Characters may sometimes have to climb tall objects under duress, perhaps to scale a cliff to attack archers stationed above, or to evade a terrifying creature on the ground below!
No roll is usually needed to ascend ladders, ropes, or trees with lots of limbs unless the GM feels there's a good reason (being chased, wounded, etc.). In more stressful situations, a character makes a Climbing roll and checks the results below. Remember that these measurements are listed in table-top inches, with each inch representing two yards in the real world.
Savage Worlds Deluxe Edition p. 24