Just south of San José, on the border of a town named Aserri, a 30m high boulder jets out of the hillside and is well known by locals due to its prominence on the landscape.

If you wish to visit Piedra de Aserri it is recommended by locals that you do so in a larger group of 5 to 10, stating that theft and muggings have been issues in the past.

The wall

A massive boulder displaying a large white cross on top composes all the routes on a single wall. For most of the wall the bottom 5 meters are vertical and therefore support the majority of the crux moves before the wall leans forward slightly and the climbing turns to slab. The top of the wall has some vegetation that can easily be removed, or avoided. Unfortunately, it would seem that a teenage ritual is to throw garbage off the top of the rock, and therefore some of the vegetation acts as a catch basin for debris. Likewise watch for glass at the bottom of the wall. The view while standing on top of the boulder is worthwhile, and given the accessibility to the top, this is one of the few climbing in Costa Rica where topping out is an option.

The Rock

Unique to any other climbing in Costa Rica, at Piedra de Aserri you will find tons of small knobby rock protrusions that act as both crimps and pinches. As you stand with all your weight bearing down on a knob the size of a black bean, the thought of the tiny protruding rock breaking off commonly drifts through your mind, however the rock is surprisingly strong and of good quality. The texture of the rock is very rough, and finger pads wear down fairly quickly.


The slab nature of the rock provides finger strength moves with key balancing poses.


Being so prominent on the landscape, it is of no surprise that Aserri was one of the first climbing areas bolted in Costa Rica. Relive some of the history and scale the climbs done by the pioneers. Climbs are listed from left to right when facing the wall.


The 30 minute walk up to the rock puts you 30 minutes from your closest food source, so it is best to plan ahead and take some food and water with you. At the base of the approach there is a small super market (point of interest A) where you can get some last minute munchies or some after climbing rehydration. Within the town of Aserri there are also restaurants, sodas, and larger grocery stores.

Things to Remember

Costa Rica, more often than not, is an adventure to climb. Between trekking through jungles, fending off insects, and crossing paths with tropical animals you are sure to have a great day out. Here are a few things to keep in mind when climbing in Costa Rica:

  • Bring extra water. With hot and humid often in the forecast you will drink more water than you may expect.
  • Pack a brush; steel is best. Many climbs can become dirty after the rainy season and if you are climbing something that is friction dependent, you may need to do some spring-cleaning.
  • It gets dark early and fast. This is especially true if you are in a ravine. Pack a headlamp or plan to get out early so that you do not get stuck in the dark.
  • Bring a Spanish-English dictionary, if necessary. You never know when a couple words of Spanish will get you out of a jam.


By Car

Approximate time: 35 minutes

The combination of congestion, one way roads, and nameless streets makes getting to Aserri a challenge to say the least. The best thing to do is to constantly ask locals for directions, first to Aserri, and then once in Aserri, to Piedra de Asseri.

From downtown San José, take Calle Central south until it turns into Costa Rica Highway 214 (which is actually just a regular, busy Costa Rican road). You will come to a roundabout that goes under the highway; continue south on 214. Continue on 214 for approximately 5km where 214 will combine with 209 and become 209 on a single road continuing south. You will pass a cemetery on the right hand side and after another kilometer or so you have reached the town of Aserri. From here it is best to ask a local for directions to the rock.

After passing the church and municipality building in the center of Aserri, continue straight through the next two intersections and then at the ‘Y’ in the road stay left. Drive for another 500m and park at the minisuper (small store or convenience store) on the right side. From here you will walk.

By Bus

Approximate time: 1hour

Catch the bus to Aserri from the center of San José. Ask around for the correct bus stop as the bus goes past the very busy intersection of Calle Central and The Interamericana Highway. Ensure that the Aserri bus you get on is for Barrio Mercedes. Tell the bus driver that you are going to Piedra de Aserri and he will drop you off at the minisuper where you will start your approach.


Approximate time: 20-30 minutes

From the minisuper, where you can already see the rock up on the hill above you, walk north east down the hill on the side of the minisuper. When a dirt road splits off the main road to the left, follow it up a short hill, and then when a smaller trail breaks off to the right up the hill, follow it. This sometimes steep trail will go directly to the base of the rock and will continue to the top of the rock where the white cross is.


Respect the land owners.
They are kind enough to let you use their property for your enjoyment.
Respect other climbers.
Climbing is a community sport where the only opponent is the cruel crux that sends you airborne.
Respect the environment.
Above all, respect the environment. The plants, the earth and the rock itself were here long before you came into existence and will continue to exist long after you are gone. Sustain its survival by treating it properly.
  • Pick up trash, even if it is not your own. Take at least one piece out on every trip.

  • Do not kill flora or fauna, no matter how small or large.

  • Live and climb as though you are organic with your environment.


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Grade Route

From left to right this is the first route on the wall. Start at the base of the left side of the wall under the large sloper ledge. Make the easy moves to mount the ledge and find the first bolt slightly above your head. Continue up the wall on decent holds until the crux at the slight overhang. Finish on the shared anchors with Verdugo.

From left to right, El Verdugo is the second route on the wall and shares the anchors with the above unknown climb. Find the crux where you would expect it, with the overhang near the anchors.

The third climb from the left, Pan Comido is a fun and crimpy route that is a good finger warm up before trying out some of the 5.11’s. Atypical for many of the routes here, the crux can be found almost directly in the center of the climb where you will meet a bit of an overhang and a somewhat burly move for Aserri’s normally delicate personality. If you can find the good hold, the crux move is piece of cake. Post crux, easy, big holds on slab are worked until the anchors up and to the right.

This top rope route goes directly up the wall between the two black water marks. Expect small rock knobs and crimpy pinch climbing for the first half, and then easier slab for the second half. This is quintessential Piedra de Aserri climbing. Meet the crux about a quarter of the way up the route as obvious hand holds become not so obvious.

Find this bolted climb running slightly to the right of the larger black water mark. Start at the dislodged triangle rock at the bottom of the wall, pulling a couple of easy moves to stand on top and clip the first piece of protection. The crux of this particular climb is getting above the first bolt, and once this is accomplished you will find fun knobby climbing until a large ledge that splits the route in half. Continue to the anchors and keep a level head as you runout from the last bolt to the anchors for a little more than 5 meters.

Starting just to the right of the trianglular rock, La Placa is a decent top rope climb that moves up the wall in between El Sombrero and El Diedro. Start with crimpy moves on nearly vertical wall and feet that you need to trust will do their job. If your feet keep good on their responsibilities you will make it to the large ledge. After the ledge the climb turns into slab and small knobs characteristic of Aserri.

This climb starts at the small dihedral to the right of the center of the wall. The first moves are bouldery, fun and technical, making an onsight to this route a real challenge. Once you have reached the first bolt, continue directly up and then slightly to the left for easier slab climbing and then finally the anchors shared with El Sombrero. Keep your nerves intact for the 5 meter run out between the last bolt and the anchors.

Just around the corner of the rock to the right of El Diedro is El Gerrero. This bolted climb offers a bit of variation from the other climbs on the wall. It starts with technical moves on holds other than crimps, however if you miss the crimps and knobs then all you have to do is climb on, and you will find what you have been looking for a little higher up.

There are an additional 4 unidentified routes around the right side of the boulder. More information on these routes needs to be collected.


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