Lost Coast Trail in late March: storm windows, tides, and seal-pupping rules

Every Lost Coast itinerary is written by the tide table, and a late-March trip adds two more authors: spring storm systems and the harbor seal pupping season that starts in March. Get all three right and this is the best beach backpacking in California with a fraction of summer's competition for permits. The basics hold year-round. The trail runs 25 miles from Mattole Beach south to Black Sands Beach at Shelter Cove, permits come through a Recreation.gov reservation, hard-sided bear canisters are required, and groups cap at 15. Three separate tide-sensitive zones disappear under the ocean at high tide, so a printed tide chart and the ability to read it are as mandatory as the canister. Plan on 1 to 1.5 miles per hour over sand, cobbles, and boulders, which is the pace math that wrecks first-timers who plan trail-speed days. March specifics, in order of importance. First, weather: spring fronts move through fast, seas run dramatic, and the window between systems is when this trip shines, with green bluffs, running creeks everywhere, and wildflowers starting at Spanish Flat around mile 9. Watch the forecast and be flexible by a day or two on either end. Second, the pupping rule: no pets on the trail during harbor seal pupping season, March through June, so the dog stays home for this window, full stop. Third, wildlife timing is actually in your favor: Sea Lion Gulch at mile 4.7 is busy with seals and sea lions in March and April. A southbound three-nighter maps cleanly onto the landmarks. Day one from Mattole passes the decommissioned Punta Gorda Lighthouse at mile 2.4 and gets through the first tide-sensitive stretch to camp near Cooksie Creek at mile 6.8. Day two clears the second impassable zone to Randall Creek at mile 8.8 and pushes across Spanish Flat toward Big Flat at mile 16.6. Day three threads the final and longest tide-restricted section to Gitchell Creek at mile 21.4, leaving a short walk to Black Sands Beach on the last morning. Each of those tide zones gets crossed on a falling or low tide, which means some days start at odd hours. That is the trail's rhythm; fighting it is how people get trapped against cliffs. Water is the easy part in spring: creeks are plentiful and reliable, everything gets treated. Camp in designated areas or on the beach 100-plus feet from water, and fires are legal only on the beach below the high tide line. Bears here are genuinely bold beach patrollers, which is why the canister rule is hard-sided and non-negotiable. Logistics deserve respect. The trailheads are three hours of winding road from Eureka on the north end, the last gas is in Petrolia, and there is no overnight parking for multi-day trips at Mattole, so most parties park at Shelter Cove and shuttle to the start. No cell service exists for the length of the route. Common mistakes for this window: trusting a phone tide app with no paper backup, turning your back on the ocean in big spring swell (rogue waves are a listed killer here), packing for mileage instead of hours, and bringing the dog. The coast does not negotiate on any of these. — Compiled by the PermitSnag team from agency info, ranger updates, and public trip logs.