Hi Daniel,
I only know the "old" path, beginning directly on the ridge to kastro summit. In my "early" cretean years I tryed to realise that path in may of various years. I remember, that we turned back 2 or 3 times, some minutes after the point, where you leave the ridge, at the first snow field, because of the risk of crossing the fields. But, i must say, without any equipment and without experiences in similar situations. We are amateurs. And I still know, that on the original path there were no footsteps of other hikers to see. We tryed the crossing without baggage and I remember, it felt not so good (for us) because of the long and steep snow fields in direction of the valley.
Some years later after my first attempt i made it fortunatly

also during may, but without snow.
Normaly in the middle of may you will have there 3 or 4 snowfields, some hundred meters long, ca. 50-100 m wide, steep, that you have to pass on the horizontal E4- path. They begin ca.100 m above the path and end ca. 200 m under the path (depending the winter....).
Later I also heard, as I remember well from Simon and some weeks before also from Jay (Jayhickson....autumn 2025), that you can bypass the fields 100 m above the original E4 (or higher), where the snowfields begin... to reach Kouteli Seli at the end of this passage.
The ridge to Kastro summit itself everytime was free of snow (maybe because off effect of the wind).
By the way, this area is very nice to see from the airport and the port of Souda, from the bus along the northern coast, from the center of chania. You can count the snow-tongues and and you will see, what size the snowfields will have, depending the winter- and springtime before.
Greetings
Frank