Univoltine to multivoltine (depending on location). In northern Africa, the species is multivoltine, with a peak activity period in April and May
On the island of Crete, the species is clearly univoltine, with a flight period in the Autumn, with records from late September into October (and quite probably later).
Jacobi & Suárez (2018) note that Colletes perezi is active in autumn only on Crete and seems to be strictly coastal (Frommer & Kuhlmann 2009, Devalez pers. comm.), while it is active nearly year-round in Northern Africa and distributed inland as well as on coasts (distributional map on discover life). From Fuerteventura (Suárez 2017, this work) activity has been recorded the following months: August, December and January so far