Can You Swim in Rio Celeste? Tenorio Park Rules, Stairs and What to Wear (2026)

⭐ The short answer: Not inside the park. SINAC, which runs Tenorio Volcano National Park, does not let visitors enter the river at the waterfall, the Laguna Azul, the Teñideros or anywhere along the trail. You can swim in the Rio Celeste outside the park boundary, at a public spot by a road bridge, on private riverside land, or on a tubing trip.

So can you swim in Rio Celeste? Yes, just not where the photos of the waterfall are taken. The famous 3 km Misterios del Tenorio trail stays on the bank the whole way, and the rule is posted by SINAC in four words on its official page for the park: "No se permite ingresar al río" (entering the river is not allowed). It covers the plunge pool under the waterfall, the small, intensely blue Laguna Azul, the bubbling Borbollones and the Teñideros, the spot where two clear streams meet and the colour begins.

Downstream of the park, the river runs through farms, villages and lodges around Bijagua and Río Celeste, and the water stays turquoise for kilometres. That stretch is where every swimming photo you have seen from a La Fortuna day trip was taken. If you are still deciding whether to go at all, our Rio Celeste hike guide covers the trail, the drive and the guided tours. This page covers the rules once you are there, and where you can legally get in the water.

SINAC does not publish a single paragraph explaining the ban, but the reasons are easy to see on the trail, and they are the same ones rangers and recent guides give.

The water is volcanic, and in places hot

The Borbollones are, in SINAC's words, fissures where volcanic gases escape "a alta temperatura". One of the two streams that meet at the Teñideros is acidic, which is part of why the colour forms at all. A guide updated in October 2026 notes that the Borbollones section runs dangerously hot. This is not a place to wade in barefoot.

Sunscreen, repellent and 1,200 people a day

SINAC caps the park at 1,200 visitors a day, with up to 500 on the trail at once. The same October 2026 guide cites sunscreen and lotions as a threat to the river's mineral balance. Multiply one swimmer's sunscreen by a few hundred a day and the logic of a blanket ban is obvious.

Floods, falling branches and a damaged staircase

Tenorio gets about 3,500 mm of rain a year, according to SINAC, and the park has closed several times recently for weather: from May 30, 2025 after heavy rain brought down branches, and again on July 18, 2025 for rain, wind and flooding. A river that rises fast after a storm is not one the park wants people standing in.

Older blogs and maps that show people in the water at the waterfall pre-date the current rules. The trail is a single path with ranger checks at the entrance, so plan on staying on the bank.

The Rio Celeste keeps its colour for kilometres downstream of the park, so there are four legal ways to get in it. All of them are outside the park boundary, all depend on the water level that day, and none involve the waterfall.

The free public spot is the one to know if you are driving yourself. A guide updated in October 2026 places it about 1 km past the park entrance and suggests searching for "Rio Celeste Danta Free Pool" on a map app. Guests on tour days describe it plainly: the swim is "outside the park, under a bridge", in a river that is clear blue but cold. It is a river, not a pool, so watch your footing on the rocks and stay out after heavy rain.

On tours, the swim is where expectations go wrong. Two guests this year said they expected the turquoise pool from the advertising photos and got a road bridge instead, and one wrote the stop lasted "about 20 minutes". Tours that use a private stretch get better reviews for it: a guest on Arenal Jungle Tours' hike in November 2025 said they swam "on private property which was so great because we were the only ones there". On wet days, guides cancel the swim; two guests in late 2025 had theirs called off for rain, one citing the risk of flash flooding.

Our take: If getting into the blue water matters more to you than the waterfall, book tubing, not a hike. A float spends one to three hours in the river, while a hike tour gives you half an hour at most. Our Rio Celeste tubing guide compares the operators. And if you just want a waterfall you can swim under, our Rio Celeste vs La Fortuna Waterfall comparison explains why the La Fortuna fall is the better pick.

These are the Tenorio National Park rules as SINAC lists them on its official page for the park, checked on October 27, 2026, with the gaps filled from 2025 and 2026 government notices and visitor guides where SINAC says nothing.

ℹ️ Rules checked against SINAC's page for Parque Nacional Volcán Tenorio on October 27, 2026. SINAC closes trails at short notice in bad weather, so check the park's official channels the day before.

Can you fly a drone at Rio Celeste?

No. Drones are on SINAC's banned list for Tenorio, and the ban covers the whole park, including the waterfall and the Teñideros. Outside the park, Costa Rica's civil aviation rules (set by the DGAC) still apply. If you want aerial shots of the river, ask a lodge or tubing operator outside the park whether flying over their land is allowed.

The staircase down to the Rio Celeste waterfall has about 250 steps. Recent guides put it at 250 to 253, and one tour guest in December 2025 estimated "approx 300 steps down to waterfall viewing area", which is what it feels like on the way back up.

The bigger news is that you cannot currently walk all the way down. Storm damage in 2025 took out the lower stairs and the viewing deck at the bottom. The park closed on May 30, 2025, and on June 13, 2025 MINAE and SINAC, through the Arenal Tempisque Conservation Area (ACAT), reopened the staircase only halfway, after a risk assessment by Costa Rica's national emergency commission (CNE). ACAT's regional director said access would be restricted and evacuated immediately in heavy rain.

We found no announcement of a full reopening since. Guests in 2026 still describe stopping partway down: one in August 2026 wrote that the stairs "now only go about halfway down, and only a handful of people are allowed on the platform at a time", and another in March 2026 said you "wait in a very long line just to take pictures". The view from the midway platform is still good, but it is a side view of the fall, not the face-on shot from the old deck.

How hard is it?

The steps are the hardest part of a 6 km round trip that SINAC says takes about three hours. They are steep, irregular and wet for much of the year. Guests consistently call the rest of the trail manageable for anyone who walks regularly, then single out "the steep steps after the waterfall" and the climb back from the Teñideros as the parts that hurt. Take them slowly, use the handrail, and let faster walkers pass.

For what to wear to Rio Celeste, dress for mud and rain first: shoes with real grip or rented rubber boots, quick-dry clothing and a rain jacket. SINAC recommends comfortable clothes and footwear and sets no dress code. Wear a swimsuit underneath only if your day includes a river stop outside the park.

The mud is the thing people underestimate. Tenorio sits on the Caribbean side of the Guanacaste volcanic range, so it rains here almost all year, even in the months when Guanacaste's beaches are bone dry. One guest wrote that a walking stick "can be of good use" on the slippery sections, and another recommended "keeping hiking shoes on until you get to the water" because the path down to the swimming spot is rocky.

Because the colour is a trick of light that rain can switch off. A 2013 study in the journal PLOS ONE by Castellón and colleagues found no copper, iron or other coloured minerals in the water. Instead, at the Teñideros, a clear stream carrying tiny aluminosilicate particles meets a clear, acidic stream. The drop in pH makes the particles clump to around 566 nanometres, a size that scatters blue light back at you, much as the sky does.

That effect needs the particles to stay evenly suspended in clean water. Heavy rain washes mud and sediment into the river and the colour turns milky grey or brown until it clears. After seismic activity in 2018 caused landslides upstream, the river ran brown until the sediment settled and the colour came back.

When is Rio Celeste blue?

Most reliably in the drier months, roughly February to April, and on mornings after a dry night. How fast it recovers after rain is disputed: one October 2026 guide says the colour usually returns within a few hours after rain stops, while guests on tours keep reporting grey water the day after a storm ("the water was not blue when we went due to the heavy rain the day before", one wrote in July 2026). Ordinary light rain rarely spoils it, and plenty of green-season visitors still see vivid blue. Our best time to visit La Fortuna guide and our La Fortuna rainy season guide cover the rainfall month by month.

Yes, most school-age children can, and the park charges a reduced child fee for ages 2 to 12 (under 2s are free). The issue is not distance but the steps and the length of the day. The trail is 6 km round trip, and the about-250-step staircase and the climbs near the Teñideros are where small legs give out.

What families in guest reviews report:

• It works for active kids: one family did a guided hike "with 3 kids 7, 8 and 10 and loved it"; another parent said their "5 y/o was able to manage".
• It is hard on reluctant walkers: one guest warned the hike is "NOT easy on small kids, or kids that are not active", and another did not recommend bringing young children at all.
• Lunch comes late: on some tours lunch is not served until around 3 PM. A February 2026 guide says rangers make an exception to the no-food rule for young children, so pack snacks.

Tour age rules differ. Arenal Jungle Tours prices children from 3 but recommends its hike from age 12; Red Lava TSC has a child rate from 5. A baby carrier is more practical than a stroller on the stairs. For gentler ideas, see our guide to the best things to do in La Fortuna with kids.

As of October 27, 2026, SINAC lists Tenorio Volcano National Park as open every day, with entry from 8:00 AM to 2:00 PM and visitors allowed to stay until 4:00 PM. There is no weekly closing day, but the park closes at short notice for storms. Entry for non-residents is $13.56 per adult and $5.65 per child, tax included (often quoted as $12 and $5 before tax). Tickets are sold online only, in timed entry windows, and dry-season slots sell out. Parking is private and paid separately.

Our Rio Celeste hike guide covers booking the ticket, driving there and the guided tours in full. If you are staying on the Pacific coast, see our Rio Celeste tours from Tamarindo instead.

Nine options, all rated 4.5 or higher with at least 50 reviews and guest reviews from the last six months. The first three are full-day hikes from La Fortuna that visit the park and stop for food (two of them include a river swim; Sloth Land CR's day adds a sloth sanctuary and a coffee and chocolate farm). The other six are tubing floats outside the park, the longest time you can legally spend in the blue water. Most tubing trips meet at the river, about 1.5 hours from La Fortuna, so you need your own car or a transfer.

For the rest of your stay, see our guide to the best things to do in La Fortuna.

Staying in La Fortuna or planning a trip? Here are three well-reviewed hotels, with live prices from our booking system. Rooms at the best-rated hotels are usually the first to go, especially in peak season and over holidays, so it's worth locking in your stay before availability fills up.

The rules on this page come from primary sources first: SINAC's official page for Parque Nacional Volcán Tenorio (rules, hours, capacity and fees, checked October 27, 2026), the June 2025 MINAE and SINAC notice on the partial reopening of the waterfall staircase, the 2025 park closures reported by Costa Rican press, MINAE and SINAC's March 2025 reminder of the single-use plastics ban, and the 2013 PLOS ONE study on why the river is blue. Where SINAC is silent (food, boot rental, the public swimming spot), we used visitor guides updated in 2026 and say so in the text.

For the on-the-ground detail (the swim stops, the staircase queue, kids on the trail, rain and colour) we read about 450 recent guest reviews of three Rio Celeste hike tours. Tour ratings, prices and inclusions come from live listing data checked on October 27, 2026, and every tour shown has a rating of 4.5 or more, at least 50 reviews and reviews from the last six months. Rules change, so confirm anything critical with the park or your tour.