Run In Shed Help

OK I was thinking of building a run in shed for my horse as a summer project and I was wondering if I would have to use cement for the posts?
Or can I just sink them into the ground?

Are you building on a foundation? What sort of ground are you building on? How big will it be? Unless it's going to be VERY large, you don't need to use concrete.

We put up a 12x24 with a center half wall without cement, it's still standing. Just sink the posts below the frost level.

Dig below frost line, say 2 feet or so, then have some gravel, pack a bit of gravel in the bottom of the hole, then use a bit more gravel to get the posts level.

Just keep in mind, when dirt & wood meet, wood will eventually rot, even when encased in concrete. Might take a few years-moisture & Mother Nature will prevail though.

Also have to check building codes, might be additional tax if you put holes in the ground vs building it as a "movable" structure on skids.

My run-in is a moveable building... It's 10x16 and made of rough cut lumber, large cedar logs and metal roofing. The only thing that cost us money was the roofing.

PWF (treated) wood buried in the ground will live much longer than any horses.

What does that kind of wood look like? We had some posts in the ground for a few years and my dad pulled them out and there was no sign of rot.
I'd like to build a round pen sometime with my dad and I need to know what they look like. Thanx!

Did you cut down the trees for the run in shed yourself?