I do not want it up to the pickets but right below them. I dug in some treated 2 x 6 and some of the guys helped me dig in some galvanized steel. I know both will rot away but hopefully not before the weed roots help anchor the dirt.NO NO NO Do not put that dirt up against the pickets on the fence.
It will attract earwigs and ants and beetles and termites to lunch and a home for them and next thing you will need is fence rebuilt.
I had a renter pile dirt against my fence and I reamed him for it. I had my fence on bricks.
Put fence on concrete or bricks off the ground.
You must have a better place to spread that dirt.
If you want to raise the back yard then raise the fence.
I do not want to hear you say in 3 years I need fence on this forum.
That is the nicest way I can say it.
I love a nice wood fence and they can last 20+ years even cheap pine if you do not dirt them in.
Oh and the whole darn neighborhood is already over run with earwigs. We are fighting to keep them out of the house.