Keys route planner
Driving the Overseas Highway: Miami to Key West through the Keys
The Overseas Highway (US-1) runs about 160 miles from Miami to Key West on a single road, crossing the Seven Mile Bridge and a chain of islands to mile marker zero in Old Town. It is toll-free but slow — two-lane stretches, one road in and out, and one bad crash can stall the whole chain — so give it a full day and stay at least a night. In Key West, base in walkable Old Town for Hemingway's home and its six-toed cats, Fort Zachary Taylor's beach, the lighthouse, and the butterfly conservatory.
7 checked places checked July 13, 2026
Positioning
Use this guide when
Best for - Travelers deciding whether to day-trip or overnight in the Keys.
- Drivers who want the timing, mile-marker, and traffic reality before leaving Miami.
- Planners deciding what to actually do once they reach Key West.
Tradeoffs - A same-day round trip is possible but wastes the best of Key West and risks a night drive back up a single road.
- An overnight costs a Key West room but buys the town after the day-trippers and cruise crowds leave.
- The drive itself is the scenery, so rushing it to 'get there' misses the point of the Keys.
Treat the drive as part of the trip and give it a night. Leave Miami early, navigate by mile markers, and expect two-lane single-file stretches where one crash can stall everything; the Seven Mile Bridge near Marathon is the scenic centerpiece. In Key West, base in Old Town at The Marker or the quieter Marquesa so you can walk to Hemingway's home, Fort Zachary Taylor's beach, the lighthouse, and the butterfly conservatory without moving the car. If you only have one day, drive down early, keep Key West to a half day, and accept you'll be tired — but the far better version is an overnight so you own the town at sunrise and sunset.
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The drive: distance, time, and mile markers
The single most useful thing is to know how long it really takes and how to navigate it.
- About 160 miles Miami to Key West, roughly 3.5 to 4 hours nonstop but a full day with stops and traffic.
- Navigate by mile markers: MM 0 is in Key West and numbers climb toward the mainland; most Keys addresses use the MM number.
- The Overseas Highway is toll-free (the only toll is the optional Card Sound Road shortcut into north Key Largo).
Calibration Keep the drive framed as a full-day, single-road leg so readers plan enough time.
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One road in, one road out
The Keys' single-highway reality shapes when you drive and whether you overnight.
- US-1 has long two-lane stretches and the Seven Mile Bridge near Marathon, so one crash or holiday backup can stall the whole chain.
- Leave early, avoid holiday weekends, and don't plan a tight same-day return that leaves you driving back after dark.
- An overnight in Old Town removes the night-drive risk and gives you the town after the day crowds leave.
Calibration Keep the one-road constraint front and center so readers don't plan a rushed round trip.
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What to do at the end
Old Town is walkable, so base there and leave the car.
- Hemingway's home and its six-toed cats ($19 adult as of 2026) is the signature stop; go in the cooler morning.
- Fort Zachary Taylor is the best beach in town; the lighthouse and the butterfly conservatory are good hot- or rainy-afternoon stops.
- Base in Old Town so all of it is a walk, not a drive.
Calibration Keep the Old Town anchors distinct by payoff — home, beach, landmark, indoor — so each earns its stop.