i didn't know rattlers climbed anything
I didn't think so either until one October a few years back during archery season. I was helping a guy track his deer when he made a questionable hit.
It was dark and we only found about 2 drops of blood where the deer had originally stood, so we pushed on just looking for anything, and going into a thicket of cedars on a rocky hillside, one of the guys stooped down and went into the brush and we heard a loud yell and the guy came running out like he had run into a swarm of bees.
No bees, but it was a rattlesnake up in the cedar bush limbs about waist high, which in his case was eyeball to eyeball with the snake.
It was a pretty warm night and we called it after the scare, and with little to no sign, put the search off until the morning....Never found the deer.
While dove hunting I walked up on a rattler lying stretched out full length in the shade on top of some thick grass.
The snake never moved as I jumped back almost stepping on the snake because I was watching the trees for birds and looked down just at the last minute, so I assume it was asleep in the cool shade on top of the grass, since it was about 100+ that afternoon.
I know we have snake people here, so I'm not going to say what I did afterward, but I'll just say that 6' rattler won't ever bite anyone.