Think you can ride all year, but july/August can be pretty hot!
Best to mail and ask.
I’ve been end of April which is great weather but still a bit cold for the pool! And lots of snow at the top of the pass.
Also September which was warmer but not too hot.
I would recommend an enduro/all mountain bike as it’s not all uplift. You need the uphills to work off the massive dinners you eat!
Bolt