Alto de Letras Bike Climb - PJAMM Cycling

50.5 mi
14,526 ft
4 %


Page Contributor(s): Luke Hise, Phoenix, Arizona, USA


Cycling Alto de Letras, Colombia - at  81.3 kilometers this is the third longest bike climb in the world behind #1 Mauna Loa, and #2 Wuling Pass East.  This is one of the greatest bike climbs in the world and worth traveling to Colombia to do. 
This climb is about grade and altitude.  We have 3% less oxygen for every 300 meters of altitude gained during a ride.  At the top of Alto de Letras we have 36% less oxygen than at sea level.  The 4% average grade for the Alto de Letras bike climb is also terribly misleading - the true average grade after eliminating about 1,200 meters of descent on the climb is a daunting 7.5%.  27% (22 kilometers) of the climb is descent, 28% (22.3 km) at 0-5% grade, 26% (21 km) is at 5-10%, 13% (10.6 km) is at 10-15%, and 3.8% (3 km) is at 15-20%. 
Roadway:  Good shape.

Traffic:  Mild to moderate.

Parking  Do not do this climb without support - not only does it take a long time to ride 80 kilometers gaining 4,400 meters, you also have to climb 1,200+ meters on the way back - that makes for a long day (see Full Summary).  If you are riding unsupported, you can park in town, or ride from your motel in Mariquita as we did. 
Provisions:  There are many roadside fruit stands and stores or cafes along the route. 

Weather and Clothing:  You are finishing at high altitude 4,000 meters above your starting elevation.  Therefore, be sure to consult the PJAMM "Full Forecast" feature for the time you expect to arrive at the finish to assess what clothing to bring on your ride.

SAG:   We rode this one unsupported but recommend support. We have used the services of Colombia Bike Tours and they are magnificent - we vouch for them and will use their excellent services again when we return to this incredible cycling country.
Before heading out on any cycling adventure check out our Things to Bring on a Cycling Trip and use our interactive check list to ensure you don't forget anything.
Stay in Mariquita before you ride.  We stayed at Hotel Brisas La Gavota and highly recommend it.  We also recommend consulting Colombia Bike Tours before your trip as they may provide SAG for you. 



Difficulty: Extreme



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Aug 12, 2021
difficulty: Extreme
scenery: 5
traffic: 3
road: 5
Aug 12, 2021
scenery: 5
traffic: 3
road: 5
Epic climb! Beautiful scenery. Best to enlist the services of a local touring company for knowledge and support. I used Altos Cycling - great touring outfit out of Manizales. Early start (~6am) is best to escape the heat of Mariquita. I also found it best to break the climb up into segments of 10km vs segments of 10 mi. (I changed my computer settings to metric for the climb). Layers are essential (inc. rain gear) -- the cold and rain as you near the top can make you very cold FAST! At arrival, the town of Letras has plenty of places to warm your bones with the local aguapanela or hot chocolate.

Climb Profile Not Found


Climbed by PJAMM on 9-12-17

50.5 miles (third longest bike climb in the world)

#1 Mauna Loa, USA (62.2 miles); #2 Wuling East, Tawan (54.3 miles)

And the top two adjectives to describe this climb are:   Long and Lush.  

See also - Luke Hise, Phoenix, AZ, USA Summary Here.

Beginning of Alto de Letras road bike climb - Mariquita.

We stayed at a very nice hotel in Mariquita -

 Hotel Brisas La Gaviota - highly recommended.

Luke Hise also has a recommendation from his stay:  We stayed in the Casa Marilla, Casa de Huespedes ( in Mariquita. It was without air conditioning but I would recommend it heartily for anyone looking for a more local flavor. The Best Western, this was not. Ha.

Beginning of Alto de Letras road bike climb - Mariquita.

PJAMM leaving the hotel in Mariquita and the start of the climb on Hwy 50, Mariquita.

Beginning elevation 1,585’

 The climb is also very, very long (third  longest in the world behind Mauna Loa from the Kona side and Wuling Pass East).  It is a bit of a trek to get to - we fly first to Bogota (there are many nonstop inexpensive flights from the U.S. and even Europe [Heathrow has nonstop to Bogota], but most travel from Europe requires a layover), then drive 175 km/110 miles to Mariquita where the climb begins.

Photos from Luke Hise’s (Phoenix, AZ) January, 2021 trip.

The roadway is in excellent condition, has a shoulder for the most part and, while it does have a fair amount of traffic, felt safe to us, in spite of the fairly dramatic road warning signs we saw along the way.

Climbing Alto de Letras by bike - roadway and big trucks.

O.k. - there is a bit of traffic along this route.  

 Bicycle ride up Hwy 50 to Alto de Letras - crazy driver sign

Not sure if that is a statement or warning . . . ?

Be prepared for the altitude as this one rises to nearly 12,000’.  Since this climb is generally known (incorrectly) as the longest road in the world, it does get a fair amount of foreign cycling traffic, and rightly so.  However, beware that it is very difficult for an average rider to do this trip in one day as an out and back because its length and because there is nearly 3,000’ of climbing on the way back - it is a 100 miles 15,000’ day riding to the top from Mariquita then back to the start.

Many roadside fruit stands and little cafés along the way.

Much agriculture in this part of the country

Beautiful scenery along the route.

Cattle on Alto de Letras cycling climb Hwy 50

Colombian camouflage . . .

Colombian coffee fields

Riding through the narrow streets of Fresno at km 25

Founded 1574; elevation 1,465 m (4,806’) population 30,750 (2005).

Long and windy road that is very steep in sections.

Finish of Alto de Letras road bike climb

82 km later . . .

John Johnson and Will Plaugher at finish of Alto de Letras bike ride.


We mistimed the our return ride and misjudged the weather

Javier was kind enough to give us a ride back from Fresno.

Steepest Gradients by Distance


We stayed at Hotel Brisas la Gaviota in Mariquita - the hotel is very nice, reasonable priced and just a couple kilometers from the start.  It is down some fairly obscure back roads, so be sure to have good GPS to assist you in navigating to this hotel.

Colombia Bike Tours: if you are interested in a cycling tour in the wonderful country of Colombia -   We have used this company and they are exceptional - we highly recommend using hiring them if you are interested in cycling in Colombia.