If your fence was built of replaced recently here's some useful information.
The wood must "cure" before stain will adhere properly to the fence. (basically `
The fence needs to be cleaned even when dealing with treated lumber
The Moisture content must be below 12% for the stain to fully absorb and create a water barrier.
New wood is easier to stain, partly because it has not been subjected to the elements.
Staining your fence with greatly lengthen your fence's lifespan.