Spring trek of the Toubkal Circuit?

Is April/May too early for the Toubkal Circuit Trek?

I'd recommend aiming for the first week of May. In April, the high passes, Tizi Oussem and Tizi Likemt, often still have significant snow, which can make the traverse difficult and sometimes unsafe without technical winter equipment. By early May, conditions are usually much more stable and ideal for completing the full circuit.