When Is the Next Negative Low Tide?

When Is the Next Negative Low Tide? Understanding the Rarity and Timing of These Shelling Goldmines in SWFL

One of the most common questions we get from serious shellers is:

“When is the next negative low tide? I want to book a tour when the tides are at their lowest!”

We get it! Negative low tides can feel like striking gold for shellers—but here’s what you need to know:

What Is a Negative Low Tide?

A negative low tide means the water level drops below the average low tide line—literally below sea level. These extra-low tides expose areas of the sandbar and seafloor that are usually underwater, revealing fresh shell beds and hidden treasures that haven’t been picked over.

But here’s the catch… negative low tides are rare in Southwest Florida and very seasonal.

When Do Negative Low Tides Happen in SWFL?

You’ll only see negative low tides a few times per month, generally around the full moon and new moon, and typically only in winter and summer—and never at convenient midday times. Their timing flips with the seasons:

❄️ Winter:

• Negative lows occur near sunrise

• You’ll arrive on the island at the lowest point, but the tide rises fast the entire rest of the tour

• Great for early-bird shellers who want first dibs on what’s been revealed overnight

☀️ Summer:

• Negative lows occur near sunset

• You’ll start the tour with the tide still high, and then it will drop fast as the tour goes on

• Great for seeing new shell beds emerge right before your eyes

🗓️ So When Is the Next One?

Since they vary every month—and shift a little each day—it’s not as simple as picking a date on the calendar. If you want to target a negative low tide, your best bet is to:

✅ Check tide charts for -0.4ft or lower

✅ Look for early morning low tides in December through February

✅ Look for late afternoon low tides in May through July

✅ Contact us and we’re happy to check the next one that lines up with our tour schedule and boat availability

Should You Plan Around a Negative Low Tide?

Negative low tides are fun and exciting, but they’re not the only time to find amazing shells. The islands we visit on our tours are naturally loaded with treasures year-round. We don’t need extreme tides to have incredible finds!

But if you’re someone who’s been dreaming of walking out further on the sandbar or seeing that hidden stretch of sea bottom, planning around one of these rare windows can be a special experience—just know you’ll have to work with nature’s clock and a bit of luck.

Want us to keep an eye out for the next good one? Shoot us a message and we’ll let you know when the next low-tide window aligns with available tour spots.

Pro Tip: Any time you see a Keewaydin Tour offered on my schedule, you can assume the tide will be at least -0.1' or lower—because I only offer Keewaydin tours when the tide is right!