expose and bury through the year.

Winter, almost unanimously, and specifically on a falling tide after a storm. The reasoning people give is that summer sand buries the gravel lenses where agates concentrate, while winter storms strip that sand away and effectively restock the beach each season. The practical advice attached to it is to arrive around two hours before low tide and work the water down, dressing for cold and rain rather than for the forecast.

The test people describe is backlighting rather than surface appearance: hold the pebble up against the sky and look for light transmitting through it, since agate glows where basalt and most quartz pebbles stay opaque or milky. Collectors also mention the waxy surface lustre and conchoidal fracture as secondary clues, and note that polarised sunglasses help enormously by cutting glare on wet gravel.