Tenerife is a wonderful island. Some parts are usually crowded with tourists as the Canaries are a very popular subtropical getaway for people from continental Europe (especially in winter) but there are still large areas of beautiful pristine nature to be found there too. Yes, I have been to Mount Teide, it is an epic hike. The mountain is surrounded by the Del Teide National Park, a spectacular place. I am sure you guys would love hiking the Tenerife mountains. Here are two shots I took on the top and just below the top of Del Teide ;)
Wow. Truly magnificent shots.
Sounds like spring is the best season to hike? But winter is possible ...
I would say spring to fall is all good. In winter, you can have snow in the mountains, from some 2,000 m (6,560 ft) up. I will never forget how I was swimming in the ocean in Puerto de la Cruz in October, enjoying some 30°C (86°F) outside temperature while actually looking at the peak of Del Teide far up in the distance that was covered with snow already. Incredible experience.