The fact that is the highest mountain in mainland Spain provides a big attraction. There have been accidents though especially in the changeable seasons of spring and autumn. If in doubt a mountain guide should always be taken, especially when the mountain is in winter condition.
Spanish Highs Mountain Guides make ascents the mountain most weeks throughout the year. To date they have had over 270 ascents of the mountain, the majority in the winter. The following is a comment from a member of a party from last weeks ascent.
Mulhacen summit
"Well-organized, accommodating, friendly, and experienced guide service. My friend and I did the two-day Mulhacen winter trip. Were lucky to have cooperative weather and a successful ascent with great views but even if we hadn't I still would have felt that the trip was well worth it.Our guide was familiar with several routes and involved us in deciding which option would be best for us. There was enough time allotted in the schedule to allow for flexibility with our pace when one of us was coping with a stomach bug (whose origin was unrelated to this trip).
Despite extreme familiarity with the mountain, our guide never seemed bored (in fact his summit photo looks much more triumphant than my own). Instead, his extensive experience was channeled into teaching us about the location and his apparent enjoyment of the trip added to our own.
Based on this experience, I would definitely feel comfortable planning another trip with Spanish Highs and I would recommend them to anyone seeking some memorably enjoyable and safe mountain time."