At Charter Fishing Costa Rica, one of the most common questions we receive is: When is the best time to fish for specific species? While our sport fishing opportunities run year-round thanks to Costa Rica’s rich Pacific marine environment, certain months tend to offer clearer patterns of activity for different fish species. Understanding these seasonal trends can help you plan your trip more effectively — whether you’re targeting billfish, dorado, or coastal game fish.

Below, we outline the best fishing months by species based on broad seasonal trends observed in Costa Rica’s Pacific waters, along with typical conditions that influence fish availability.

Sailfish (Oceanic Billfish)

Best months: December through April
Sailfish are among the most celebrated sport fish in Costa Rica, drawing anglers from around the world. During the dry season, calmer seas and clear blue water create ideal conditions for sailfish to concentrate near thermal breaks, making this period the most predictable and productive for sailfish action.

December–January: early peak as dry season begins and sailfish arrive.
January–March: consistent high numbers for multiple releases per day.
April: transition month with still-strong sailfish activity.

This season offers a reliable window for anglers looking to focus on sailfish during their visit.

Marlin (Blue, Black, and Striped)

Best months: May through October
Marlin — including blue, black, and striped varieties — are a hallmark of Costa Rica’s offshore sport fishing. While these species can be encountered throughout the year, the green/rainy season often brings nutrient-rich waters and abundant bait, which help concentrate marlin farther offshore.

May–June: activity increases as offshore prey becomes more abundant.
July–October: considered peak months for marlin, especially blue and black marlin.
November: transition month with ongoing opportunities before the dry season returns.

If your goal is to chase larger marlin or experience multiple shot opportunities, this period is often the most productive.

Dorado (Mahi-Mahi)

Best months: May through October, especially September–October
Dorado — also known as mahi-mahi — are most abundant during the mid-to-late green season, when warm water temperatures and floating debris lines attract schools of these colorful, fast-growing fish.

May–August: Dorado numbers increase with nutrient influx and ocean dynamics.
September–October: often peak months where debris lines and weed lines make mahi-mahi easier to find.
October: Many anglers highlight it as one of the best months for dorado fishing overall.

These months offer a great variety and action, especially on full-day charters.

Roosterfish (Iconic Coastal Species)

Best months: May through November (strong year-round)
Roosterfish are a popular inshore species that can be caught throughout the year, but activity tends to be particularly strong during the green season and early transitions. This is when baitfish movements and clearer tidal conditions bring them closer to the shoreline.

May–August: consistent action as water conditions stay favorable.
September–November: great months for coastal bites close to structure.
December–April: still productive, but often with higher tourism and less bait concentration nearshore.

Roosterfish are a fantastic target for anglers focusing on nearshore structure and sight fishing.

Best Fishing Months by Species in Costa Rica 1

Best Fishing Months by Species in Costa Rica 2

Yellowfin Tuna

Best months: June through September
Yellowfin tuna, prized for their strength and speed, become more abundant during the warmer months of the green season when currents attract baitfish and pelagic predators.

June–August: peak yellowfin availability with strong offshore activity.
September: schools remain active alongside dorado and marlin.

Tuna fishing adds exciting variety to the sport fishing experience, especially when combined with billfish opportunities.

How Seasonality Helps Plan Your Trip

Understanding the best fishing months by species helps you tailor your trip to your priorities:

Want consistent sailfish action? Plan for December–April.
After marlin and other big billfish? Consider May–October.
Love colorful dorado and pelagic variety? September–October is strong.
Into shoreline game fish like roosterfish? May–November tends to shine.

These patterns reflect general seasonal behavior in Costa Rica’s Pacific waters and can be a helpful guide when booking your sport fishing charter.

Plan Your Fishing Trip by Season

Now that you know the best fishing months by species in Costa Rica, choosing the right time for your trip becomes much easier. Whether your goal is chasing sailfish during the dry season, targeting marlin in peak months, or enjoying dorado and coastal species, timing makes all the difference.

Explore our official website to plan and reserve your fishing experience based on the species and season you want to target, and let our team help you design a trip that matches your expectations.

👉 Visit the official Charter Fishing Costa Rica website and book according to your ideal fishing month https://charterfishingcostarica.com/

Martina Fortes

I’m Martina Fortes, a Social Media Manager, Graphic Designer, and Content Producer at Costa Rica Collection. I work alongside hospitality and nature-focused brands, creating visual and written content that reflects their identity and values. My work centers on storytelling, sustainability, and digital strategy, with the goal of translating the essence of Costa Rica into authentic, engaging narratives that connect destinations with people.