Mutton Snapper Spawn Peaks in the Keys as Grouper Season Opens

What's Biting

What's Next

The coming days should remain productive for both bottom fishing and offshore action. Winds running 17-18 knots at NOAA buoys SMKF1 and SANF1 on May 24 are breezy but workable; watch for the early-morning calm window before the afternoon trades fill in. The first-quarter moon produces moderate tidal swings, which generally supports steady anchoring conditions on the reef without the aggressive current pushed by a full moon.

**Mutton and yellowtail snapper** are the near-term headliners. ALL IN Key West reports the spawn cycle is fully engaged right now and should hold strong through the first week of June. Live pilchards and threadfin herring on the bottom are the standard approach; yellowtails pile up readily on a chum slick. The next full moon, roughly two weeks out, should trigger another peak in spawn activity, so keep the lunar calendar handy.

**Grouper season** has been open since May 1, per Coastal Angler Magazine. Black grouper, gag, and red grouper are the targets on deeper reef sections and offshore wrecks. A calmer day is ideal for anchoring up in 80-120 feet; these fish dive straight for the rocks on the bite, so heavy tackle and no slack line are non-negotiable. Verify current bag limits and size minimums before harvesting. The bite should remain consistent into June before summer heat pushes fish deeper.

**Blackfin tuna** are in their prime window. Sport Fishing Mag notes May through July as peak time for these fish from the Keys north through Palm Beach. Live pilchard drifts, kite fishing, and cedar plug trolling all produce. Watch for current seams and color changes offshore; blackfins concentrate along temperature breaks and weedlines.

**Cobia and kingfish** rounded out the Gulf-side spread reported by ALL IN Key West. Cobia draw well to rays, sharks, and floating debris this time of year. Pitch a live pinfish or blue crab for best results. Kingfish are typically found along the Atlantic reef edge on slow-trolled live baits or high-speed feathers. Plan an early-morning departure this Memorial Day weekend to beat boat traffic and get on the fish before afternoon chop builds.

Context

Late May is historically one of the most productive fishing windows in the Florida Keys, anchored by the mutton snapper spawn. Captains who fish the Keys annually plan trips specifically around this period. The spawn concentrates fish on predictable reef structure from mid-May through late June, with activity peaking around full moons. ALL IN Key West's description of mutton snappers 'chewing like crazy' is entirely consistent with the historical pattern; this is not an outlier. It is the reason late-May trips get booked months in advance.

Grouper season's May 1 reopening, flagged by Coastal Angler Magazine, is also a well-established calendar marker. By Memorial Day weekend, fish that have been off-limits since winter have had nearly four weeks to redistribute on structure and resume normal feeding patterns. The bite tends to be aggressive in early May and settles into a reliable but measured rhythm through summer as water temperatures climb.

Blackfin tuna's arrival is similarly on schedule. Sport Fishing Mag's framing of May through July as prime time for blackfins off South Florida reflects a long-standing seasonal migration pattern. These fish track baitfish concentrations along the Atlantic shelf edge as water temperatures rise. The late-April reading of 78°F from buoy 41114 is consistent with historical late-spring Keys ranges; by late May, nearshore surface temps are typically in the low 80s.

The first-quarter moon on May 24 is not a traditional peak for spawn fishing since full moons drive that dynamic. It does, however, set up a favorable two-week window ahead of the early-June full moon, giving anglers time to plan a peak spawn trip. Targeting the days surrounding that upcoming full moon alongside current grouper and tuna activity makes for a well-rounded summer Keys itinerary.

One data gap worth noting: Bud n' Mary's (FL Keys) typically provides detailed Upper Keys conditions updates, but no May 2026 report was available in the current intel feeds. Their most recent post covered March 2026, leaving a gap in the Islamorada-area picture. The ALL IN Key West charter reports cover the Lower Keys and Gulf side; conditions around the Middle and Upper Keys flats may differ.