We went in october. The view at the top is amazing, but the pools are even better.
The gate was still closed, but the office next to it was open and the lady provided us with a map. We climbed over the gate and started or hike downwards.
Wear good walking shows! It is a difficult hike with a lot of rocks. It took us 40 minutes to go downwards and an hour to go back up with breaks (we are 27/25 years old and quite healthy).
But the Pools downstairs are worth it. You can jump from the cliffs into the water and enjoy nature! The water is cold, but you need that coolness for the way back up.
Bring enough water to drink for the way back up.
You can park at "parking - riserva cavagrande del cassible".
WATCH OUT, FRAUDS ARE STILL ACTIVE. When we drove back, just around the corner there was a car standing still and someone was standing outside. My boyfriend went with a big amount of space around it, but we heard a sound like we hit a rock. When I looked back I noticed that the man was signing that we hit his car (don't know how when the space between our cars was more than 1 meter), then I luckily remembered the other TripAdvisor reviews, so we didn't stop. Thanks TripAdvisor!