Costa Rica is one of the most mountainous countries in Central America. A rugged spine of peaks and volcanoes runs nearly the entire length of the country, from the Nicaraguan border in the northwest to Panama in the southeast. The highest point, Cerro Chirripó, reaches 3,821 meters (12,536 feet), and several volcanic summits top 3,000 meters. Far from flat tropical lowlands, much of Costa Rica’s interior sits at elevations where temperatures drop low enough to freeze at night.
The Main Mountain Ranges
Costa Rica’s mountains are organized into several distinct ranges, collectively forming the country’s central highland corridor. The major ones, running roughly from northwest to southeast, are the Cordillera de Guanacaste, the Cordillera de Tilarán, the Cordillera Central (also called the Central Volcanic Cordillera), and the Cordillera de Talamanca. Smaller formations like the Coastal mountain range and the Herradura and Turrubares hills add further elevation along the Pacific side.
The Cordillera de Talamanca is the largest and highest of these ranges, stretching into Panama and containing the country’s tallest non-volcanic peaks. The Cordillera Central, by contrast, is defined by its massive volcanoes, several of which remain active. Together, these ranges create a continental divide that splits Costa Rica into two very different climate zones: a wet Caribbean slope and a drier Pacific slope. Trade winds blowing in from the Caribbean hit the mountains and are forced upward, cooling and releasing moisture as rain and cloud cover on the eastern side.
Volcanoes Along the Ranges
Costa Rica has 10 volcanoes that have erupted during the current geological epoch, and four of them have been active in the past few years. Poás erupted as recently as 2025, Rincón de la Vieja in 2024, Turrialba in 2022, and Arenal in 2010. The remaining six, including Irazú (last eruption 1977), Miravalles (1946), and Barva (around 6050 BCE), are currently dormant. All of them are composite volcanoes, the classic steep-sided cone shape.
Irazú is the tallest volcano in the country at 3,436 meters (11,273 feet). Its summit crater periodically fills with a striking turquoise or green lake that appears and disappears over the years. The crater was dry through much of 2010, then water returned by late that year, forming a shallow blue-green lake. Irazú is also one of the few high-altitude volcanoes in Central America that you can reach by paved road, making it accessible without a serious hike.
Cerro Chirripó: The Highest Peak
The country’s tallest mountain is Cerro Chirripó at 3,821 meters (12,536 feet), located in the Cordillera de Talamanca. It is not volcanic. The summit sits within Chirripó National Park, which is managed by Costa Rica’s national conservation system (SINAC). Reaching the top requires a multi-day hike, and you need a permit and reservation in advance. Entry costs $18 for foreign visitors. Lodging and gear transport near the summit are handled by a local consortium called Aguas Eternas, so hikers don’t need to carry everything themselves.
The park opens daily at 8 a.m., and reservations can only be made Monday through Friday, excluding holidays. The trail climbs through several distinct ecological zones on the way up, from dense tropical forest at lower elevations to wind-swept, treeless terrain near the summit that resembles landscapes more typical of the Andes.
What the Climate Is Like at High Elevations
Costa Rica’s mountains are cool to cold, a sharp contrast to the warm lowlands most visitors picture. Above 2,000 meters (6,600 feet), temperatures drop significantly. At Irazú Volcano around 3,060 meters, average temperatures hover between 8.5°C and 11°C (47°F to 52°F) year-round, with overnight lows regularly dipping to around 4°C (39°F). Above 3,500 meters, freezing temperatures can occur any night of the year.
Rainfall at these elevations is heavy and persistent. At Irazú, precipitation peaks from September through December, and rain falls on 22 to 28 days per month during the wettest stretch. Even the driest months see rain on 12 or more days. Temperature drops about 0.6°C for every 100 meters of elevation gain, so hiking from lowland to summit means passing through roughly 15°C of temperature difference over the full range.
Cloud Forests and High-Altitude Ecosystems
The mountains create the conditions for one of Costa Rica’s most distinctive ecosystems: tropical montane cloud forest. As Caribbean trade winds hit the Cordillera de Tilarán and other ranges, the air is forced upward, cools, and condenses into persistent cloud cover. This keeps the forest enveloped in mist for much of the day, supporting dense growths of mosses, ferns, orchids, and epiphytes that cling to every surface.
On the slopes of Volcán Barva, researchers have documented a full elevational gradient from lowland tropical wet forest at 130 meters up through premontane and montane forest, reaching upper montane cloud forest near the summit at 2,830 meters. The terrain is extremely rugged and largely roadless, with closed-canopy forest covering every elevation. This unbroken forest corridor is one reason Costa Rica’s mountains harbor such high biodiversity.
The Cordillera de Talamanca is particularly rich in species found nowhere else on Earth. The high-altitude grasslands at the top, called páramo, are restricted to just a few peaks in the region and contain an extraordinary concentration of endemic plants. Many endemic species are confined to a single mountain summit. Among amphibians, six species live only in the Talamanca range, including the endangered Splendid Poison Frog. UNESCO recognized the Talamanca Range-La Amistad Reserves as a World Heritage Site in large part because of this biological uniqueness.
How Mountains Shape Daily Life
Costa Rica’s mountains aren’t just a backdrop. The country’s most populated region, the Central Valley, sits in a highland basin at roughly 1,000 to 1,500 meters between the Cordillera Central and the Talamanca range. San José, the capital, benefits from the mild “eternal spring” climate that this elevation provides, with average temperatures around 20°C (68°F) year-round.
The mountains also define agriculture. Coffee thrives on the well-drained volcanic slopes of the Central Cordillera, and the distinct microclimates on Pacific versus Caribbean slopes support very different crops and farming patterns. The continental divide means that a drive of just a few hours can take you from dry tropical forest on one side to some of the wettest terrain in the Western Hemisphere on the other. For a country roughly the size of West Virginia, the topographic and ecological variety packed into Costa Rica’s mountains is remarkable.