CALIFORNIA, Md. — Each spring and early summer, one of Maryland’s oldest wildlife traditions returns to beaches along the Chesapeake Bay and the Atlantic coast. Horseshoe crabs, animals that have existed for roughly 450 million years, come ashore to spawn during high tides. Their annual appearance offers residents and visitors a chance to witness a remarkable natural event while learning more about the health of the region’s coastal ecosystems.
The Maryland Department of Natural Resources (DNR) reported this month that the regional horseshoe crab population, once badly depleted, has recovered faster than scientists expected. For anyone interested in wildlife, photography or family-friendly outdoor activities, Maryland’s horseshoe crab beaches can provide a memorable experience. Knowing when and where to look, while giving the animals plenty of space, helps protect this important species for future generations.
Why Horseshoe Crabs Matter
Despite their name, horseshoe crabs are not true crabs. They are ancient marine animals with a hard shell, a long tail spine and blue blood that has become well known for its importance in medical research. Their blood is used to produce Limulus Amebocyte Lysate (LAL), a compound used to test injectable drugs and many medical devices for bacterial contamination, according to Maryland DNR.
Their ecological value is equally significant. A single female horseshoe crab can lay roughly 80,000 eggs in a season, with only about 1% surviving, according to the Chesapeake Bay Program. Many of the remaining eggs become an important food source for migrating shorebirds traveling along the Atlantic Flyway. Fish, juvenile loggerhead sea turtles — a threatened species — and other wildlife also benefit from the seasonal abundance of eggs, according to Maryland DNR.
Because horseshoe crabs connect marine life, coastal habitats and migratory birds, healthy spawning populations contribute to the overall balance of Chesapeake Bay ecosystems. Protecting their breeding habitat supports many other species that depend on the same shoreline environments.
Where To See Horseshoe Crabs In Maryland
Maryland offers several locations where horseshoe crabs may be observed during their spawning season. Sandy shorelines along the Chesapeake Bay and portions of the state’s Atlantic coastline can attract large numbers during favorable tides.
Some public beaches, state parks and wildlife management areas provide opportunities for viewing:
- Flag Ponds Nature Park, Calvert County — The Chesapeake Bay Program says the park’s sandy beaches, protected coves and shallow shoreline provide ideal spawning habitat, with activity commonly observed during peak tides in May and June. Naturalist Kimberly Curren of the Calvert Nature Society has described the event as something that “only happens for a few weeks every year.”
- Assateague State Park and Skimmer Island, Worcester County — Maryland DNR biologists conduct annual spawning surveys at Assateague beach, Skimmer Island and southern Ocean City as part of the state’s coastal bays monitoring program.
- Point Lookout State Park, St. Mary’s County — Located where the Potomac River meets the Chesapeake Bay, Point Lookout offers shoreline access in a region where horseshoe crabs may be observed during the spawning season.
- Other Chesapeake Bay and coastal bay shorelines — Maryland DNR encourages anyone who observes spawning activity along Bay or coastal bay shorelines to report the location, helping the department document spawning habitat statewide.
Visitors should check local park rules before planning a trip, as some areas may have seasonal access restrictions or conservation measures designed to protect wildlife.
When To Visit
The best opportunities generally occur during the spawning season from May through July, especially around evening or nighttime high tides associated with the full and new moons. In the Chesapeake Bay, spawning usually begins in late May, according to Maryland DNR.
Nature is unpredictable, however. Weather, water conditions and tides all influence when horseshoe crabs come ashore. Even if only a few animals are visible, visitors can still observe tracks in the sand or signs of recent spawning.
Checking local tide forecasts before heading to the beach can improve the chances of seeing horseshoe crabs while avoiding unnecessary disturbance to the animals.
How To Watch Responsibly
Watching horseshoe crabs is most rewarding when visitors give wildlife enough room to behave naturally.
Avoid unnecessary handling. If you encounter an overturned horseshoe crab, it may be gently turned right-side up by carefully grasping the edge of its shell — never by the tail, which the animal uses to right itself. Follow any posted guidance from park staff or wildlife agencies. If you notice a tagged horseshoe crab, Maryland DNR says there is no need to remove the tag; simply report the tag number through the U.S. Fish and Wildlife Service’s resighting form to support ongoing population research.
Simple steps can help protect spawning beaches:
- Stay on designated access paths whenever possible.
- Watch from a respectful distance.
- Avoid shining bright lights directly on spawning animals at night.
- Leave eggs, shells and wildlife undisturbed.
- Keep pets under control and follow local leash rules.
- Carry out all trash before leaving the beach.
- Report spawning sightings, with GPS coordinates if possible, to Maryland DNR to help document habitat statewide.
These actions help reduce stress on wildlife and preserve sensitive shoreline habitat.
Conservation Continues To Matter
Although horseshoe crabs have survived for hundreds of millions of years, they still face modern challenges. Maryland DNR reports that coastwide horseshoe crab landings increased nearly 600% between 1990 and 1997 due to overharvesting, contributing to a population decline that lasted from the 1990s through roughly 2005 and remained low until about 2010. Red knot shorebird sightings, closely tied to the availability of horseshoe crab eggs, fell from about 50,000 birds in the late 1990s to roughly 25,000 a decade later.
In response, Maryland, Delaware, New Jersey and Virginia began implementing protections starting in 1998, including a moratorium on commercial harvest in New Jersey and a ban on harvesting female horseshoe crabs in Maryland, Delaware and Virginia. Those measures appear to be working. Maryland DNR says a recent regional stock assessment found the population had, by 2023, recovered to levels comparable to — or possibly exceeding — those seen in 1990, with an estimated 16 million adult females and 40 million adult males.
“When the population did recover, it did at a faster rate than we expected,” Maryland DNR biologist Steve Doctor, who leads the state’s monitoring program, said in the department’s July 2026 announcement.
Maryland residents can contribute by respecting wildlife, participating in beach cleanups, reporting spawning sightings to DNR and supporting conservation efforts that protect the Chesapeake Bay. Even small actions, such as avoiding disturbance during spawning season, can make a difference.
The annual return of horseshoe crabs is more than a seasonal curiosity. It is a reminder that Maryland’s coast remains home to wildlife with deep connections to the Chesapeake Bay’s ecological health. Whether visiting a quiet beach in Southern Maryland or exploring another stretch of the state’s shoreline, watching these ancient animals can provide a greater appreciation for one of the region’s most enduring natural events.
Frequently Asked Questions
When is the best time to see horseshoe crabs in Maryland?
The best opportunities are generally during the spawning season from May through July, especially around high tides associated with the full and new moons. Maryland DNR says spawning in the Chesapeake Bay usually begins in late May, with evening and nighttime visits often providing the greatest chance of seeing spawning activity.
Can I touch or move a horseshoe crab?
Avoid unnecessary handling. If a horseshoe crab is overturned, it may be gently turned over by the edge of its shell, but never pick it up by the tail. If you see a tagged crab, Maryland DNR says there is no need to remove the tag — simply report it. Follow guidance from park staff or wildlife agencies whenever possible.
Why are horseshoe crabs important to the Chesapeake Bay?
Their eggs provide food for migrating shorebirds and other wildlife, including threatened loggerhead sea turtles, making horseshoe crabs an important part of coastal food webs and healthy Bay ecosystems. Their blue blood is also used in medical testing for bacterial contamination.
Where can families look for horseshoe crabs in Maryland?
Flag Ponds Nature Park in Calvert County, Assateague State Park and Skimmer Island in Worcester County, and shorelines around Point Lookout State Park in St. Mary’s County are among the places where horseshoe crabs may be observed during the spawning season. Always check local park rules before visiting.
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