Miami to Key Largo by Boat – Distance, Time & Fuel Calculator

Miami to Key Largo Route Calculator

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40
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46
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74
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Planning a boat trip from Miami to Key Largo? The calculator above shows distance, travel time, and fuel consumption for your Florida Keys adventure. Key Largo is the first and largest island in the Keys chain — the gateway to world-class diving and fishing.

Distance from Miami to Key Largo

The distance from Miami to Key Largo is 40 nautical miles (46 statute miles or 74 kilometers) via the offshore route. This makes it a perfect day trip — close enough for a quick run, far enough to feel like you've escaped the city.

Key Largo is the northernmost island in the Florida Keys, stretching 33 miles long. It's famous for John Pennekamp Coral Reef State Park — the first underwater park in the U.S. — and some of the best diving and snorkeling in North America.

Two Routes to Key Largo

Option 1: Offshore via Hawk Channel (Recommended)

Distance: ~40 nm | Best for: Speed, larger boats

Exit Miami through Government Cut, head south along the coast, then follow Hawk Channel — the protected waterway between the reef and the Keys. Water depth is 10–20 feet, well-marked, and easy to navigate. This is the fastest route for most powerboats.

Option 2: Inshore via Biscayne Bay (Scenic)

Distance: ~45 nm | Best for: Sailboats, trawlers, exploring

Travel south through Biscayne Bay, past Biscayne National Park and Elliott Key, through Card Sound, then into Barnes Sound and Blackwater Sound. This route is protected from ocean swells but has no-wake zones and shallow sections (watch your draft). Perfect for anchoring overnight at Elliott Key.

Travel Time to Key Largo

Typical crossing times by vessel type:

  • Fast center console (25–30 knots): 1.5 hours
  • Sport fishing boat (20 knots): 2 hours
  • Cruiser or trawler (12 knots): 3.5 hours
  • Sailboat (6–8 knots): 5–7 hours

Pro tip: Depart early to avoid afternoon winds. The run down Hawk Channel can get choppy when east winds build after noon.

Navigation Tips

Hawk Channel Navigation

Hawk Channel runs between the reef line (marked by green and red buoys) and the Keys. Stay in the channel — depths outside can drop to coral heads or shoals. Key markers to watch:

  • Fowey Rocks Light: Marks the northern end of the reef
  • Pacific Reef: Stay west of marker
  • Carysfort Reef Light: Near Key Largo — you're almost there

Entering Key Largo

For Ocean Reef Club area, use the marked channel north of Key Largo. For central Key Largo marinas, continue in Hawk Channel to the Jewfish Creek/Card Sound area. For John Pennekamp, anchor off the park or use the marked entrance.

Where to Dock in Key Largo

Key Largo has several marina options:

  • Marina Del Mar: Full-service, fuel, close to restaurants
  • Anchorage Resort & Marina: Protected basin, pool access
  • Key Largo Harbor Marina: Quiet, affordable
  • Ocean Reef Club: Private, members/guests only

Anchoring: Blackwater Sound offers good holding in 6–10 feet. Rodriguez Key is a popular overnight spot with beautiful sunset views.

What to Do in Key Largo

Key Largo is the "Diving Capital of the World." Top activities:

  • John Pennekamp State Park: Snorkel/dive the Christ of the Abyss statue
  • Molasses Reef: Premier diving spot with massive coral formations
  • Fishing: Backcountry flats for bonefish, offshore for mahi and sailfish
  • Florida Keys Wild Bird Rehabilitation Center: Free sanctuary
  • Sunset at Fish House: Classic waterfront dining

⚠️ Reef Navigation: The Florida Keys reef is protected. No anchoring on coral. Stay in marked channels. If running Hawk Channel at night, use GPS and watch for crab trap floats. Slow down in Biscayne Bay manatee zones.

Frequently Asked Questions

How far is Key Largo from Miami by boat?

About 40 nautical miles (46 statute miles) via Hawk Channel. The inshore route through Biscayne Bay is slightly longer at ~45 nm.

How long is the boat ride from Miami to Key Largo?

1.5 to 4 hours depending on speed. Fast boats (25+ knots) make it in under 2 hours. Cruisers at 12 knots take 3–4 hours.

What's the best route to Key Largo?

Hawk Channel for speed and simplicity. Biscayne Bay/Card Sound for a protected, scenic route with anchoring options at Elliott Key.

Can I take the ICW to Key Largo?

Yes — through Biscayne Bay, Card Sound, and Barnes Sound. Expect no-wake zones and 5–7 foot depths in places. Good for sailboats and trawlers.

Is Key Largo a good day trip from Miami?

Absolutely. With a fast boat, you can be there in under 2 hours, spend the day diving or fishing, and return before sunset. One of the best day trips in South Florida.

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