2026 Southern Costa Rica Fishing Calendar

• • The Southern Advantage: Osa & Beyond
• • Monthly Species Breakdown
• • Offshore vs Inshore Techniques
• • Prime Southern Fishing Locations
• • Southern CR Planning FAQs

Southern Costa Rica Fishing Calendar: The 2026 Monthly Guide

The waters of Southern Costa Rica, spanning from the Osa Peninsula to the protected reaches of the Golfo Dulce, represent one of Central America’s last pristine sportfishing frontiers. This Southern Costa Rica fishing calendar breaks down the prime gamefish available throughout the year in this remarkable ecosystem.

2026 Tactical Update: While historical data remains the foundation, 2026 is seeing a shift in pelagic migration. The Southern Costa Rica fishing calendar is currently tracking an extended Yellowfin Tuna run through late spring, and Marlin activity on the offshore seamounts has become more consistent in the “shoulder” months of May and June.

The Monthly Breakdown

January

The start of the year brings optimal conditions for offshore fishing species.

• Blue Marlin: Peak season with excellent opportunities for trophy fish.
• Black Marlin: Strong showing with fish often exceeding 400 pounds.
• Yellowfin Tuna: Consistent action with schools of quality fish.
• Roosterfish: Premium inshore action along rocky points and beaches.

February

Billfish numbers continue to climb as the dry season settles in.

• Blue Marlin: Continued excellent action offshore.
• Sailfish: Beginning of peak sailfish season.
• Cubera Snapper: Prime time for targeting these powerful bottom dwellers.

March

This is arguably the busiest month on the Southern Costa Rica fishing calendar.

• Blue Marlin: Strong presence continues.
• Sailfish: Peak numbers with multiple shots per day common.
• Yellowfin Tuna: Large schools present.
• Black Marlin: Trophy fish opportunities.

April

The transition month offers a mix of heavy hitters both inshore and out.

• Sailfish: Premium sailfish action continues.
• Yellowfin Tuna: Excellent opportunities for both school-size and trophy fish.
• Cubera Snapper: Peak season for these bruising fighters.
• Roosterfish: Inshore action heating up.

May

The “Green Season” begins, bringing nutrient-rich waters and a new wave of predators.

• Blue Marlin: Beginning of summer peak on the seamounts.
• Yellowfin Tuna: Consistent action with quality fish.
• Roosterfish: Excellent inshore opportunities. Read more here about inshore seasonal shifts.

June

Marlin activity moves to the offshore pinnacles.

• Blue Marlin: Peak summer action.
• Yellowfin Tuna: Strong presence of school-size fish.
• Roosterfish: Premium inshore action.

July

Mid-summer provides some of the most consistent offshore fishing seasons for billfish.

• Blue Marlin: Continued excellent summer action.
• Yellowfin Tuna: Reliable action with occasional trophy fish.
• Roosterfish: Consistent inshore opportunities.

August

The final stretch of the summer Marlin bite coincides with the arrival of coastal favorites.

• Blue Marlin: Last month of peak summer action.
• Yellowfin Tuna: Strong showing continues.
• Roosterfish: Premium inshore action.
• Snook: Beginning of the seasonal snook run in the river mouths.

September

While the rains increase, the Dorado migration officially hits the coast.

• Dorado: Start of the dorado run.
• Roosterfish: Excellent inshore action continues.
• Snook: Peak season begins for estuary hunters.

October

Known for the best Dorado fishing on the Southern Costa Rica fishing calendar.

• Dorado: Peak season with numerous opportunities.
• Roosterfish: Consistent inshore action.
• Snook: Prime time for trophy fish.

November

As the transition back to the dry season begins, the big blues return.

• Dorado: Continued strong presence.
• Roosterfish: Premium inshore opportunities.
• Snook: Last month of peak season.
• Blue Marlin: Return of consistent marlin action.

December

A “Grand Slam” month where almost every species is in play.

• Blue Marlin: Strong presence offshore.
• Black Marlin: Trophy opportunities return.
• Sailfish: Numbers building for the winter run.
• Dorado: Still present in good numbers.
• Yellowfin Tuna: Excellent action.
• Roosterfish: Premium inshore opportunities.
• Snook: Quality fish still available.
• Cubera Snapper: Good bottom fishing action.

Fishing Methods and Locations

To conquer the diversity of the Southern Costa Rica fishing calendar, our charter boat is equipped for every scenario.

Offshore Tactics

• Trolling lures and ballyhoo for billfish.
• Live baiting with slow-troll techniques for tuna.
• Running and gunning for dorado schools under debris lines.
• Deep dropping for bottom species like snowy grouper.

Inshore Techniques

• Live bait presentation for trophy roosterfish.
• Popping and jigging for aggressive cubera snapper.
• Sight casting in river mouths for snook.
• Vertical jigging along the deep rocky points.

Prime Southern Fishing Locations

Our success is tied to the unique geography of the region. Click here for a full breakdown of our secret spots.

• Matapalo Rock: Famous for world-record class roosterfish and cubera snapper.
• Golfo Dulce: Protected waters ideal for targeting multiple species in calm conditions.
• Offshore Banks: Productive seamounts for high-intensity billfish and tuna action.
• River Mouths: Prime habitat for snook and even seasonal tarpon.

Southern Costa Rica Fishing: Expert Intel & FAQs

If I only have one week, when should I pull the trigger?
For the “Grand Slam” (Marlin, Sailfish, and Tuna), book between December and April. For a broader look at how our region compares to the rest of the country, check out this regional Costa Rica fishing calendar.

Can I catch a “Dinosaur” Roosterfish year-round?
You bet. Roosterfish don’t migrate; they stay right here patrolling Matapalo. Check out our Inshore Species guide to see what else is lurking.

SOUTHERN WILD FUN FACT!

The Deepest Secret in the Tropics: The Golfo Dulce is one of only four Tropical Fjords on Earth. Because the water drops to 700+ feet deep just yards from the shore, you can catch a 100lb Sailfish while watching monkeys in the trees!

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