Can I do a dirt floor in a rainy climate?

don't do it!!
i did and i HATE it, i had to put down pallets yesterday

 

Dirt floor in your coop or in your run? You are pretty much guaranteed to have dirt in the run. The chickens will tear the grass up.

Both of my coops have wood floors with about 6" of shavings on top. I stir it every morning and shovel it out about once a month.
My runs are both dirt. I add sand periodically to help with our mud problem. Eventually I want to put about 6" of sand across both runs.

 

The grass will be gone pretty quick.
I have my coop on a cement pad that use to be a dog run. Shavings on that. It cleans up real easy. My run is almost all sand so absorbs alot of wet. Still gets messy after a big snow.

 

If there is anyway that water can seep into the coop I recommend very strongly not having a dirt floor. In the run it's fine because the sun can dry it faster. My coop has a dirt floor, stays muddy and smells awful. We moved recently and I have insisted that the new coop does not have a dirt floor.

 

Yeah, I live in a place like that too.
I highly recommend not having a dirt floor. A lot of moisture comes out of the ground here. It will be so much easier to keep the coop dry and clean with a solid floor that is raised. My first coop sat directly on concrete boards, that worked pretty well, but I had to position boards on the sides to keep water from wicking underneath in the winter. My next coop will have a raised floor with linoleum on it, like our shed. The run will be dirt in no time--I use a thick layer of wood chip and keep most of the run covered. Divert all the water you can away from coop and run (downspouts, etc...)

 

I've found that sand is extremely helpful during our wet periods. I think if you had a dirt floor and put down a good layer of sand, then shavings or whatever you want for bedding on top, it might do well. When I had a run on my coop I filled the run with sand and it worked out great. (Now I just have the coop sitting in the middle of a big pen, took the run off because I got too many chickens to fit in it 24/7!)

 

If the area around the coop has excellent drainage then you may be fine with a slightly raised dirt floor.

If however the soil around the coop tends to be soggy, then as chookchick says you are likely to have a damp humid coop even if the floor is raised above waterline.

In the latter case, if you really want a floor on the ground rather than raised wooden floor, tamping screenings very hard and flat and topping with close-set large concrete pavers would give you a bit drier coop (assuming you have raised this distinctly above grade). But you would have a drier coop yet (meaning not just less prone to flooding, but less humid and unhealthy) with a raised wooden floor, with at least 18" clearance (minimum) above the ground.

For dirt floors, remember chickens tend to dig dusting holes. A dusting hole in a damp area can become a pond, and dusting holes can be pretty hard to fill in again solidly enough that the chickens don't just dig 'em out again.

Good luck, have fun,

Pat