"When should I come?" is the first question we get from almost every angler planning a Costa Rica fly fishing trip. The honest answer: it depends on what you want to catch. Costa Rica fishes well every month of the year — the trick is matching your travel window to the fishery that peaks in it. Here's how we'd plan it, as the people who live here and fish these waters every week.
First, Understand Costa Rica's Two Seasons
Costa Rica doesn't do four seasons; it does two. The dry season (roughly December to April) brings sunny days, low rivers and clear water — Guanacaste, the driest region in the country, is at its most postcard-perfect. The green season (roughly May to November) brings afternoon rains that wake the rivers up, fill the jungle with life and, importantly for anglers, kick off the best saltwater fishing of the year.
Neither season is "bad" for fishing. They're just different — and each of our three fisheries has its own rhythm within them.
Roosterfish: June to October
Our saltwater roosterfish tour peaks from June through October, right in the heart of the green season. This is when the inshore water off Guanacaste comes alive: roosterfish patrol the sandbars and island edges in shallow, visual water, with tuna, jacks, needlefish, snapper and even sailfish crashing the same bait. Come in September or October and you'll almost certainly share the water with humpback whales.
Guapote: Year-Round, Best in Clear Water
The rainbow bass float on the upper Tempisque is our most flexible trip: guapote live in the river all year. What changes is water clarity — the float fishes best when the river runs calm and clear, which is most reliable in the drier months. If your trip lands between December and April and you want a world-class freshwater trophy, this is your day.
Machaca: Follow the Fruit
The machaca fishery on the Corobicí and Bebedero runs on a wonderfully strange clock: fruit fall. Machaca feed on fruits and flowers dropping from the riverside canopy, so the fishing peaks whenever the trees along the river are producing — and when it's on, the topwater action is absurd. Ask us what the trees are doing during your dates; it's the kind of local intel that makes or breaks this trip, and exactly the reason you fish with locals.
The Cheat Sheet
| Your travel window | Fish this |
|---|---|
| December – April (dry season) | Guapote float in prime clear water; machaca when fruit is dropping |
| May | Transition month — rivers waking up, early saltwater action |
| June – August | Roosterfish prime time; combine with a river day |
| September – October | Roosterfish + humpback whales; the full Guanacaste show |
| November | Quieter month — good river options, ask us about conditions |
Our Advice: Don't Pick One
The best Costa Rica fly fishing trips we guide are combinations: a saltwater day for roosterfish, a float for guapote, a topwater day for machaca. The fisheries are close enough together that a three-day fishing window covers all three — something very few destinations anywhere can offer.
Tell us your dates and we'll tell you honestly what will be fishing best. That's the whole point of going local.