What Tom's Harbor Cut Offers
Tom's Harbor Cut is a narrow tidal pass on the bayside of the Middle Keys, roughly three miles south of Marathon. The cut connects the shallow flats of Boot Key Harbor to the deeper water of the Atlantic, and it funnels baitfish and gamefish twice daily with the tide. The water runs 4 to 8 feet deep in the channel itself, but the surrounding flats drop to 2 to 3 feet—shallow enough to sight-fish and pole, deep enough to hold permit, tarpon, and large bonefish.
The cut is best known as a permit fishery. Permit move through on incoming and outgoing tides, feeding on crustaceans in the sand and mud. The water clarity varies sharply with wind and tide; a calm morning with an incoming tide can give you 6 to 8 feet of visibility, while an outgoing tide or a stiff breeze can turn the water the color of weak tea. Most anglers fish the cut itself and the flats immediately adjacent to it rather than venturing far into Boot Key Harbor.
Key Takeaways
- Tom's Harbor Cut is a tidal pass that holds permit, tarpon, and bonefish on incoming and outgoing tides, with the best visibility on calm mornings.
- You can fish from a boat or wade the shallower flats, but the cut itself requires a shallow-draft skiff or poling platform to reach the best water.
- Permit fishing here demands sight-casting with small crabs or shrimp; blind casting rarely produces results in water this shallow.
- Tidal timing matters more than time of day—plan your trip around the incoming tide, which concentrates fish in the cut and improves water clarity.
- The cut is accessible year-round, but late fall through early spring offers the most consistent permit activity and the calmest conditions.
How to Reach Tom's Harbor Cut
From Marathon, head south on US 1 toward Key West. The cut lies between mile marker 49 and mile marker 48, directly south of the town. If you have your own boat, launch at one of the Marathon public ramps—the Vaca Cut boat ramp on the bayside is closest, roughly 15 minutes by water. If you do not have a boat, hire a guide; most Marathon-based permit guides know the cut well and can position you for the incoming tide.
The approach by water is straightforward but requires attention to depth. The channel into Boot Key Harbor is marked, but the flats around the cut are not. Run at idle speed and watch your depth sounder; you will see the water deepen as you approach the cut from the harbor side. Many anglers anchor on the deeper side of the cut and wade onto the flats, or pole slowly along the channel edge.
Permit and Tarpon in the Cut
Permit are the primary target here. They arrive on the incoming tide, often in small groups of two to four fish. They feed with their tails up, rooting in the sand for crabs and shrimp. A sight-cast with a small crab fly (size 2 to 4) or a 1/8-ounce jig tipped with a live or dead shrimp works best. Cast ahead of the fish's path, let the fly or jig settle, and strip slowly. Permit are spooky—a sloppy cast or a shadow on the water will send them fleeing.
Tarpon also move through the cut, especially in spring and early summer. They are less predictable than permit and often cruise deeper in the channel. A 2/0 to 3/0 tarpon fly or a live mullet on a light spinning rod will draw strikes. Tarpon in the cut tend to be smaller than those in the channels further west, typically 40 to 80 pounds, but they are no less acrobatic.
Bonefish and Seasonal Patterns
Bonefish use the cut as a highway between the flats and deeper water. They are less selective than permit and will eat a wider range of flies and baits. A small tan or white bonefish fly (size 4 to 6) or a 1/16-ounce jig works well. Bonefish here average 4 to 6 pounds, and they are fast—bring a reel with a smooth drag and at least 150 yards of backing.
Late fall through early spring is the most reliable season. Water temperatures drop, and fish concentrate in the deeper channels and cuts. Summer and early fall can be productive, but the heat and afternoon thunderstorms make conditions less predictable. Winter cold fronts can shut down the bite for a day or two, but they also clear the water and bring fish into the shallows.
Tackle and Technique for Shallow Water
Use a 7 to 9-weight fly rod if you are fly fishing; the extra power helps you cast into the wind and turn over larger flies. A 8 to 10-pound leader with a 4 to 6-pound tippet is standard for permit and bonefish. Bring multiple spools of tippet material—you will break off on rocks and shells. If you are spinning, a 6 to 7-foot medium-light rod with 10-pound braid and a 12-pound fluorocarbon leader will handle most situations.
Sight-casting is the only reliable method in water this shallow. Polarized sunglasses are essential—they cut the glare and let you see fish 30 to 40 feet away. Wade slowly and scan the flats ahead of you. When you spot a fish, stop, wait for it to move closer or into a better position, and cast. Rushing the cast is the most common mistake. Permit and tarpon will spook at the sound of a fly line hitting the water if they are close enough to hear it.
Tides and Timing
The incoming tide is almost always better than the outgoing tide. Fish move into the cut to feed, and the rising water pushes baitfish ahead of them. Plan to fish the last two hours of the incoming tide and the first hour after high tide. The outgoing tide can work, but fish are often scattered and less aggressive.
Water clarity improves with a calm wind and an incoming tide. A morning with a light east or southeast wind and a rising tide is ideal. Afternoon winds often come from the west or southwest and can churn up the flats. If you have a choice, fish early in the day when the water is calmest and clearest.
Regulations and Access
Florida saltwater fishing requires a saltwater fishing license for anyone 16 and older. You can purchase a license online through the Florida Fish and Wildlife Conservation Commission website or at most bait and tackle shops in Marathon. A three-day license is available if you do not want a full-year license.
There are no special restrictions on Tom's Harbor Cut itself, but the surrounding area is part of the Florida Keys National Marine Sanctuary. Anchoring is allowed in designated areas, and you must follow all state and federal regulations regarding protected species. If you hook a tarpon or permit that is undersized or out of season, handle it carefully and release it immediately.
Frequently Asked Questions
Can I wade fish Tom's Harbor Cut without a boat?
Wading is possible on the flats adjacent to the cut, but you will need to get to the area by boat or hire a guide. There is no public beach or dock that gives you direct access to the cut on foot. If you have a shallow-draft kayak, you can paddle from Marathon, though the distance is roughly three miles.
What is the best time of year to fish for permit here?
Late fall through early spring (November through April) offers the most consistent permit fishing. Water temperatures are cooler, fish concentrate in the cuts and channels, and the weather is generally calmer. Summer and early fall can produce, but afternoon thunderstorms and heat make conditions less reliable.
Do I need a guide to fish Tom's Harbor Cut?
No, but a guide is helpful if you are unfamiliar with the area or new to sight-fishing. Guides know the tidal patterns, the best spots on the flats, and how to read the water. If you have your own boat and experience in shallow water, you can fish the cut on your own.
What flies or baits work best for permit in the cut?
Small crab flies (size 2 to 4) and shrimp flies are most effective. Live or dead shrimp on a 1/8-ounce jig also works well if you are spinning. Permit are selective, so match the size and color of the natural crabs and shrimp in the area—tan, brown, and white are reliable colors.
How deep is the water in Tom's Harbor Cut?
The cut itself runs 4 to 8 feet deep, depending on the tide. The surrounding flats are 2 to 3 feet deep at low tide and 3 to 5 feet at high tide. A shallow-draft skiff or poling platform is ideal, but a standard center-console can navigate the cut if you run at idle speed and watch your depth sounder.