Oh yea poplar will be ready this year for sure with good sun/wind exposure. I love it for shoulder season. Ive had good luck getting cherry, soft maple, and standing dead ash ready in one summer too just top covered. I'm willing to bet pine would also be fine but I've never tried since I live in such a dense hardwood climate.Nice work! The poplar might be ready by the fall if loosely stacked. But I am sure you have other supplies that are burn ready. Either way, nice to be ahead.
Id use more poplar if I had it to save my maple but soft maple makes great should season wood too. Its my most abundant wood (I can see 30+ soft maple out my wind now!) so I use it year round but it excels in shorter burn situations. I mix it with my oak/ash when it gets cold to get more out of it.
If I could only have one log and it was a choice between poplar and a hardwood I'd obviously take the hardwood but I never say no to free poplar! Hmm, or any wood for that matter except pine. Because I'm an addict.