Reading from agencies’ websites, this is not the normal route up Chachani, but it is neither an obscure route. We met one guided group and two locals. I named it "Northern scree route" since it climbs almost from directly North on a scree. Please comment if you know another name.
This is a hike and not a climb. It is achievable by fit and acclimatized hikers without previous mountaineering experience, like the Azufrera route. It can be done in one or, more often, two days.
See the mountain’s main page. Agencies say that a high clearance vehicle is required, but with some off-road driving skills, a normal car can get to the trail head. Do not expect any taxi driver to accept such task.
From Arequipa, follow the road between El Misti and Chachani and turn left at the Reserva Nacional Salinas Y Aguada Blanca sign until S16°10.507’ W71°26.187’. Alternatively, follow the road West and North of Chachani, and turn right to reach the same spot. It is 9.2 km horizontally and 1000 meters vertically from the trail head. Follow a dirt track West and keep right at a fork at 1.7 km. The left track will lead to the Azufrera trail head. The track ends at the trail head on a col at 5094 meters. Camping is possible there, but go slightly further to avoid the high winds that blow through the col.The drive took us 2 hours, driving Peruvian style…
From the col, a well-worn trail heads WSW, descending to 5048 meters.
After 1 km, the trail meets a 200-meter-wide talus. Some signs painted on the boulders guide hikers, but feel free to route find, keeping the same general direction. This scramble will definitely drain some energy.
From the campsite, a scree is visible SSW, with a rocky ridge on its right and another scree partly visible behind. Take mental note or a picture!
The 2.5 km approach took us 1 hour 40 minutes, with full camping gear.
An alpine start is warranted if there is snow. Else, enjoy more sleep.
We were told to be on the road at 1 am and out before noon even if there was no snow, the afternoon heat being the reason. The truth is that they will bring the next day’s hikers in around 10:30 am, so they want to minimize their drivers’ and cars' downtime. Clever. We left at 3:20 am, but only because I wanted to see some Arequipa in the afternoon in my short 40-hour passage in Peru.
Between 5300 and 5350, I “lost” my friend for altitude sickness and soon after the trail. Should you get lost too, look up and aim to the right of the highest visible point. I found a trail back at 5700 meters, 1.8 horizontal km from camp, but I cannot confirm a continuous link from 5350 meters (there is probably one).
The trail ascends close to a ridge and traverses left (East). There is some exposure here. On scree or dry snow, the traverse is easy; on ice or wet snow, this is the technically hardest part of the climb, but is short.
Get up the ridge, which becomes the crater rim. The summit can now be seen on the opposite side. Head down around the crater, which was beautifully decorated with penitentes when I was there, and walk up the final slope.
The 2.7 km ascent took me 4 hours. The guided group I met took 5.5 hours. One local made it in 3 hours…
The same way as the ascent. Wet snow can be tricky after sunrise, but may allow glissading. Watch for rock fall if glissading on scree and warn downhill climbers.
The 2.3 km descent took me 1 hour 5 minutes doing some semi-glissade on the upper slope and some scree-skiing on the lower slope. Expect 1.5 to 2 hours if walking.
The 2.4 km return to the trail head took us 1 hour 10 minutes.
Total vertical: +1079m, -85m
In early October 2016, my feet never touched snow (except for the fun of kicking a penitente!). Crampons and ice ax are required if there is significant snow.
Sand stakes may be overkill, but having some rope to tie the tent to rocks is wise as the ground is loose on the campsite.
If you climbed on snow, congratulations, you just did some mountaineering! If you climbed on scree, you now hate scree. I now hate scree.