Illimani (6439 m). Prestigious ascent of the Bolivian giant, 28 - 30 May 2025.
Haven't been posting much (read: nothing) on the portal lately, and the reason isn't a lack of interesting routes - simply with a ton of work, time flies by and turns current into past.
This time it's worth making an exception. After successfully breaking the magical 5000m barrier last year in the Georgian Caucasus with my partner, we set a goal one step higher and planned a (work-)touristic-mountaineering trip to Peru and Bolivia with an ascent of a six-thousander at the end. Based on gathered info, the well-known and popular Huayna Potosi (6088 m) seemed most suitable - I didn't even think of the famous Illimani, champion of Cordillera Real. But sudden changes are sometimes very welcome.
After 11 days of tourist wandering and simultaneous acclimatization to the thinner air of Andean heights, where we exceeded five thousand once and four thousand several times, mostly staying at altitudes between good 3400 (Cusco) and 3870 m (Puno), it was time for the trip's highlight, ascent of one of the six-thousanders from La Paz. The latter is one of Bolivia's capitals and a city that with its less prestigious historical bedroom, now independent million-strong El Alto, with average altitude from cca. 4050 m onwards the world's highest-lying large city, forms the central metropolis of the Andean highlands.
Mountaineering is big business in La Paz; if in the Peruvian counterpart Cusco tourist offerings are primarily tied to discovering Inca heritage and easier mountain walks, the somewhat more chaotic La Paz is the starting point for many more adrenaline-fueled or grand endeavors like downhill mountain biking on the "Death Road" or ascents of Bolivia's highest peaks including Sajama, Illimani, Illampu and finally Huayna Potosi. The latter, due to proximity to La Paz, six dedicated mountain huts below it, and relative straightforwardness and ease of approach, is undoubtedly the most popular six-thousander in the wider area, if not the entire Andes, and numerous city travel agencies compete to bring more clients to the summit, who tackle the mountain in groups of fifteen, and the summit reportedly sees up to a hundred people on best days.
We didn't fancy joining guided masses at all, as we had full mountaineering and expedition gear with us, logistics for independent ascent were quite complicated, and we didn't have time for more than one such high-altitude trip - and so based on suggestions from local guides the die fell on a much more ambitious and prestigious goal: Illimani, "guardian of La Paz", which features in the background of every panorama of La Paz and El Alto, the highest peak of Cordillera Real and Bolivia's second highest after Sajama.
Regardless of route choice, ascent of Pico Sur, the highest summit of the massive mountain with numerous spurs, is a demanding and grand undertaking, which due to access complexity (including five-hour drive with 4x4 on deadly sheer proverbially destroyed Bolivian roads), expedition requirements and difficulty of the final ascent without long preparations is practically impossible to tackle privately; like all others with recorded ascents we heard of or met, we hired a local guide in La Paz for the ascent. This is currently especially favorable for Europeans due to sad conditions and financial crisis in Bolivia, as euro value more than doubles on exchange; worth considering returning at least part to the poor local community. Unlike larger agencies offering more comfort, porters and varied food, we chose a smaller family agency with excellent guide German, who proved himself with guiding experience and terrain knowledge; due to highlighted personal experiences and prior equipment, we paid substantially lower rate for two than usual, otherwise street bargaining rules here as in most dealings in Bolivia.
While crowds pour onto Huayna Potosi daily, Illimani much more rarely sees an ascent, which among locals is considered especially prestigious.
As for the trip: most opt for three- to four-day packages, we went for three-day. First day after long drive acclimatize at base camp (cca. 4470 m), second day gradual ascent to over a thousand meters higher high camp called Condor's Nest (Nido de Cóndores; and no, no condors seen

). Ascent through fairly varied terrain is mostly easy, only last part steepens with some ridge climbing up to higher I grade (if not picky, we touched poor II); latter mainly problematic due to weight of backpacks with camping gear at significant altitude, but seeing skillful cholitas as porters climbing rocks with big loads in modest footwear gives some extra energy.
High camp sits on flat slab in side ridge with quite limited space, but due to relatively low traffic offers enough room for enthusiasts' tents. Wandering around camp limited due to sheer terrain and icy surface, crampons needed for safe walking.
Summit ascent starts in early morning - night - hours of third day. We started around 1:15 to 1 a.m. after scant rest with no more than half hour sleep in ice-cold night, which showed in upper part of ascent. Initially steep up exposed icy ridge, followed by airy traverse at places to west slope of highest summit. Head to glacier terrain needing much care due to crevasses, and increasingly steeply and exposed up the slope. At cca. 6200 m reach key section, approx. 100m high snow passage known as "heavenly ladder" reaching 45-50° mostly; we got lucky with good conditions, with scant snow difficulty increases significantly here, contributing to many accidents.
After key section easier upper part, but altitude and fatigue from long ascent already strongly felt; partner had much trouble with acclimatization and ascended only at urging of me and guide, my step too despite lack of breathing issues became harder due to sleeplessness and altitude and with increasing effort we slowly dragged to summit. Ascent usually takes six to nine hours; we stood on summit just after sunrise after about six and a half hours walking as first ascenders of the day. Despite exhaustion and biting cold, feeling on sheer summit with indescribable views in clear day was ecstatic. Stayed on top about half hour. Already heavily spent I then led the group in a state of grumpy half-awakeness through demanding terrain to high camp, which we reached at 11 a.m. with utmost efforts; meanwhile sun started burning on frostbitten bodies, weakening them further and slowing step. After short break packed tents and set off to base camp, me still in near dream state; descent long but without issues. Back to La Paz and well-deserved beer in evening hours, recovery lasted until enjoyable descent of Death Road as last act in Bolivia two days later.
In conclusion, as probably evident from text, this ascent is a serious and grand undertaking requiring much experience, adaptation and prior acclimatization, at least basic alpinism knowledge needed. Ideal to ascend Huayna Potosi or at least some easier 5300 m+ peaks beforehand for high altitude familiarization and psychophysical prep, many of which (e.g. Chacaltaya or Pico Austria) tourist agencies in La Paz guide for modest 10-25 euros. We didn't have time for that, but I was relatively well acclimatized due to long prior stay at 3300 to over 4000 m with some higher ascents, including tourist ascent of Rainbow Mountain over 5000 m.
Finally some drier data:
- current conditions in Bolivia - at least La Paz and countryside - despite upheavals still quite safe, avoid El Alto or Santa Cruz de la Sierra, which is general rule anyway. Peru much more hospitable and one level better organized, though with its peculiarities;
- to acclimatization greatly helped numerous tourist ascents on first visit: Humantay lake with ascent to high point in ridge above (~4300 m), exploring Inca ruins above Cusco to cca. 3900 m and unbearably popular mass-visited ascent of 5036 m Rainbow Mountain (Vinicunca), after which with easy climbing (I, following guanaco tracks) I reached viewpoint near 5060 m. Red Valley nearby very worth visit. In between descended to Machu Picchu and ascended airy popular Huayna Picchu (2693 m) above it, but didn't negatively affect altitude readiness much;
- very need to be careful with water and food use in both Peru and Bolivia; I suffered certain health issues most of trip, including digestive problems and sore throat. On Illimani ascent due to cold reaching -15 with occasional strong wind gusts, despite multiple gloves and socks got frostbite on one finger requiring ER visit back in Slovenia, and some time needed to restore toes mobility. Precisely cold besides moderate technical difficulty and altitude is one of main challenges of Illimani ascent;
- though high season in Bolivian highlands runs June to September, i.e. Andean winter south of equator, conditions for ascent already end of May in dry weather quite optimal with substantial snow, which there starts around 5500 m usually, and still relatively long days. Oh yeah, it was cold.
Trip that started with swim in Pacific at Lima ended with enjoyable Death Road descent, felt like reward for successful Illimani ascent; latter will likely long remain personal mountaineering milestone.
PS: fewer pics this time due to night ascent, effort to keep fingers and cold draining phone batteries almost empty on summit.
PS2: bit on mountain height. Various sources give Pico Sur as Illimani highest 6438, 6439, 6442 or even 6460 and 6462 m, latter too much. I followed official maps all advocating "modest" 6439 m; personal altimeter showed 6442 m.