Is there good cell phone reception at the campground?

I think Verizon is ok

Little to none unless you head back down the mountain

Not at all.

I'm responding to your question from the campsite on my cellphone. I have Verizon.

Verizon works. You have to have a reservation... So make it before you arrive if you are not Verizon! We were there envy of the campground because we had service.