Table of Contents
Most people planning a Costa Rica fishing trip ask one question: “Is the fishing good?” The more useful question is: “Good for what, and when?”
On Costa Rica’s Central Pacific coast, the answer to both parts of that question changes significantly depending on the month, which is what makes this region one of the more nuanced sportfishing destinations in the world to plan a trip around. The marina fishes year-round — there is no true off-season here — but the species available, the sea conditions, the number of other anglers on the water, and even the accommodation rates shift considerably across the calendar. Understanding those shifts is what separates a well-planned trip from one that misses its window.
Knowing which species peak when, how sea conditions shift between seasons, and what that means for the rest of your trip — including the Los Sueños tours and other activities available in the area — is the kind of detail that tends to separate a well-timed visit from one that missed its window.
Why Los Sueños Fishes Year-Round
The Central Pacific coast’s consistency stems from geography. The Central Pacific coast’s consistency stems from geography. Herradura Bay’s sheltered position protects it from the strong Papagayo winds that make fishing difficult on the Northern Pacific coast from December through April. While Guanacaste anglers deal with 20–30 mph winds and choppy conditions during that same period, the Central Pacific stays calm.
Deep water is also unusually close to shore along this stretch of the Central Pacific, which means shorter runs to productive offshore grounds. That proximity matters for both efficiency and comfort — particularly during the green season when afternoon weather can turn quickly. Most boats are already on their way back before conditions become an issue.
The result is a fishery that produces year-round — but with distinct peaks for different species, each worth knowing in detail.
The Dry Season: December Through April
Costa Rica’s dry season, known locally as “verano,” runs from December through April. On the Central Pacific coast, this means clear skies, calm seas, water temperatures hovering in the mid-80s Fahrenheit, and the most consistent offshore conditions of the year. It’s also peak tourist season, which has practical implications for planning.
Sailfish are the defining species of this window. January, February, and March are widely considered the strongest months for Pacific sailfish out of Los Sueños, with multiple releases per day per boat a realistic expectation during peak action. Sailfish travel in groups and respond aggressively to bait-and-switch tactics, which makes multiple simultaneous hook-ups genuinely common. The Los Sueños Signature Triple Crown Billfish Series — one of the most competitive sportfishing tournaments in the region — is held across three legs in January, February, and March specifically because of this concentration of fish.
Striped marlin also make appearances during the dry season, adding variety to offshore days that are already producing good numbers of sailfish.
Roosterfish are strong inshore from December through March, making the dry season a reliable window for anglers who want to split their time between offshore and nearshore fishing. Roosterfish are non-migratory and hold close to structure, so their availability is less weather-dependent than the offshore pelagic species — but December through March tend to produce the most consistent results.
Mahi-mahi peak from January through April and can provide excellent action for anglers looking for a species they can also bring to the table. Unlike billfish — which are strictly catch-and-release under Costa Rican law — mahi-mahi can be kept and filleted by the charter crew for a meal back at the resort.
Charters during the dry season book up quickly — particularly around the January, February, and March Triple Crown tournament legs — and accommodation rates reflect the demand. For travelers with some flexibility, November and late April offer a practical middle ground: conditions are still favorable, the sailfish are either building or still running, and both boats and accommodations are easier to secure.
The Green Season: May Through November
The green season brings afternoon rainfall to the Central Pacific coast, and with it a shift in both the fishing and the overall character of a visit to Los Sueños. The mornings are typically calm and clear. Rain usually arrives in the afternoon, after most fishing boats have already come in.
What changes most significantly in the green season is which species are available offshore — and for many anglers, the green season is actually the more interesting window.
Yellowfin tuna are the signature catch from May through November and are often found in large schools under spinner dolphins. The action can be fast and physically demanding, and the fish run 50–150 pounds on average during peak months. Unlike billfish, tuna are edible and can be kept, which adds a different dimension to the experience for anglers who want something to show for the day beyond a release.
Blue marlin numbers build from June through August, with September and October staying productive for encounters. Black marlin follow in November and December, right as the dry season sailfish run is getting started. That overlap in November creates an unusual window where multiple marlin species and early sailfish are all in the water at the same time — something that doesn’t happen often in a single destination.
Mahi-mahi remain available through much of the green season, and wahoo add variety to offshore days from mid-year onward.
Roosterfish slow slightly in October as heavy river runoff from the rains muddies nearshore waters, but pick back up in November as conditions improve.
Charter rates and accommodation costs both drop during the green season, and boat traffic on the water thins out considerably. For anglers who care more about fishing quality than guaranteed sunshine, it’s worth noting that many captains consider some of their most productive days to fall during this period — fewer boats means less pressured fish, and that tends to show in the results.
The Transition Months: May and November
Travelers who default to the dry season without exploring the full calendar tend to overlook May and November — two months that hold up better than their reputation suggests.
May marks the end of the sailfish peak but the beginning of the tuna season. Early blue marlin start appearing. The weather is transitioning — mornings remain mostly clear, and afternoon rain is starting but not yet heavy. Charter availability improves, and rates begin dropping. For anglers open to targeting multiple species in a single trip, May offers a genuine mix.
November is effectively the inverse: the green season is winding down, blue and black marlin are still active, sailfish numbers are beginning to build ahead of their December peak, and the rain is tapering off. Boat traffic is light, captains are hungry for productive days, and the fishing window between both major seasons can produce some of the most varied species counts of the year.
Matching Your Trip to Your Target Species
A quick reference for planning purposes:
Pacific sailfish — Numbers peak between January and April and stay strong through June. They’re catchable year-round, but outside that window, they tend to be more scattered and harder to find in consistent numbers.
Blue marlin — Most consistent from June through August and again in November and December.
Black marlin — Peak in November and December during the major marlin migration through the region.
Striped marlin — Dry season, December through March.
Yellowfin tuna — Strong from May through November; often the dominant offshore species during the green season.
Mahi-mahi — Best from January through April offshore; available year-round.
Roosterfish — Year-round inshore; peak action December through March and July–August; slower in October due to river runoff.
Snook — Inshore year-round; best near river mouths.
Red snapper and grouper — Available year-round on nearshore structure.
How Season Affects the Non-Fishing Side of the Trip
The fishing calendar also affects activities beyond the water. The Costa Rica fishing vacation packages available at Los Sueños combine fishing charters with resort accommodations and can be built around any time of year, but the overall experience of the resort does shift between seasons.
During the dry season, conditions are ideal for zip-lining, ATV tours, catamaran day trips to Tortuga Island, and the Tárcoles River wildlife tours that run along the edge of the Carara Biological Reserve. Everything is accessible, the weather is predictable, and days flow smoothly.
In the green season, the same tours still run — operators are experienced with the afternoon rain pattern and schedule accordingly — but itineraries benefit from some flexibility. The upside is that the rainforest is visibly more lush, wildlife activity tends to be higher, and the crowds at popular tour sites are noticeably thinner.
A Note on Fishing Licenses
All anglers fishing in Costa Rica are required by law to hold a valid fishing license. Most charter operators can arrange the license in advance, or it can be purchased at the marina dock on the day of departure. The cost is approximately $15 per person for up to 8 days, though rates may vary by operator and are subject to change. This applies to visitors of all nationalities and is required regardless of the type of fishing — offshore, inshore, or nearshore.
The Broader Point
The instinct to book a Costa Rica fishing trip during the most popular window — December through April — makes sense on the surface. The weather is reliable, the sailfish numbers are strong, and the infrastructure around the peak season is well-developed. But the full picture at Los Sueños is more nuanced. Anglers targeting tuna, marlin, or simply a less crowded experience will find the green season and transition months well worth considering. The fishing doesn’t stop; it just changes.
Knowing which change aligns with what you actually want out of the trip is the most useful thing you can do before booking.