Florida Keys Mutton Spawn Is On — Yellowtail, Cobia, and Pelagics Bite

What's Biting

What's Next

With the full moon giving way to the waning crescent, mutton snapper spawn aggregations should hold tight on their traditional spawning ledges for roughly another week before fish begin to disperse. ALL IN Key West notes that May through July are "lights out" across the board — snappers, groupers, sharks, mahi-mahi — meaning bottom fishing will remain productive well into June even as spawn aggregations break up.

On the Gulf-of-America side of the Keys, the recent ALL IN Key West Gulf run offers a blueprint worth repeating: a mixed bag of groupers, snappers, cobia, barracudas, and kingfish came together in a single trip on live and dead bait. Cobia concentrate in May around floating structure and reef edges before moving on, so this week represents a prime window to target them deliberately before the run passes.

Both nearshore buoys — SMKF1 at Sombrero Key and SANF1 at Sand Key — reported light winds of 2.1 and 3.1 m/s respectively in the early hours of May 13, translating to roughly 5–7 mph. Those are ideal conditions for poling the flats and running offshore to reef structure. If this calm window holds through the weekend, it's a strong opportunity to range farther offshore toward color changes and weed lines. Watch the local marine forecast carefully, as afternoon sea breeze can build significantly across exposed sections of the reef tract.

Live bait remains the dominant technique. ALL IN Key West has been producing king mackerel, tuna, and sailfish on live bait presentations along the reef edge — a setup that should continue as baitfish pods concentrate in current seams. For bottom species, slow-drifting live pilchards or pinfish over known mutton and yellowtail ledges is the go-to approach. The yellowtail bite has been especially forgiving, with the charter reporting fish that barely need coaxing.

Mahi-mahi should become increasingly available through May as Gulf Stream eddies push weed lines toward accessible offshore water. Plan runs toward color changes and floating debris lines for the best dolphin action, and monitor current reports from reef-edge captains before committing to a long offshore run.

Context

May is a benchmark month for Florida Keys fishing, and this cycle is delivering textbook conditions. The mutton snapper spawn — tied to the full moons of May, June, and July — is one of the most predictable and storied events on the Keys calendar. Captains have charted these spawning aggregations for generations; the bite reported this cycle by ALL IN Key West is right on script, with fish packed tight on ledges and feeding hard around the lunar peak. The waning crescent phase typically sees spawn aggregations begin to break up, but the feeding activity that follows is often exceptional as fish recover energy and disperse back to home structure.

Water temperature context is encouraging: the 78°F reading from buoy 41114 in late April is consistent with typical Keys surface temperatures for this time of year, which generally run from the mid-70s to low 80s°F through spring and early summer. These temperatures support active metabolisms across nearshore and offshore species and coincide with baitfish arrivals that draw predators to the reef tract.

The 2026 regulatory picture offers broader context for Atlantic-side anglers. Coastal Angler Magazine reports that Florida's Atlantic recreational red snapper season has been expanded to 39 days under a new state-managed exempted fishing permit — reportedly the longest Atlantic snapper season since 2010 — running May 22 through June 20 plus three-day weekend sessions in October, with a one-fish daily bag limit per person. Verify current regulations before fishing. While the Keys fishery is primarily Gulf-oriented for snapper, the shift toward state-managed access reflects momentum building across Florida's marine fisheries more broadly.

Tarpon migration is a May fixture in the Keys backcountry and channels. Though no specific tarpon reports appeared in today's intel feeds, May is historically the peak month for sight-casting to silver kings on the flats and under the bridges — and the calm, light-wind conditions shown this morning by SMKF1 and SANF1 are exactly the sight-fishing windows guides wait for all year. Anglers targeting tarpon should consult local tide charts and plan for incoming tide windows on the oceanside flats.