Agate Hunting on the Oregon Coast: Best Time, Rules, and Winter 2026–27 Windows

Winter is when the Oregon coast gives up its agates: storms strip the summer sand and uncover the gravel where they hide, and state rules let you keep a gallon a day. The scarce ingredient is light. In December 2026, Port Orford (NOAA station 9431647) gets 9 minus tides with at least 30 daylight minutes in their window, Newport (9435380) just 5 — and across the October 2026–March 2027 king-tide season, each station's five deepest such lows all land between 5:04 and 6:25 PM, nine of the ten after sunset. Deepest on that shortlist: −2.21 ft at Port Orford, December 24, about 85 minutes after sunset.

Why is winter the best time to find agates?

The agates themselves are old news — banded chalcedony, formed millions of years ago in volcanic rock. What changes is the beach on top of them. Travel Oregon's agate guide relays the collector's case with a hedge: some argue the best time to find them is when winter wind scours the beaches, the loss of sand "revealing layers of rocks anytime from December to March." Collector lore adds the corollary: go soon after a big blow, before the next crowd and the next sand movement, and walk the freshly exposed gravel while it's still wet enough to make the translucent stones glow.

Where to look is less mysterious than it sounds. Travel Oregon's list includes South Beach State Park at Newport, home of the "Newport Blues," a dark-gray local agate — and, conveniently for us, next door to the NOAA gauge (9435380) this site uses for Newport predictions. On the south coast, their picks run to Whiskey Run Beach and Otter Point. Our Port Orford station page tracks Battle Rock Beach, Rocky Point, and a local Agate Beach of its own.

What does Oregon let you keep?

The ocean shore is a state recreation area, and collecting is regulated by rule OAR 736-021-0090. The numbers worth memorizing:

• Agates, shells, stones, fossils (non-living, loose on the ground): up to a one-gallon container per person per day, and three gallons per person per calendar year.
• Each person must use an individual container — you can't pool a family's finds into one bucket.
• Cobble has its own line: five gallons per day, ten per year. Sand: five per day, twenty per year.
• More than that requires a special-use permit from Oregon Parks and Recreation.

A gallon of agates is a genuinely heavy day. Most hunters never brush the limit; the rule exists so the gravel is still there next winter.

Where do the winter 2026–27 minus-tide windows land?

For the regional comparison, the Oregon coast king tides 2026–27 guide separates the official high-water photo dates from low-tide windows and explains why daylight overlap does not mean daylight at the low.

Here is the collision at the heart of winter agate hunting: the season that exposes the gravel is the season that hides the tide. Minus tides keep arriving all winter, but the ones with usable light get scarce, and on the Oregon coast the lows themselves migrate past sunset. Across the king-tide season (October 2026 through March 2027), the five deepest lows at each station whose window holds at least 30 minutes of daylight all bottom out between 5:04 and 6:25 PM — nine of the ten after sunset — and nothing from February or March makes either top five. The depth is front-loaded into late November through late January.

Port Orford, NOAA station 9431647:

Newport (South Beach), NOAA station 9435380:

Five deepest lows with ≥30 daylight minutes in the window, Oct 2026–Mar 2027 king-tide season at each station, computed 2026-07-03 and re-verified 2026-10-04 from NOAA station 9431647 and 9435380 predictions. "Low vs sunset" compares the predicted low to that day's local sunset; "daylight in window" counts sunlit minutes anywhere in the window, not light at the low.

Read the sunset column before the depth column. At Newport on November 24, the window spans four and a half hours but holds only 46 daylight minutes — all at the front, before an early-winter sunset — so the 6:04 PM low itself arrives in the dark. In summer the deepest water and the light coincide; in winter they don't, and the sunlit minutes sit at the start of the window while the tide is still falling. Plan around that daylight column, not the low time — and treat it as what it is, daylight arithmetic on station predictions, not a statement about beach access, parking, or how long your particular walk back takes. The best light-to-depth trade on this shortlist is Port Orford on January 21, 2027: −1.89 ft about five minutes before sunset, 152 daylight minutes, and the only low in the tables above that arrives before dark — also the only Great-band window among the ten. If you're picking one trip, that's the Trip Picker's kind of answer, and the 2026–27 king tide calendar has the rest of the season's dates.

Do you actually need a minus tide?

For agates, honestly, no — and the monthly counts show why the question matters. Minus tides whose window holds at least 30 daylight minutes, by month:

Minus tides with ≥30 daylight minutes in their modeled window, per month, computed 2026-10-04 from NOAA station 9431647 and 9435380 predictions. In summer the low itself is usually in daylight; in the winter months most of these lows fall after sunset.

Summer drowned in good tides: Port Orford's July best was −2.46 ft at 6:37 AM with 217 daylight minutes (score 90, Exceptional), and Newport's deepest was −2.52 ft with 285 — morning lows, fully lit. But July gravel is buried gravel. Winter flips it — the sand leaves, and the deep lows slide past sunset. Newport's deepest winter shortlist low (−1.91 ft, 73 minutes after sunset) gives up 0.61 ft to its summer best; Port Orford's (−2.21 ft, 85 minutes after sunset) gives up only 0.25 ft. The southern station keeps more of its depth in the dark months, one reason it punches above its size for winter beachcombing.

So the strategy is a two-key lock. Storm first: that's weather, watch the forecast. Tide second: any low you can see helps, a minus low helps most, and the tables above are the winter shortlist. The Tide Window Finder recomputes the list any day you like, and the year heatmap shows the whole seasonal shape at a glance — including that September trough, when Port Orford managed just 3 qualifying minus tides all month.

What about the ocean at your back?

Post-storm beaches earn their reputation for surprises, and the state's own guidance is blunt. Travel Oregon's agate guide: "Never turn your back to the ocean, watch for sneaker waves" — and it warns how easy it is to get lost in the search and miss one coming. What Is a Sneaker Wave? collects the National Weather Service's definition and watch-the-ocean guidance, plus the wave science behind that warning. On a dusk window that goes double: the daylight minutes in the tables above end before the window does, so plan your walk back while the beach is still lit. The flood tide doesn't wait for you to finish sorting pebbles.

One gallon, one bucket per person, eyes on the water. The gravel does the rest. For the summer counterpart to this calendar — those 90-point July mornings — see the Newport station page, or the best Oregon tide pools guide for how the coast's four stations split the year.