Red Grouper sea surface temperature guide.
Red grouper are year-round structure species on Gulf live bottom and South Atlantic ledges. SST influences seasonal trip accessibility more than where individual fish hold.
SST threshold gauge
The water temperature ranges that determine where red grouper hold and feed. Hard thresholds (dashed lines) are values outside which fish actively depart or become inactive.
Depth profile & SST reliability
Red grouper hold tight to live bottom and structure. Like gag, seasonal accessibility and aggregations track SST trends but individual fish location is bathymetry- and structure-driven.
Current systems & structure
Common on Gulf live bottom and South Atlantic ledges. Year-round structure species.
Zone-by-zone calendar
For each zone where red grouper are present, the chart overlays the zone's typical monthly SST range with the species' preferred and optimal ranges. Months where the bands overlap are when fish are in range.
Gulf of Mexico
| Month | Zone SST | Status |
|---|---|---|
| Jan | 60–68°F | Peak |
| Feb | 60–66°F | Peak |
| Mar | 62–70°F | Peak |
| Apr | 70–76°F | Peak |
| Maynow | 74–80°F | Outside |
| Jun | 80–84°F | Outside |
| Jul | 82–86°F | Outside |
| Aug | 82–86°F | Outside |
| Sep | 80–84°F | Outside |
| Oct | 74–80°F | Outside |
| Nov | 68–76°F | Peak |
| Dec | 62–70°F | Peak |
| Month | Zone SST | Status |
|---|---|---|
| Jan | 60–68°F | Peak |
| Feb | 60–66°F | Peak |
| Mar | 64–72°F | Peak |
| Apr | 70–78°F | Peak |
| Maynow | 74–80°F | Outside |
| Jun | 80–84°F | Outside |
| Jul | 82–86°F | Outside |
| Aug | 82–86°F | Outside |
| Sep | 80–84°F | Outside |
| Oct | 72–78°F | Fishable |
| Nov | 66–74°F | Peak |
| Dec | 62–70°F | Peak |
Conservation & regulations
Stable (Gulf) — managed under recovery framework. Federal bag and size limits. Gulf and South Atlantic regulations differ. Verify current rule.
Stock assessment source →Drop dead bait and live pinfish to live bottom and rocky ledges. Red grouper are less migratory than gag — find the structure, find the fish.
Sources
SST threshold data is summarized from agency and research sources. Year-to-year ocean conditions vary; verify current SST imagery before each trip.
See live SST for your offshore zone.
Bield: Fish overlays NOAA CoastWatch SST imagery on your chartplotter view, highlights the temperature breaks that match red grouper thresholds, and alerts you when your home zone hits the 64–72°F window.