The Complete Summer Island Guide. (2026)

Executive Summary

Summer Island is a gated Intracoastal boating community of more than 90 homes on the Matanzas River, south of St. Augustine Beach along A1A, where the ocean sits directly across the road. It is one of the few subdivisions in the area with its own private boat launch, boat slips, and community dock.

The community dates to about 1990 and mixes direct Intracoastal-front homes, where you can dock a boat in the backyard, with interior island homes that share the launch, dock, pool, tennis, and basketball amenities.

For pricing context, Summer Island mostly features large homes that trade at a premium for the water access, with direct waterfront commanding the top of the market. A specific home should be priced off recent comparable sales.

Quick Facts

Community Overview & History

A boaters island between the river and the ocean

The A1A corridor south of St. Augustine Beach is old-Florida coast: the Matanzas River on one side, the dunes on the other, and Crescent Beach and the Matanzas Inlet minutes away. Summer Island is the corridor boating play, a gated enclave with its own launch and dock on the river.

How it feels on the ground today

Summer Island reads as a relaxed, salt-air boating neighborhood: the launch and the dock are the center of gravity, the pool and courts back them up, and the homes range from classic coastal customs to newer builds. The ocean across A1A makes it a true two-water lifestyle.

The Community and What You Are Buying

Summer Island is about the water tiers: direct Intracoastal frontage, interior island lots, and everything between.

Direct Intracoastal homes

Backyard docks and lifts on the Matanzas River sit at the top of the market.

Interior island homes

Interior lots share the launch, dock, and amenities at a lower entry price.

Custom and coastal builds

Homes span 1990s customs to newer coastal construction, so condition and elevation vary.

Real Estate Market

Summer Island appeals to boaters and second-home buyers who want gated river access with the beach across the road.

Large homes dominate and the water tier sets the price, with direct Intracoastal frontage commanding clear premiums. Price a specific home off the closest comparable sales.

Inventory is thin in a 90-home gated community, so well-priced homes with documented dock rights move quickly.

Who Lives Here

Summer Island draws boaters first, the launch, slips, and dock are the reason it exists, plus beach-and-river second-home buyers and full-timers who want gated privacy on the Matanzas.

Schools

Summer Island is served by the top-rated St. Johns County School District, with attendance zones by home address. Confirm the exact zoning for a Summer Island address before you buy.

Amenities & Lifestyle

The amenity set is built around the water, which is exactly why buyers shop here.

Private boat launch

A resident launch on the Matanzas River, one of the few in the area.

Community dock and slips

A community dock available to homeowners, with slips and lifts at individual homes on the river.

Pool and clubhouse

A community pool and clubhouse anchor the social side.

Tennis and basketball

Courts round out the amenity set.

HOA, CDD & Costs

Summer Island has an HOA that funds the gate, the launch, the dock, the pool, and the courts. Confirm the current dues, the slip and launch rules, and any waitlists for a specific home.

For waterfront homes, confirm the dock and lift permits, the bulkhead condition, and the depth at low tide for the boat you run.

Pull the flood designation and elevation certificate for the specific address and quote flood and wind insurance early, since this is a barrier-corridor community.

Commute Analysis

Summer Island sits on the quiet stretch of A1A between Crescent Beach and the Matanzas Inlet, so daily life runs on the beach-road clock, with historic St. Augustine about twenty minutes north when you want the restaurants and events.

Shopping & Dining

Everyday needs run to Crescent Beach and the US-1 corridor, with the St. Augustine Beach restaurants about ten minutes north and the historic district twenty-plus minutes away. The beach across A1A and the river out back are the real amenities.

Pros and Cons

Summer Island vs. Comparable Communities

Hidden Things Buyers Should Know

The launch is the moat

Private launches are nearly impossible to replicate on this stretch of coast, which protects Summer Island values. Confirm the launch and slip rules and any waitlist before you write.

Two-water lifestyle

The Matanzas out back and the ocean across A1A is a rare pairing; surf in the morning, fish the river in the afternoon.

Insurance first

Coastal flood and wind quotes vary widely by elevation and construction year. Get the quote before the offer, not after.

Momentum Expert Insight

Selling a Home in Summer Island

Selling in Summer Island is about presenting the launch, the dock rights, and the two-water lifestyle to the boating buyers who specifically hunt for it, and pricing correctly off the closest comparable sales.

We price from the most recent comparable homes, account for the water tier and dock infrastructure, and market to boating and second-home buyers across the region.

Flood Zones & Insurance

St. Johns County flooding concentrates near the Intracoastal, the coast, and the creeks and marshes, while many inland master-planned communities sit in lower-risk zones.

The reliable move is to pull the FEMA flood designation for the exact Summer Island address before you write an offer, since two homes in the same area can fall in different zones. A home in Zone X can cost far less to insure than one near water in Zone AE. Get a bindable flood and homeowners quote during your inspection period, so the cost is in your monthly math before you commit, not after.

Internet & Connectivity

St. Johns County is well served by AT&T (fiber in most newer communities) and Xfinity (Comcast), though fiber availability still varies by street. If working from home matters, confirm the options, and fiber in particular, at the specific Summer Island address rather than assuming.

The Tax Reality

St. Johns County total millage varies by district, and CDD assessments are common in the master-planned communities, which adds to the all-in cost on top of the millage. The Florida homestead exemption for 2026 is 51,411 dollars for those who qualify, and the deadline to file a new homestead exemption is March 1.

The trap to plan for is the post-sale reset: when you buy, the Save Our Homes cap from the previous owner ends and the assessed value resets to the new just value, so your second-year tax bill is often higher than the seller current one. Budget the true number, and confirm whether the specific home carries a CDD or other assessment that is billed separately from the millage and is not reduced by the homestead exemption.

What Your Budget Buys Here

The same budget buys very different homes across Summer Island and the surrounding area, depending on age, size, lot, and condition. Rather than anchor on the asking price or the neighborhood average, price any specific home off the most recent comparable sales, and weigh what your money would buy in the nearby alternatives before you commit.

The Future of the Area

St. Johns County continues to grow, with new rooftops, retail, and road work reshaping parts of the area. That growth supports long-run demand, but it can also add competing inventory and construction traffic in the near term, so factor both the upside and the disruption into your timing and your pricing.

Resale Liquidity

How quickly a Summer Island home resells comes down to presentation, condition, and pricing against the latest comparable sales rather than the neighborhood average. Homes that are priced correctly and shown well tend to move, while overpriced or dated homes sit. We track the active and sold comparable set so a Summer Island home is priced to the real market.

The Summer Island Playbook

If you are buying in Summer Island, here is how we would approach it: pull the flood zone and a real insurance quote for the specific address, confirm the HOA dues and whether a CDD applies, compare what your budget would buy nearby, and price the home off the closest comparable sales rather than the asking price. If you are buying any new-construction home, bring your own agent before you register, since the on-site representative works for the builder, not for you.

Questions We Would Ask Before Buying Here

Mistakes to Avoid

The common ones around Summer Island: trusting the seller current tax bill instead of the post-sale reset; skipping the address-specific flood check; assuming fiber is at every home; and pricing off the neighborhood average rather than the closest comparable sales. Each is avoidable with the right diligence, which is exactly where having your own agent pays off.

Frequently Asked Questions

Where is Summer Island?

Summer Island is on A1A south of Crescent Beach in St. Augustine 32080, on the Matanzas River with the ocean across the road, near the Matanzas Inlet.

Is Summer Island gated?

Yes. Summer Island is a gated community of more than 90 homes.

Does Summer Island have a boat launch?

Yes. The community has a private resident boat launch plus a community dock, and many riverfront homes have private docks and lifts.

What do homes in Summer Island cost?

Large homes dominate and the water tier sets the price, with direct Intracoastal frontage at the top of the market. Price a specific home off recent comparable sales.

What amenities does Summer Island have?

A private boat launch, a community dock, a pool, a clubhouse, tennis, and basketball, all behind the gate.

Are there waterfront homes in Summer Island?

Yes. A number of homes sit directly on the Matanzas River with backyard docks; others are interior island lots that share the community water access.

How old is Summer Island?

The community dates to about 1990 and has continued to develop over the years, so construction vintages vary.

What schools serve Summer Island?

The top-rated St. Johns County district, with zones set by address. Confirm the exact zoning before you buy.

How far is Summer Island from the beach?

The ocean is directly across A1A, and Crescent Beach access points are about five minutes away.

How far is Summer Island from St. Augustine?

Historic St. Augustine is about 20 to 25 minutes north.

Is Summer Island in a flood zone?

It is a coastal river community, so flood designations and elevations vary by lot. Pull the certificate and quote flood and wind insurance early.

Is Summer Island good for boaters?

It is one of the best gated boating setups in the area: launch, slips, dock, and a short run to the Matanzas Inlet.

Is Summer Island a good second-home community?

Yes. The gate, the amenities, and the two-water setting make it popular with second-home buyers; confirm rental rules if income matters.

What is near Summer Island?

Crescent Beach, the Matanzas Inlet, Fort Matanzas National Monument, and the restaurants of St. Augustine Beach.

Who should I call about buying in Summer Island?

Call Momentum Realty at (904) 351-6461 or use the form on this page, and we will connect you with a coastal St. Augustine specialist.

Do I need my own agent to buy in Summer Island?

Yes. The listing agent works for the seller. Your own agent represents only you, verifies dock rights and insurance, pulls the true comparable sales, and structures an offer that protects you.

Related Reading

If you are weighing Summer Island against other coastal and boating communities, these guides are a good next step.