I burn some quaking aspen. It grows abundantly where I live. If it’s green when It was cut/split/stacked I give it a year. It it’s dead standing you can get away with less. Even 6 months depending...of course anything longer just helps that much more.
Welcome to FHC Dead Cutter! I dont burn much aspen even though we have lots of it here. I would like to point out that poplar means different things to some here since poplar in certain regions means tulip poplar. We have a few that burn almost exclusively aspen as youve read from above.