🌤 Weather at Selden Neck State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 31–65 °F | 58–80 °F | 37–74 °F | 23–44 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Groton New London Airport, 19 mi away, elevation 10 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
Selden Neck State Park is a public state park in Connecticut near Lyme in New London County. Spanning 607 acres and established in 1917, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | Connecticut |
| Nearest City | Lyme |
| County | New London |
| Park Size | 607 acres |
| Established | 1917 |
| Google Rating | ⭐ 4.4/5 (350 reviews) |
Location & Getting There
Selden Neck State Park is located near Lyme, Connecticut. The park’s coordinates are 41.3961, -72.4094.
Things to Do
Connecticut’s compact state park system packs diverse experiences into a small state — from Long Island Sound beaches and tidal marshes to Appalachian ridgeline trails, glacial lakes, and cascading waterfalls. Activities include swimming at supervised lake and ocean beaches, hiking along the Blue-Blazed Trail system that connects many state parks, fishing in stocked trout streams and coastal waters, camping in forested settings, biking rail-trails and park roads, nature study at wildlife management areas, rock climbing at Ragged Mountain, kayaking coastal estuaries, and exploring historic sites from Revolutionary War battlefields to industrial-era heritage.
Best Time to Visit
Connecticut parks are at their best from May through October. Summer (June–August) brings peak beach season along Long Island Sound and warm lake swimming inland. Spring delivers azalea and mountain laurel blooms (Connecticut’s state flower), plus rushing waterfalls. Fall foliage in Connecticut peaks mid-to-late October and can be spectacular along ridgeline parks like Sleeping Giant and Talcott Mountain. Winter offers cross-country skiing, snowshoeing, and peaceful forest hiking when trails are less crowded. All Connecticut state parks are free for pedestrians year-round; vehicle parking fees ($10–$22 for non-residents) apply at beaches from Memorial Day through Labor Day.
Visitor Tips
Connecticut state parks are free for walk-in visitors year-round. Vehicle parking fees ($10 residents / $15–$22 non-residents) apply at beach parks during summer season (Memorial Day through Labor Day). Inland parks are typically free year-round. Camping is available at select parks — reservations through ReserveAmerica. Connecticut’s compact size means most parks are within a 90-minute drive of any point in the state, making day trips easy. Dogs are allowed on leash but prohibited at swimming areas.
Explore More Connecticut State Parks
Selden Neck State Park is one of many outstanding state parks in Connecticut. Discover more parks in our Best State Parks in Connecticut guide, or use our Park Finder to search by activity, location, or features.
Wildlife & Nature
Selden Neck — the largest island in the lower Connecticut River — is accessible only by boat, creating one of Connecticut’s most primitive camping experiences. The 528-acre island’s isolation from the mainland produces superior wildlife habitat — ground-nesting birds and colonial waterbirds benefit from reduced predator pressure. The island supports mature floodplain forest with massive silver maples and cottonwoods. Bald eagles roost and hunt from the tall trees. The Connecticut River through this section is a Ramsar “Wetland of International Importance.” River otters, mink, and beaver use the island. The island’s four primitive campsites (accessible only by boat) offer genuine wilderness within 2 hours of New York City — a remarkable juxtaposition.
Nearby Attractions
Gillette Castle State Park — visible from the river — offers tours of William Gillette’s eccentric stone castle. Chester-Hadlyme Ferry (1769) provides river crossing. Chester is one of Connecticut’s premier dining destinations. Deep River hosts the annual Ancient Fife & Drum Muster. Essex — named “The Perfect Small American Town” by the Smithsonian — features the Connecticut River Museum. Pratt House (1648) in Essex is among Connecticut’s oldest structures. Hurd State Park provides cliff-top river views.
More parks nearby: Gillette Castle State Park is a short drive away, while Eightmile River Wildlife Management Area lies a short drive away.
⛺ Camping at Selden Neck State Park: Campgrounds & Cabins
| Campsites | 4 sites — Boat-in-only primitive river camping on Selden Neck, the largest island in the Connecticut River (Lyme, CT). Four named boat-in camp areas, each functioning as a single group site rather than individual numbered sites: Cedars (capacity 20 campers), Quarry Knob (capacity 12 campers), Springledge (capacity 8 campers), and Hogback (capacity 6 campers). Each area has picnic tables, fire pits/fireplaces, and a pit toilet (outhouse). No hookups, no showers, no potable water on the island -- campers must bring their own water. |
|---|---|
| Pets | Pets are not permitted in the camping areas. |
| Reservations | Reserve America, online (connecticutstateparks.reserveamerica.com) or phone 1-877-668-CAMP (2267), up to 11 months in advance. Park entrance itself is free; camping carries a separate per-person fee of $5.00/person/night. Length of stay limited to one night per booking. Minors must be accompanied by an adult who accepts responsibility for them. All day-visitors to the campsites must leave by 8 p.m. |
| Special sites | Island access is by boat only -- there is no road or bridge access. The nearest boat launch is at Deep River Landing on the west side of the Connecticut River, directly across from the island. Selden Neck is one of four CT DEEP river-camping locations along the Connecticut River (with Hurd, Gillette Castle, and River Highlands State Parks); unlike the other three, which are restricted to canoes/kayaks only, Selden Neck's sites are reachable by any boat. Memorial Day through Labor Day requires a parking permit at the mainland boat launch. |
| Season notes | River camping season runs May 1 through September 30 each year (2026 season specifically: opens Friday, May 1; closes Wednesday, September 30 at noon). Park day-use hours are 8:00 a.m. to sunset year-round. |
Camping questions about Selden Neck State Park
Can you camp at Selden Neck State Park?
Yes. Selden Neck State Park has 4 campsites. Boat-in-only primitive river camping on Selden Neck, the largest island in the Connecticut River (Lyme, CT). Four named boat-in camp areas, each functioning as a single group site rather than individual numbered sites: Cedars (capacity 20 campers), Quarry Knob (capacity 12 campers), Springledge (capacity 8 campers), and Hogback (capacity 6 campers). Each area has picnic tables, fire pits/fireplaces, and a pit toilet (outhouse). No hookups, no showers, no potable water on the island -- campers must bring their own water.
How do you reserve a campsite at Selden Neck State Park?
Reserve America, online (connecticutstateparks.reserveamerica.com) or phone 1-877-668-CAMP (2267), up to 11 months in advance. Park entrance itself is free; camping carries a separate per-person fee of $5.00/person/night. Length of stay limited to one night per booking. Minors must be accompanied by an adult who accepts responsibility for them. All day-visitors to the campsites must leave by 8 p.m.
Are pets allowed at the Selden Neck State Park campground?
Pets are not permitted in the camping areas.
Source: portal.ct.gov (verified July 2026). Details change seasonally — confirm when booking.
🐾 Dogs & Pets at Selden Neck State Park
- Pets allowed? statewide rule
- Pets on a leash are permitted in most Connecticut state parks and forests, but not in buildings, swimming areas or state park campgrounds.
- Leash rule statewide rule
- Pets must be leashed and under control at all times; in state forest camping areas the leash may be no longer than 7 feet.
- Beaches & swim areas statewide rule
- Pets are prohibited in swimming areas; Sherwood Island and Squantz Pond State Parks ban pets entirely April 15 - September 30.
- Cabins & lodging statewide rule
- Pets are banned from all state park campgrounds; they are allowed only in the American Legion, Pachaug and Salt Rock state forest campgrounds, but not on rustic cabin sites.
- Statewide exceptions statewide rule
- Pets prohibited year-round at Dinosaur State Park and in the formal gardens and beach at Harkness Memorial State Park.
Are dogs allowed at Selden Neck State Park?
Pets on a leash are permitted in most Connecticut state parks and forests, but not in buildings, swimming areas or state park campgrounds. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via portal.ct.gov. More: Connecticut state parks guide · Dog rules in all 50 states compared
Park Location
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