Least Terns — Sebastian, Florida

Least terns around Sebastian nest in two kinds of places: open sand near the beaches at the Sebastian Inlet, and flat gravel rooftops on commercial buildings in Sebastian and Vero Beach. The Florida Fish and Wildlife Conservation Commission (FWC) describes the least tern as the smallest tern in North America, a colony nester that lays its eggs in very shallow depressions on bare sand. In Indian River County much of that nesting has moved off the beach. A report on Indian River County shorebirds by the Pelican Island Audubon Society states that least terns, along with several other shorebirds and seabirds, have shifted to nesting on flat gravel rooftops in the county.

The birds are seasonal visitors to Sebastian. According to the FWC species profile, least terns return in early spring from wintering grounds in Latin America, pair up through courtship in which males offer small fish to prospective mates, and lay eggs from mid April in south Florida to the first of May in the north. Eggs hatch after 21 days, and the young do not begin to fly safely until about three weeks after leaving the nest. Sebastian Daily, summarizing FWC guidance in April 2024, gave the shorebird nesting season in Sebastian as March 1 through September 1.

The most specific record of where least terns have nested around Sebastian comes from rooftop surveys. In a column dated May 2012 and posted by the Pelican Island Audubon Society, the society reported that in 2010, the latest survey data then available, there were 59 breeding pairs of least terns on rooftops in Indian River County and none of the other rooftop nesting species. Only two sites were active in 2010, both in Vero Beach: Vero Bowl at 929 14th Lane and the Bealls and Office Depot building at 5950 20th Street.

Sebastian itself had lost its rooftop colonies by then. The same Pelican Island Audubon Society report lists four sites that were no longer active, two of them in Sebastian: the Publix at 9580 US 1 North and the Winn-Dixie at 995 Sebastian Boulevard. The other two inactive sites were in Vero Beach, a Walgreens on 20th Street and the Macy's at the Indian River Mall on Route 60, and two historic Vero Beach sites, a Lowe's and a Publix on 58th Avenue, were described as no longer suitable. No more recent public count of rooftop colonies in Sebastian was found in the sources reviewed for this page.

FWC statements carried by Sebastian Daily explain why roofs matter. In April 2021, Sebastian Daily reported FWC figures that more than 50 percent of Florida's least tern population relies on rooftops for nesting, and in April 2025 it reported that about 50 percent of the state's least terns now depend on rooftops. The Pelican Island Audubon Society cautioned that rooftops are not a long term answer in Indian River County, because flat gravel roofs are being replaced with metal or rubber roofs that are not conducive to nesting.

On the beach side, Sebastian Daily reported in March 2026, citing the FWC, that nesting dates differ by species and region, with some birds starting nest building in March or April near the beaches at the Sebastian Inlet. The FWC noted that shorebirds and seabirds can begin nesting as early as mid February in parts of the state, and that they nest in sandy scrapes where camouflaged hatchlings are vulnerable to human activity. The FWC least tern profile describes the same pattern for this species near Sebastian and elsewhere: nests in very shallow depressions on broad expanses of bare sand, which camouflage the eggs.

Published dates for the Sebastian nesting season vary by source and year. Sebastian Daily articles in April 2021 and April 2022 carried FWC statements that rooftop nesting runs from March through August near Sebastian. Articles in April 2024 and April 2025 gave the statewide season as February 15 to September 1, with most rooftop nesting between April and September, and the 2024 article gave the Sebastian season as March 1 through September 1. For building owners in Sebastian, the FWC advice in each of those articles is to schedule routine roof maintenance and nonemergency repairs outside the nesting months.

Least terns that nest around Sebastian carry several layers of legal protection. The FWC lists the species as a State-designated Threatened species under Florida's Endangered and Threatened Species Rule, notes that it is protected by the federal Migratory Bird Treaty Act, and records that it is federally listed as Endangered only in the Midwest and Great Plains states. Sebastian Daily, reporting FWC guidance in April 2021, noted that any harassment or harm to rooftop nesting birds, even unintentional, is considered take and is therefore unlawful.

FWC guidance published in Sebastian Daily for the beaches near the Sebastian Inlet sets out specific practices. The March 2026 article asks beachgoers to keep at least 300 feet from nesting birds, avoid walking through groups of birds, and check for Critical Wildlife Area closures, which can be established on beaches or coastal islands. A June 2022 article asked people near the Sebastian Inlet to stay out of posted areas, keep dogs at home or leashed on beaches where dogs are allowed, remove trash and gear before sunset, recycle fishing line at monofilament recycling stations, and keep personal fireworks off the beach.

For rooftop colonies, the FWC asks Sebastian building owners to delay routine maintenance and nonemergency repairs until after the nesting season and, when urgent repairs are required, to work with FWC regional shorebird biologists, according to Sebastian Daily in April 2024 and April 2025.

Organized shorebird monitoring in Indian River County dates at least to April 18, 2012, when the first introductory meeting of the Treasure Coast Shorebird Partnership was held, according to the Pelican Island Audubon Society. The meeting was hosted for the Florida Shorebird Alliance by the Indian River County sea turtle coordinator and the FWC shorebird partnership coordinator, with local, state and federal environmental agencies and several nonprofit organizations attending. The society pointed observers to the Florida Shorebird Database, the online monitoring database for nesting records.

Volunteer work in Indian River County covers both beaches and roofs. The Pelican Island Audubon Society described trained observers helping with beach and rooftop monitoring, posting and pre posting sites, educating the public, preventing disturbance, chick checking, and rescuing chicks, which often fall off rooftops, and noted that rooftop monitoring suits beginning birders. Sebastian Daily reported in April 2024 and April 2025 that the FWC was seeking volunteers to become Qualified Rooftop Monitors to track and protect rooftop nests.

The Pelican Island Audubon Society attributed the scarcity of recorded shorebird nesting in Indian River County to development of beaches and shorelines, beach raking, dune buggies, predation by crows, laughing gulls and raccoons, and disturbance by dogs. It wrote that birds perceive dogs as predators, and that dogs should be kept off the beach in sensitive bird areas, especially inlets, with any dog beach limited in size and leash laws strictly enforced in Indian River County.

The FWC species profile lists statewide threats that echo the Indian River County report: coastal development, human traffic on beaches, predators drawn by food and trash, mechanical raking, shoreline hardening, rising sea levels, stronger storms, and spring tides that can flood nests. The profile also notes that least terns respond quickly to improved habitat, such as removal of beach vegetation or the dumping of dredged sand.