Two New Right Whale Slow Zones: Southwest of Nantucket, MA and Southwest of Martha's Vineyard, MA
Effective through April 8
On March 24, 2026, the Martha’s Vineyard buoy operated by the Woods Hole Oceanographic Institution detected the presence of right whales southwest of Nantucket, MA. Additionally, the NOAA North Atlantic Right Whale Sighting Survey detected the presence of right whales southwest of Martha's Vineyard, MA. The right whale Slow Zones are in effect through April 8, 2026.
As a reminder, five additional Slow Zones are also currently in effect in the Northeast/Mid-Atlantic region. Locations and effective dates are listed below. There are also Slow Zones currently active in the Southeast Region. Visit the Right Whale Slow Zones and Dynamic Management Areas website for a full list of active Slow Zones.
Voluntary Right Whale “Slow Zone” Areas
Mariners are requested to avoid or transit at 10 knots or less inside the following Dynamic Management Areas and Slow Zones where endangered right whales have been detected. Vessel strikes are one of the primary causes of injury and death for right whales. Slower speeds are known to reduce the severity of impacts to whales when strikes occur and may provide boat and vessel operators an opportunity to avoid a collision. Visit our website for more information.
 Southwest of Martha's Vineyard, MA Slow Zone: Effective March 24 - April 8, 2026
Waters bounded by:
Northern Boundary: 41°00′ N
Southern Boundary: 40°26′ N
Eastern Boundary: 70°40′ W
Western Boundary: 71°21′ W
Southwest of Nantucket, MA #2 Slow Zone: Effective March 24 - April 8, 2026
Waters bounded by:
Northern Boundary: 41°15′ N
Southern Boundary: 40°45′ N
Eastern Boundary: 69°59′ W
Western Boundary: 70°40′ W
South of Nantucket, MA Slow Zone: Effective March 20 - April 4, 2026
Waters bounded by:
Northern Boundary: 40°55′ N
Southern Boundary: 40°21′ N
Eastern Boundary: 69°28′ W
Western Boundary: 70°24′ W
Southeast of Atlantic City, NJ Slow Zone: Effective March 16 - 31, 2026
Waters bounded by:
Northern Boundary: 39°21′ N
Southern Boundary: 38°50′ N
Eastern Boundary: 72°55′ W
Western Boundary: 73°34′ W
Southeast of Nantucket, MA Slow Zone: Effective March 15 - 30, 2026
Waters bounded by:
Northern Boundary: 40°56′ N
Southern Boundary: 40°23′ N
Eastern Boundary: 69°02′ W
Western Boundary: 69°43′ W
Northeast of Boston, MA Slow Zone: Effective March 13 - 28, 2026
Waters bounded by:
Northern Boundary: 42°43′ N
Southern Boundary: 42°13′ N
Eastern Boundary: 70°21′ W
Western Boundary: 71°02′ W
Southwest of Nantucket, MA #1 Slow Zone: Effective March 11 - 26, 2026
Waters bounded by:
Northern Boundary: 41°04′ N
Southern Boundary: 40°32′ N
Eastern Boundary: 70°08′ W
Western Boundary: 70°50′ W
Active Seasonal Management Areas
Mandatory speed restrictions of 10 knots or less (50 CFR 224.105) are in effect for most vessels 65 feet or longer in the following areas:
Mid-Atlantic: November 1-April 30
Southeast: November 15-April 15
Cape Cod Bay: January 1–May 15
Off Race Point SMA: March 1- April 30
NOTE: From March 1-April 30, Massachusetts state law requires all vessels, regardless of size, to adhere to the 10 knot speed limit within the Cape Cod Bay SMA.
North Atlantic right whales are on the move along the Atlantic coast of the United States. To protect right whales, regulations prohibit approaching or remaining within 500 yards (1,500 feet) of a right whale. That’s the length of about five football fields.
Endangered North Atlantic right whales remain highly vulnerable to extinction, as human impacts continue to threaten the survival of this species. There are approximately 380 individuals remaining, including about 70 reproductively active females.
In August 2017, NOAA Fisheries declared the increase in right whale mortalities an Unusual Mortality Event, which helps the agency direct additional scientific and financial resources to investigating, understanding, and reducing the mortalities. This work is done in partnership with the Marine Mammal Stranding Network, Canada’s Department of Fisheries and Oceans, and outside experts from the scientific research community.
All boaters from Maine to Florida, or interested parties, can sign up for email or text notifications about the latest Right Whale Slow Zones. You can also follow us on Facebook (@NOAAFisheriesNEMA) and X (@NOAAFish_GARFO and @NOAAFisheriesSE) for announcements.
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